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2010s 2015 2boys 2d animated_skeleton ball_gag big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_jacket blue_penis blue_tongue bottom_sans dark_background digital_media_(artwork) duo ectopenis ectotongue elemental_creature elemental_humanoid english_text fire_elemental gay genital_fluids genitals glasses glowing glowing_genitalia glowing_penis grillby grillsans handjob humanoid jacket larger_male male male/male male_only monster monster_boy mouth_gag open_mouth orange_body orgasm_denial penis precum rectangular_eyewear rectangular_glasses saliva sans sans_(undertale) scribble-secrets seme_grillby sitting skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) white_background yaoi
2010s 2015 2boys 2d animated_skeleton ball_gag big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_jacket blue_penis blue_tongue bottom_sans dark_background digital_media_(artwork) duo ectopenis ectotongue elemental_creature elemental_humanoid english_text fire_elemental gay genital_fluids genitals glasses glowing glowing_genitalia glowing_penis grillby grillsans handjob humanoid jacket larger_male male male/male male_only monster monster_boy mouth_gag open_mouth orange_body orgasm_denial penis precum rectangular_eyewear rectangular_glasses saliva sans sans_(undertale) scribble-secrets seme_grillby sitting skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom text tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) white_background yaoi
2010s 2018 2boys animated_skeleton arm_support big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting_lip blue_jacket blue_tongue bottom_sans duo ectotongue elemental_creature elemental_humanoid fellatio fire_elemental grillby grillsans humanoid jacket larger_male legs_apart legs_spread male male/male male_only monster monster_boy orange_body orange_penis penis sans sans_(undertale) seme_grillby sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) video_games weirddworms white_background yaoi
2010s 2018 2boys animated_skeleton arm_support big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting_lip blue_jacket blue_tongue bottom_sans duo ectotongue elemental_creature elemental_humanoid fellatio fire_elemental grillby grillsans humanoid jacket larger_male legs_apart legs_spread male male/male male_only monster monster_boy orange_body orange_penis penis sans sans_(undertale) seme_grillby sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) video_games weirddworms white_background yaoi
2015 2boys 2d animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck artist_name blue_blush blue_eye blue_tongue blush brother/brother brothers digital_media duo ectotongue fontcest gay glowing glowing_eye heart-shaped_pupils heart_eyes humanoid incest intraspecies laddinger making_out male male/male male_only monster monster_boy nude nude_male onomatopoeia orange_blush orange_eye orange_tongue papyrus_(undertale) papysans ribs sans_(undertale) sibling_incest siblings simple_background skeleton sweat teeth text undead undertale undertale_(series) upper_body watermark white_background yaoi
2015 2boys 2d animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck artist_name blue_blush blue_eye blue_tongue blush brother/brother brothers digital_media duo ectotongue fontcest gay glowing glowing_eye heart-shaped_pupils heart_eyes humanoid incest intraspecies laddinger making_out male male/male male_only monster monster_boy nude nude_male onomatopoeia orange_blush orange_eye orange_tongue papyrus_(undertale) papysans ribs sans_(undertale) sibling_incest siblings simple_background skeleton sweat teeth text undead undertale undertale_(series) upper_body watermark white_background yaoi
2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_jacket blue_slippers blue_tongue bottom_sans cussing digital_media_(artwork) double_v duo ectotongue elemental_creature elemental_humanoid english_text fire_elemental grillby grillsans humanoid jacket larger_male legs_apart legs_held_open legs_spread legs_up male male_only male_penetrating moaning monster monster_boy neetnest orange_body orange_penis penetration penis profanity sans sans_(undertale) seme_grillby sex skeleton slippers small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom swearing text tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) v v_sign video_games white_background yaoi
2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_jacket blue_slippers blue_tongue bottom_sans cussing digital_media_(artwork) double_v duo ectotongue elemental_creature elemental_humanoid english_text fire_elemental grillby grillsans humanoid jacket larger_male legs_apart legs_held_open legs_spread legs_up male male_only male_penetrating moaning monster monster_boy neetnest orange_body orange_penis penetration penis profanity sans sans_(undertale) seme_grillby sex skeleton slippers small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom swearing text tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) v v_sign video_games white_background yaoi
2018 2boys 2d anal animated_skeleton bad_id bad_tumblr_id bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_tongue blush bottom_sans completely_nude completely_nude_male dark_background digital_media duo elemental_creature fire_elemental from_front_position gay grillby grillsans heart-shaped_pupils humanoid indoors interspecies larger_male larger_penetrating larger_penetrating_smaller legs_over_partner's_shoulders legs_over_shoulders legs_up male male/male male_only male_penetrating melle-d missionary_position monster monster_boy muscular muscular_male nude nude_male orange_body penetration sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tongue tongue_out top_grillby undead undertale undertale_(series) yaoi
2018 2boys 2d anal animated_skeleton bad_id bad_tumblr_id bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_tongue blush bottom_sans completely_nude completely_nude_male dark_background digital_media duo elemental_creature fire_elemental from_front_position gay grillby grillsans heart-shaped_pupils humanoid indoors interspecies larger_male larger_penetrating larger_penetrating_smaller legs_over_partner's_shoulders legs_over_shoulders legs_up male male/male male_only male_penetrating melle-d missionary_position monster monster_boy muscular muscular_male nude nude_male orange_body penetration sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tongue tongue_out top_grillby undead undertale undertale_(series) yaoi
2018 2boys 2d animated_skeleton bad_id bad_tumblr_id bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_tongue blush bottom_sans dark_background digital_media duo elemental_creature elemental_humanoid fire_elemental gay grillby grillsans heart-shaped_pupils heart_eyes hugging humanoid indoors interspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating melle-d monster monster_boy muscular muscular_male nude nude_male orange_body penetration sans_(undertale) sex sitting sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tongue tongue_out top_grillby undead undertale undertale_(series) yaoi
2018 2boys 2d animated_skeleton bad_id bad_tumblr_id bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_tongue blush bottom_sans dark_background digital_media duo elemental_creature elemental_humanoid fire_elemental gay grillby grillsans heart-shaped_pupils heart_eyes hugging humanoid indoors interspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating melle-d monster monster_boy muscular muscular_male nude nude_male orange_body penetration sans_(undertale) sex sitting sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tongue tongue_out top_grillby undead undertale undertale_(series) yaoi
2020s 2021 2boys 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans digital_media_(artwork) drooling duo ectotongue elemental_creature elemental_humanoid english_text fire_elemental grillby grillsans heart-shaped_pupils heart_eyes humanoid male male_only male_penetrating moaning monster monster_boy orange_penis partial_male penetration penis phone phone_screen sans sans_(undertale) seme_grillby sex skeleton skllkndy smartphone solo_focus speech_bubble tears tears_of_pleasure text tongue tongue_out top_grillby twitter uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2021 2boys 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans digital_media_(artwork) drooling duo ectotongue elemental_creature elemental_humanoid english_text fire_elemental grillby grillsans heart-shaped_pupils heart_eyes humanoid male male_only male_penetrating moaning monster monster_boy orange_penis partial_male penetration penis phone phone_screen sans sans_(undertale) seme_grillby sex skeleton skllkndy smartphone solo_focus speech_bubble tears tears_of_pleasure text tongue tongue_out top_grillby twitter uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1boy 1cuntboy 2021 2d abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother/brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie humanoid inactive_account incest intraspecies jacket kneeling looking_back male maledom monster papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans_(undertale) sibling_incest siblings skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
1boy 1cuntboy 2021 2d abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother/brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie humanoid inactive_account incest intraspecies jacket kneeling looking_back male maledom monster papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans_(undertale) sibling_incest siblings skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
>:o 2021 2d abosinsin anger_vein angry animated_skeleton apron bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brothers cussing digital_media duo english_text fontcest gloves grabbing_another's_chin grabbing_face height_difference hooded_jacket hoodie humanoid implied_incest inactive_account indoors jacket larger_male male monster orange_apron papyrus_(undertale) papysans profanity red_gloves red_sweater sans_(undertale) siblings skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing sweat sweater text top_papyrus twitter_username undead undertale undertale_(series) video_game_character video_games yaoi
>:o 2021 2d abosinsin anger_vein angry animated_skeleton apron bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brothers cussing digital_media duo english_text fontcest gloves grabbing_another's_chin grabbing_face height_difference hooded_jacket hoodie humanoid implied_incest inactive_account indoors jacket larger_male male monster orange_apron papyrus_(undertale) papysans profanity red_gloves red_sweater sans_(undertale) siblings skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing sweat sweater text top_papyrus twitter_username undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) doggy_position duo ectoplasm finger_in_mouth fingers_in_mouth fontcest from_behind_position grabbing_from_behind grey_background incest intraspecies larger_male larger_penetrating male male/male male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy off_shoulder orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) doggy_position duo ectoplasm finger_in_mouth fingers_in_mouth fontcest from_behind_position grabbing_from_behind grey_background incest intraspecies larger_male larger_penetrating male male/male male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy off_shoulder orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
2010s 2018 2boys animated_skeleton blue_blush blue_tongue bottom_sans brother/brother brothers clothed dominant_pov duo ectotongue fontcest gay gloves grabbing_hand grabbing_mouth hooded_jacket hoodie incest jacket male male/male male_only male_pov monster papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus simple_background skeleton solo_focus submissive top_papyrus uke_sans undead undertale undertale_(series) upper_body veah-3sin yaoi
2010s 2018 2boys animated_skeleton blue_blush blue_tongue bottom_sans brother/brother brothers clothed dominant_pov duo ectotongue fontcest gay gloves grabbing_hand grabbing_mouth hooded_jacket hoodie incest jacket male male/male male_only male_pov monster papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus simple_background skeleton solo_focus submissive top_papyrus uke_sans undead undertale undertale_(series) upper_body veah-3sin yaoi
1boy 2010s 2016 ahegao animated_skeleton blue_tongue bottom_sans clothed ectopenis english_text hand_on_own_face heart-shaped_pupils heart_eyes imminent_cum imminent_ejaculation imminent_orgasm male male_ahegao male_masturbation male_only masturbation moaning monochrome monster neetnest partially_colored penile_masturbation penis sans sans_(undertale) skeleton solo solo_male text text_bubble tongue tongue_out tumblr uke_sans undead undertale undertale_(series) white_background
1boy 2010s 2016 ahegao animated_skeleton blue_tongue bottom_sans clothed ectopenis english_text hand_on_own_face heart-shaped_pupils heart_eyes imminent_cum imminent_ejaculation imminent_orgasm male male_ahegao male_masturbation male_only masturbation moaning monochrome monster neetnest partially_colored penile_masturbation penis sans sans_(undertale) skeleton solo solo_male text text_bubble tongue tongue_out tumblr uke_sans undead undertale undertale_(series) white_background
1boy 2010s alternate_background alternate_version_available animated_skeleton art_trade blue_tongue bottom_sans clothed heart-shaped_pupils heart_eyes joah_(artist) male male_only moaning monster one_eye_closed sans sans_(undertale) skeleton solo solo_male submissive tentacle tentacle_on_male tentacles_on_male tongue tongue_out uke_sans undead undertale undertale_(series) white_background
1boy 2010s alternate_background alternate_version_available animated_skeleton art_trade blue_tongue bottom_sans clothed heart-shaped_pupils heart_eyes joah_(artist) male male_only moaning monster one_eye_closed sans sans_(undertale) skeleton solo solo_male submissive tentacle tentacle_on_male tentacles_on_male tongue tongue_out uke_sans undead undertale undertale_(series) white_background
1boy 2010s alternate_version_available animated_skeleton art_trade blue_tongue bottom_sans ectotongue heart-shaped_pupils heart_eyes joah_(artist) male male_only moaning monster one_eye_closed sans sans_(undertale) skeleton solo_male submissive tentacle tentacle_on_male tentacles_on_male tongue tongue_out uke_sans undead undertale undertale_(series)
1boy 2010s alternate_version_available animated_skeleton art_trade blue_tongue bottom_sans ectotongue heart-shaped_pupils heart_eyes joah_(artist) male male_only moaning monster one_eye_closed sans sans_(undertale) skeleton solo_male submissive tentacle tentacle_on_male tentacles_on_male tongue tongue_out uke_sans undead undertale undertale_(series)
2boys 2d ahegao animated_skeleton artist_request blue_tongue blush bottom_sans crying_with_eyes_open digital_media dominant_pov english_text fangs hands hands_behind_head male male/male male_ahegao male_focus male_only moan monster multiple_hands pleasure_face pov sans_(undertale) sanster skeleton solo_focus text tongue tongue_out top_gaster undead undertale undertale_(series) video_games w.d._gaster yaoi
2boys 2d ahegao animated_skeleton artist_request blue_tongue blush bottom_sans crying_with_eyes_open digital_media dominant_pov english_text fangs hands hands_behind_head male male/male male_ahegao male_focus male_only moan monster multiple_hands pleasure_face pov sans_(undertale) sanster skeleton solo_focus text tongue tongue_out top_gaster undead undertale undertale_(series) video_games w.d._gaster yaoi
animated_skeleton back_view blue_blush blue_eyes blue_tongue blush bottom_sans bottomless bound_arms bound_wrists drooling ectotongue gag kneel male_only monster mouth_gag multiple_views naked nude open_mouth partially_colored sans sans_(undertale) skeleton solo tied_up tied_wrists tongue tongue_out uke_sans undead undertale undertale_(series) unknown_artist white_background
animated_skeleton back_view blue_blush blue_eyes blue_tongue blush bottom_sans bottomless bound_arms bound_wrists drooling ectotongue gag kneel male_only monster mouth_gag multiple_views naked nude open_mouth partially_colored sans sans_(undertale) skeleton solo tied_up tied_wrists tongue tongue_out uke_sans undead undertale undertale_(series) unknown_artist white_background
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton anon anonymous anonymous_male blue_tongue bone bottom_sans digital_media_(artwork) disembodied_penis duo genitals grey_background licking licking_penis male male/male male_only nubs oral penis safetytrance sans sans_(undertale) sex simple_background skeleton solid_color_background solo_focus text third-party_source tongue uke_sans undead undertale undertale_(series) unseen_character unseen_male_face video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton anon anonymous anonymous_male blue_tongue bone bottom_sans digital_media_(artwork) disembodied_penis duo genitals grey_background licking licking_penis male male/male male_only nubs oral penis safetytrance sans sans_(undertale) sex simple_background skeleton solid_color_background solo_focus text third-party_source tongue uke_sans undead undertale undertale_(series) unseen_character unseen_male_face video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 animated_skeleton blue_blush blue_tongue blush bottom_sans bound bound_arms chain_leash chained_arms chained_collar chains clothed collar crying drool ectotongue korean_text monochrome monster non-con non-consensual noncon nonconsensual peng2_(artist) peng2_undertale_(artist) restrained restraints sans sans_(undertale) skeleton solo solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) visible_breath white_background
1:1 1:1_aspect_ratio 2010s 2017 animated_skeleton blue_blush blue_tongue blush bottom_sans bound bound_arms chain_leash chained_arms chained_collar chains clothed collar crying drool ectotongue korean_text monochrome monster non-con non-consensual noncon nonconsensual peng2_(artist) peng2_undertale_(artist) restrained restraints sans sans_(undertale) skeleton solo solo_focus submissive sweat tears text uke_sans undead undertale undertale_(series) visible_breath white_background
2010s 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_tongue blush bottom_sans bottomless bottomless_male clothed duo ectotongue elemental_creature elemental_humanoid fire_elemental gay grillby grillsans humanoid ladybumtickler larger_male larger_penetrating larger_penetrating_smaller male male/male male_only monster monster_boy orange_body orange_penis partially_clothed partially_clothed_male penis sans sans_(undertale) seme_grillby sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sniggysmut third-party_source top_grillby uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_tongue blush bottom_sans bottomless bottomless_male clothed duo ectotongue elemental_creature elemental_humanoid fire_elemental gay grillby grillsans humanoid ladybumtickler larger_male larger_penetrating larger_penetrating_smaller male male/male male_only monster monster_boy orange_body orange_penis partially_clothed partially_clothed_male penis sans sans_(undertale) seme_grillby sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sniggysmut third-party_source top_grillby uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton blue_tongue blush bottom_sans clothed clothed/nude clothed_male duo ectotongue elemental_creature elemental_humanoid fellatio fire_elemental genitals grillby grillsans humanoid ladybumtickler licking licking_penis male male/male male_only monster monster_boy nude nude_male oral orange_body orange_penis penis sans sans_(undertale) seme_grillby simple_background skeleton sniggysmut third-party_source top_grillby uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton blue_tongue blush bottom_sans clothed clothed/nude clothed_male duo ectotongue elemental_creature elemental_humanoid fellatio fire_elemental genitals grillby grillsans humanoid ladybumtickler licking licking_penis male male/male male_only monster monster_boy nude nude_male oral orange_body orange_penis penis sans sans_(undertale) seme_grillby simple_background skeleton sniggysmut third-party_source top_grillby uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_name big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis blue_tongue blush bonetrouble bottom_sans brother brother/brother brother_and_brother brothers clothed_male crying drawn drooling erection erection_under_clothes fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_name big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis blue_tongue blush bonetrouble bottom_sans brother brother/brother brother_and_brother brothers clothed_male crying drawn drooling erection erection_under_clothes fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bottom_sans clothed cussing digital_media_(artwork) drooling eye_fucking eye_penetration heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket male male_focus male_only malesub monster penis_in_eye profanity sans sans_(undertale) skeleton skull_fucking solo_focus submissive submissive_male swearing text tongue tongue_out uke_sans undead undertale undertale_(series) unknown_artist unseen_male unseen_male_face upper_body video_game_character video_games visible_breath white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bottom_sans clothed cussing digital_media_(artwork) drooling eye_fucking eye_penetration heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket male male_focus male_only malesub monster penis_in_eye profanity sans sans_(undertale) skeleton skull_fucking solo_focus submissive submissive_male swearing text tongue tongue_out uke_sans undead undertale undertale_(series) unknown_artist unseen_male unseen_male_face upper_body video_game_character video_games visible_breath white_background yaoi
animated_skeleton artist_request blue_background blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans clothed gaster_blaster hooded_jacket hoodie jacket larger_penetrating larger_penetrating_smaller licking long_tongue male male_penetrated monster penetration saliva sans sans_(undertale) simple_background size_difference skeleton smaller_penetrated solid_color_background solo_focus submissive submissive_male tongue tongue_fuck tongue_fucking tongue_out tongue_penetration uke_sans undead undertale undertale_(series) wet
animated_skeleton artist_request blue_background blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans clothed gaster_blaster hooded_jacket hoodie jacket larger_penetrating larger_penetrating_smaller licking long_tongue male male_penetrated monster penetration saliva sans sans_(undertale) simple_background size_difference skeleton smaller_penetrated solid_color_background solo_focus submissive submissive_male tongue tongue_fuck tongue_fucking tongue_out tongue_penetration uke_sans undead undertale undertale_(series) wet
2boys 2d 2d_(artwork) ahegao animated_skeleton black_background blue_background blue_eyes blue_tongue bondage bone bottom_sans clothed clothing degradation digital_media_(artwork) drooling duo ectopenis ectotongue english english_text erection fangs flora_fauna flower flowey_the_flower fucked_silly glowing glowing_eye glowing_eyes high_res humanoid_penis jacket looking_pleasured male male/male male_ahegao male_only moan monster naughty_face nsfwchubbybunnie open_mouth orgasm penis plant restrained saliva saliva_string saliva_trail sans sans_(undertale) seme_flowey sex signature simple_background skeleton skull speech_bubble spikes sweat teeth tentacle tentaclejob text text_bubble third-party_source tongue tongue_out top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vinejob vines yaoi
2boys 2d 2d_(artwork) ahegao animated_skeleton black_background blue_background blue_eyes blue_tongue bondage bone bottom_sans clothed clothing degradation digital_media_(artwork) drooling duo ectopenis ectotongue english english_text erection fangs flora_fauna flower flowey_the_flower fucked_silly glowing glowing_eye glowing_eyes high_res humanoid_penis jacket looking_pleasured male male/male male_ahegao male_only moan monster naughty_face nsfwchubbybunnie open_mouth orgasm penis plant restrained saliva saliva_string saliva_trail sans sans_(undertale) seme_flowey sex signature simple_background skeleton skull speech_bubble spikes sweat teeth tentacle tentaclejob text text_bubble third-party_source tongue tongue_out top_flowey uke_sans undead undertale undertale_(series) video_game_character video_games vinejob vines yaoi
1girl 2022 anthro areola avian azura_(azura_inalis) azura_inalis beak bird blue_areola blue_body blue_clitoris blue_jay blue_mouth blue_nipples blue_pussy blue_tongue clitoris clitoris_piercing clitoris_ring collar collar_only corvid erect_clitoris feathers female female_only fluffy fluffy_tail fox_tail genital_piercing genitals high_res hybrid jay_(bird) new_world_jay nipples nude original oscine passerine piercing puffy_nipples pussy pussy_piercing pussy_ring ring_piercing tail tattoo tongue
1girl 2022 anthro areola avian azura_(azura_inalis) azura_inalis beak bird blue_areola blue_body blue_clitoris blue_jay blue_mouth blue_nipples blue_pussy blue_tongue clitoris clitoris_piercing clitoris_ring collar collar_only corvid erect_clitoris feathers female female_only fluffy fluffy_tail fox_tail genital_piercing genitals high_res hybrid jay_(bird) new_world_jay nipples nude original oscine passerine piercing puffy_nipples pussy pussy_piercing pussy_ring ring_piercing tail tattoo tongue
2010s 2016 2boys 2d 2d_(artwork) ahoge animated_skeleton blue_blush blue_tongue blush boots bottom_sans crying drooling fangs hair high_heel_boots hooded_jacket hoodie humanoid humanoid_robot jacket licking_tongue making_out male male/male male_only mettasans mettaton mettaton_ex monster partially_colored robot robot_boy robot_humanoid sans sans_(undertale) skeleton sketch sweat tears tongue tongue_out trembling tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) ahoge animated_skeleton blue_blush blue_tongue blush boots bottom_sans crying drooling fangs hair high_heel_boots hooded_jacket hoodie humanoid humanoid_robot jacket licking_tongue making_out male male/male male_only mettasans mettaton mettaton_ex monster partially_colored robot robot_boy robot_humanoid sans sans_(undertale) skeleton sketch sweat tears tongue tongue_out trembling tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots bottom_sans box digital_media_(artwork) dominant dominant_male domination english_text footwear glowing_eyes hair hair_over_one_eye high_heel_boots humanoid humanoid_robot larger_male licking licking_leg male male/male male_only maledom malesub mettasans mettaton mettaton_ex monster nude nude_male penis pink_boots pink_eyes pink_glans pink_high_heel_boots pink_tongue robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton shoes simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male text tongue top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots bottom_sans box digital_media_(artwork) dominant dominant_male domination english_text footwear glowing_eyes hair hair_over_one_eye high_heel_boots humanoid humanoid_robot larger_male licking licking_leg male male/male male_only maledom malesub mettasans mettaton mettaton_ex monster nude nude_male penis pink_boots pink_eyes pink_glans pink_high_heel_boots pink_tongue robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton shoes simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male text tongue top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1boy 2d 2d_(artwork) animated_skeleton arm_support artist_name blue_blush blue_penis blue_tongue blush clothed clothed_male digital_media_(artwork) ectopenis genital_fluids genitals hand_on_floor kneel looking_pleasured male male_masturbation male_only masturbation monster monster_boy penile_masturbation penis sans sans_(undertale) simple_background sinningskeletontrash skeleton solo_male tongue tongue_out tumblr undead undertale undertale_(series) video_game_character video_games white_background
1boy 2d 2d_(artwork) animated_skeleton arm_support artist_name blue_blush blue_penis blue_tongue blush clothed clothed_male digital_media_(artwork) ectopenis genital_fluids genitals hand_on_floor kneel looking_pleasured male male_masturbation male_only masturbation monster monster_boy penile_masturbation penis sans sans_(undertale) simple_background sinningskeletontrash skeleton solo_male tongue tongue_out tumblr undead undertale undertale_(series) video_game_character video_games white_background
1boy 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_cum blue_eyes blue_penis blue_tongue blush covering_one_eye cum cum_on_body cum_on_self digital_media_(artwork) dinogirl69 ectopenis fangs genital_fluids genitals glowing glowing_genitalia glowing_penis grabbing_own_penis humanoid lying_down lying_on_back lying_on_bed male male_masturbation male_only masturbation monster monster_boy nude nude_male on_back penile penile_masturbation penis sans sans_(undertale) skeleton solo_male third-party_source undead undertale undertale_(series) video_game_character video_games visible_breath
1boy 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_cum blue_eyes blue_penis blue_tongue blush covering_one_eye cum cum_on_body cum_on_self digital_media_(artwork) dinogirl69 ectopenis fangs genital_fluids genitals glowing glowing_genitalia glowing_penis grabbing_own_penis humanoid lying_down lying_on_back lying_on_bed male male_masturbation male_only masturbation monster monster_boy nude nude_male on_back penile penile_masturbation penis sans sans_(undertale) skeleton solo_male third-party_source undead undertale undertale_(series) video_game_character video_games visible_breath
1boy 2d 2d_(artwork) animated_skeleton balls bed blue_blush blue_hoodie blue_jacket blue_penis blue_tongue blush bone chaotic-time clothed clothing digital_media_(artwork) ectopenis erection genitals glowing hooded_jacket hoodie humanoid_penis jacket legs_apart lying_on_bed male male_only monster monster_boy on_bed penis penis_out pillow saliva sans sans_(undertale) shirt_pulled_up shirt_up skeleton solo_male spread_legs submissive testicles tongue tongue_out undead undertale undertale_(series) video_game_character video_games
1boy 2d 2d_(artwork) animated_skeleton balls bed blue_blush blue_hoodie blue_jacket blue_penis blue_tongue blush bone chaotic-time clothed clothing digital_media_(artwork) ectopenis erection genitals glowing hooded_jacket hoodie humanoid_penis jacket legs_apart lying_on_bed male male_only monster monster_boy on_bed penis penis_out pillow saliva sans sans_(undertale) shirt_pulled_up shirt_up skeleton solo_male spread_legs submissive testicles tongue tongue_out undead undertale undertale_(series) video_game_character video_games
1boy 2d 2d_(artwork) animated_skeleton blue_blush blue_eye blue_eyes blue_hoodie blue_jacket blue_penis blue_tongue blush blushing clothed clothed_male clothing digital_media_(artwork) ectopenis fully_clothed grabbing_own_penis hooded_jacket hoodie jacket looking_at_viewer male male_masturbation male_only masturbation monster one_eye_closed penile_masturbation penis penis_out sans sans_(undertale) serfuzzy skeleton solo solo_male third-party_source transparent_background undead undertale undertale_(series) video_games
1boy 2d 2d_(artwork) animated_skeleton blue_blush blue_eye blue_eyes blue_hoodie blue_jacket blue_penis blue_tongue blush blushing clothed clothed_male clothing digital_media_(artwork) ectopenis fully_clothed grabbing_own_penis hooded_jacket hoodie jacket looking_at_viewer male male_masturbation male_only masturbation monster one_eye_closed penile_masturbation penis penis_out sans sans_(undertale) serfuzzy skeleton solo solo_male third-party_source transparent_background undead undertale undertale_(series) video_games
1boy 2020s 2021 2d 2d_(artwork) ahegao animated_skeleton blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blue_testicles blue_tongue blush blushing bottom_sans chubby chubby_male clothed crying cum cum_on_face cumming digital_media_(artwork) ectobody ectopenis gripping_sheets hole_in_pants hooded_jacket hoodie jacket male male_ahegao male_only monster on_bed one_eye_closed penis sans sans_(undertale) shirt shorts skeleton solo solo_male sweating tears testicles tongue_out trembling uke_sans undead undertale undertale_(series) unknown_artist veiny_penis video_games
1boy 2020s 2021 2d 2d_(artwork) ahegao animated_skeleton blue_belly blue_blush blue_body blue_hoodie blue_jacket blue_penis blue_testicles blue_tongue blush blushing bottom_sans chubby chubby_male clothed crying cum cum_on_face cumming digital_media_(artwork) ectobody ectopenis gripping_sheets hole_in_pants hooded_jacket hoodie jacket male male_ahegao male_only monster on_bed one_eye_closed penis sans sans_(undertale) shirt shorts skeleton solo solo_male sweating tears testicles tongue_out trembling uke_sans undead undertale undertale_(series) unknown_artist veiny_penis video_games
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) 3boys ahegao animated_skeleton assisted_fellatio assisted_sex blue_tongue bondage bottom_sans bound brother_penetrating_brother brothers cum cum_in_mouth cum_on_face cum_on_tongue digital_media_(artwork) ectopenis flowans flowey_the_flower flowsans fontcest goopynoms incest male male/male male/male/male male_only male_penetrating monochrome monster mouth_forced_open orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sex skeleton tongue_out top_papyrus trio uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) 3boys ahegao animated_skeleton assisted_fellatio assisted_sex blue_tongue bondage bottom_sans bound brother_penetrating_brother brothers cum cum_in_mouth cum_on_face cum_on_tongue digital_media_(artwork) ectopenis flowans flowey_the_flower flowsans fontcest goopynoms incest male male/male male/male/male male_only male_penetrating monochrome monster mouth_forced_open orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sex skeleton tongue_out top_papyrus trio uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) 3boys animated_skeleton assisted_fellatio assisted_sex blue_penis blue_tongue bondage bottom_sans bound brothers digital_media_(artwork) ectopenis flowans flowey_the_flower flowsans fontcest gay genitals goopynoms imminent_fellatio imminent_oral incest male male/male male_only monochrome monster mouth_forced_open orange_penis papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus skeleton tongue_out top_papyrus trio uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) 3boys animated_skeleton assisted_fellatio assisted_sex blue_penis blue_tongue bondage bottom_sans bound brothers digital_media_(artwork) ectopenis flowans flowey_the_flower flowsans fontcest gay genitals goopynoms imminent_fellatio imminent_oral incest male male/male male_only monochrome monster mouth_forced_open orange_penis papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus skeleton tongue_out top_papyrus trio uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) 3boys ahegao animated_skeleton assisted_fellatio assisted_sex blue_tongue bondage bottom_sans bound brother_penetrating_brother brothers cum cum_in_mouth cum_on_face cum_on_tongue digital_media_(artwork) ectopenis flowans flowey_the_flower flowsans fontcest gay genitals goopynoms incest male male/male male/male/male male_only male_penetrating monochrome monster mouth_forced_open orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sex skeleton tongue_out top_papyrus trio uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2015 2d 2d_(artwork) 3boys ahegao animated_skeleton assisted_fellatio assisted_sex blue_tongue bondage bottom_sans bound brother_penetrating_brother brothers cum cum_in_mouth cum_on_face cum_on_tongue digital_media_(artwork) ectopenis flowans flowey_the_flower flowsans fontcest gay genitals goopynoms incest male male/male male/male/male male_only male_penetrating monochrome monster mouth_forced_open orange_cum orange_penis papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sex skeleton tongue_out top_papyrus trio uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi