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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 goopynoms imminent_fellatio incest male male/male male/male/male male_only monochrome monster mouth_forced_open 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 goopynoms imminent_fellatio incest male male/male male/male/male male_only monochrome monster mouth_forced_open 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 2boys 2d animated_skeleton blue_blush blue_tongue bottom_sans daron9 digital_media fur_trim implied_penetration implied_sex korean_text male male_focus male_only monster sans_(undertale) sanster seme_gaster skeleton solo_focus text tongue tongue_out top_gaster uke_sans undead undertale undertale_(series) unseen_male_face video_games w.d._gaster yaoi
1:1 1:1_aspect_ratio 2boys 2d animated_skeleton blue_blush blue_tongue bottom_sans daron9 digital_media fur_trim implied_penetration implied_sex korean_text male male_focus male_only monster sans_(undertale) sanster seme_gaster skeleton solo_focus text tongue tongue_out top_gaster uke_sans undead undertale undertale_(series) unseen_male_face video_games w.d._gaster yaoi
1:1 1:1_aspect_ratio 2016 2d 2d_(artwork) animated_skeleton anon anonymous_male artist_name blue_blush blue_tongue blush bottom_sans clothed cockotron digital_media_(artwork) faceless_male fellatio fellatio_pov fvdsfs genitals licking licking_penis long_tongue male male_pov monster oral penis penis_in_mouth pink_sweater pov sans sans_(undertale) sex simple_background skeleton solo_focus sweat sweater third-party_source tongue uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_games white_background
1:1 1:1_aspect_ratio 2016 2d 2d_(artwork) animated_skeleton anon anonymous_male artist_name blue_blush blue_tongue blush bottom_sans clothed cockotron digital_media_(artwork) faceless_male fellatio fellatio_pov fvdsfs genitals licking licking_penis long_tongue male male_pov monster oral penis penis_in_mouth pink_sweater pov sans sans_(undertale) sex simple_background skeleton solo_focus sweat sweater third-party_source tongue uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_games white_background
1boy 1girl aoi_k3 bigger_male blue_tongue blush chubby_male darkner deltarune deltarune_chapter_1 deltarune_chapter_2 female handjob hi_res high_res highres king_spade larger_male male male/female missionary_position queen_(deltarune) sex simple_background smaller_female solid_color_background stomach_mouth straight sucking_nipples undertale_(series) undressing undressing_another undressing_partner
1boy 1girl aoi_k3 bigger_male blue_tongue blush chubby_male darkner deltarune deltarune_chapter_1 deltarune_chapter_2 female handjob hi_res high_res highres king_spade larger_male male male/female missionary_position queen_(deltarune) sex simple_background smaller_female solid_color_background stomach_mouth straight sucking_nipples undertale_(series) undressing undressing_another undressing_partner
1boy anthro balls belly big_belly blue_nipples blue_tongue bodily_fluids bottomwear clothed clothing darkner deltarune deltarune_chapter_1 fishnet_legwear fishnet_stockings fishnet_thighhighs flaccid genitals grey_background high_res hood humanoid king_spade male male/male male_only mature_anthro mature_male monster moobs nipples overweight overweight_male partially_clothed penis simple_background slightly_chubby smut_leo solid_color_background solo solo_male sweat tongue_out undertale_(series) video_games white_body
1boy anthro balls belly big_belly blue_nipples blue_tongue bodily_fluids bottomwear clothed clothing darkner deltarune deltarune_chapter_1 fishnet_legwear fishnet_stockings fishnet_thighhighs flaccid genitals grey_background high_res hood humanoid king_spade male male/male male_only mature_anthro mature_male monster moobs nipples overweight overweight_male partially_clothed penis simple_background slightly_chubby smut_leo solid_color_background solo solo_male sweat tongue_out undertale_(series) video_games white_body
1boy 2010s 2018 aliasing anal anal_masturbation autoanilingus autorimjob balls belly big_belly biped blue_balls blue_body blue_glans blue_penis blue_testicles blue_tongue clothing colored_sketch crown darkner deltarune deltarune_chapter_1 dr-sawboners drooling erection eyeless first_porn_of_character footwear front_view frown glans grey_background hand_on_leg humanoid humanoid_penis king king_spade long_tongue looking_pleasured male male_only masturbation moobs mostly_nude open_frown open_mouth open_smile oral overweight overweight_male penis plantigrade precum raised_leg reclining rimjob royalty saliva sharp_teeth shoes signature simple_background sitting smile solo solo_male spade stomach_mouth suit_symbol sweat teeth testicle testicles tongue tongue_out two_tone_body undertale_(series) veins veiny_penis video_games white_body white_tongue
1boy 2010s 2018 aliasing anal anal_masturbation autoanilingus autorimjob balls belly big_belly biped blue_balls blue_body blue_glans blue_penis blue_testicles blue_tongue clothing colored_sketch crown darkner deltarune deltarune_chapter_1 dr-sawboners drooling erection eyeless first_porn_of_character footwear front_view frown glans grey_background hand_on_leg humanoid humanoid_penis king king_spade long_tongue looking_pleasured male male_only masturbation moobs mostly_nude open_frown open_mouth open_smile oral overweight overweight_male penis plantigrade precum raised_leg reclining rimjob royalty saliva sharp_teeth shoes signature simple_background sitting smile solo solo_male spade stomach_mouth suit_symbol sweat teeth testicle testicles tongue tongue_out two_tone_body undertale_(series) veins veiny_penis video_games white_body white_tongue
2010s 2d 2d_(artwork) anal animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers comic digital_media_(artwork) duo ectopenis eli-sin-g english_text fingers_interlocked fontcest hypnotized incest interlocked_fingers intertwined_fingers intraspecies kolesjoie male mind_control monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton sweat text tongue tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2d 2d_(artwork) anal animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers comic digital_media_(artwork) duo ectopenis eli-sin-g english_text fingers_interlocked fontcest hypnotized incest interlocked_fingers intertwined_fingers intraspecies kolesjoie male mind_control monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton sweat text tongue tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s animated_skeleton blue_blush blue_tongue blush bottom_sans bouncing_penis brother brother/brother brother_and_brother brothers comic cum cum_in_mouth eli-sin-g english_text fellatio fontcest hypnotized incest intraspecies irrumatio kolesjoie male mind_control monster monster_boy papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton swallowing_cum text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) yaoi
2010s animated_skeleton blue_blush blue_tongue blush bottom_sans bouncing_penis brother brother/brother brother_and_brother brothers comic cum cum_in_mouth eli-sin-g english_text fellatio fontcest hypnotized incest intraspecies irrumatio kolesjoie male mind_control monster monster_boy papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sequence sequential sibling_incest siblings skeleton swallowing_cum text tongue top_papyrus tumblr uke_sans undead undertale undertale_(series) yaoi
2022 2boys 2d anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_tongue bodily_fluids boner_blossom bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers crying crying_with_eyes_open digital_media drooling duo ectopenis ectoplasm english_text fluids fontcest gay heart-shaped_pupils humanoid incest intraspecies larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male missionary_position monster monster_boy non-con non-consensual noncon nonconsensual nude nude_male orange_penis papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis questionable_consent rape safeword sans_(undertale) sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble sweat tears text text_bubble thrusting tongue top_papyrus twitter_username undead undertale undertale_(series) video_game_character video_games yaoi
2022 2boys 2d anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_tongue bodily_fluids boner_blossom bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers crying crying_with_eyes_open digital_media drooling duo ectopenis ectoplasm english_text fluids fontcest gay heart-shaped_pupils humanoid incest intraspecies larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male missionary_position monster monster_boy non-con non-consensual noncon nonconsensual nude nude_male orange_penis papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis questionable_consent rape safeword sans_(undertale) sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble sweat tears text text_bubble thrusting tongue top_papyrus twitter_username undead undertale undertale_(series) video_game_character video_games yaoi
2018 animated_skeleton blue_blush blue_eyes blue_tongue bondage bottom_sans bound_arms bound_legs headogs heart-shaped_pupils heart_eyes looking_at_viewer monster nude sans sans_(undertale) sex skeleton solo submissive tied_up tongue tongue_out uke_sans undead undertale undertale_(series)
2018 animated_skeleton blue_blush blue_eyes blue_tongue bondage bottom_sans bound_arms bound_legs headogs heart-shaped_pupils heart_eyes looking_at_viewer monster nude sans sans_(undertale) sex skeleton solo submissive tied_up tongue tongue_out uke_sans undead undertale undertale_(series)
2018 animated_skeleton blue_blush blue_eyes blue_tongue bottom_sans clothed headogs heart-shaped_pupils heart_eyes male monster orange_penis penetration penis sans sans_(undertale) sex skeleton solo_focus submissive tongue tongue_out uke_sans undead undertale undertale_(series)
2018 animated_skeleton blue_blush blue_eyes blue_tongue bottom_sans clothed headogs heart-shaped_pupils heart_eyes male monster orange_penis penetration penis sans sans_(undertale) sex skeleton solo_focus submissive tongue tongue_out uke_sans undead undertale undertale_(series)
2016 2boys 2d animated_skeleton artist_name blue_blush blue_tongue blush_lines bottom_sans brother/brother brothers chinese_text clothed digital_media_(artwork) drooling duo ectopenis ectotongue english_text face_out_of_frame fellatio finger_pointing fontcest genitals glowing glowing_genitalia glowing_penis hand_on_penis heki_(miss60250) hoodie incest intraspecies letterboxed licking_penis looking_up male male/male male_focus male_only monster monster_boy orange_penis papyrus_(undertale) papysans partial_male penis penis_out saliva sans_(undertale) sibling_incest siblings skeleton solo_focus sweat sweatdrop text tongue tongue_out top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis yaoi
2016 2boys 2d animated_skeleton artist_name blue_blush blue_tongue blush_lines bottom_sans brother/brother brothers chinese_text clothed digital_media_(artwork) drooling duo ectopenis ectotongue english_text face_out_of_frame fellatio finger_pointing fontcest genitals glowing glowing_genitalia glowing_penis hand_on_penis heki_(miss60250) hoodie incest intraspecies letterboxed licking_penis looking_up male male/male male_focus male_only monster monster_boy orange_penis papyrus_(undertale) papysans partial_male penis penis_out saliva sans_(undertale) sibling_incest siblings skeleton solo_focus sweat sweatdrop text tongue tongue_out top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis yaoi
2016 2boys 2d anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_border blue_blush blue_penis blue_tongue blush bottom_sans bottomless brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male cum cum_string cum_while_penetrated cum_while_penetrating cumming_together cumshot digital_media drooling duo ectopenis ectotongue ejaculation ejaculation_while_penetrated fontcest fully_clothed fully_clothed_male gay genital_fluids genitals gloves heki_(miss60250) hooded_jacket hoodie incest intraspecies larger_penetrating larger_penetrating_smaller leg_grab leg_held_up legs_apart letterboxed male male/male male_only male_penetrating_male monster monster_boy orange_blush orange_penis orgasm papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis red_gloves saliva sans_(undertale) sex shirt_up sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs submissive tears teeth third-party_source tongue tongue_out top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2016 2boys 2d anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_border blue_blush blue_penis blue_tongue blush bottom_sans bottomless brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male cum cum_string cum_while_penetrated cum_while_penetrating cumming_together cumshot digital_media drooling duo ectopenis ectotongue ejaculation ejaculation_while_penetrated fontcest fully_clothed fully_clothed_male gay genital_fluids genitals gloves heki_(miss60250) hooded_jacket hoodie incest intraspecies larger_penetrating larger_penetrating_smaller leg_grab leg_held_up legs_apart letterboxed male male/male male_only male_penetrating_male monster monster_boy orange_blush orange_penis orgasm papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis red_gloves saliva sans_(undertale) sex shirt_up sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs submissive tears teeth third-party_source tongue tongue_out top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2boys animated_skeleton blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed duo fontcest fontgalore grabbing_face grey_background hand incest male male_only monster one_eye_closed out_of_frame pancakepants papyrus papyrus_(undertale) papysans saliva saliva_on_finger saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus skeleton solid_color_background solo_focus submissive tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body yaoi
2010s 2018 2boys animated_skeleton blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed duo fontcest fontgalore grabbing_face grey_background hand incest male male_only monster one_eye_closed out_of_frame pancakepants papyrus papyrus_(undertale) papysans saliva saliva_on_finger saliva_on_tongue saliva_trail sans sans_(undertale) seme_papyrus skeleton solid_color_background solo_focus submissive tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body yaoi
2boys 2d 2d_(artwork) animated_skeleton bimbaloon blue_eyes blue_tongue bottom_sans brother brothers clothed dark_background digital_media_(artwork) duo ectotongue fellatio fellatio_pov fontcest glowing_cum grabbing_penis hi_res incest licking_penis littlegreendorito long_tongue looking_at_viewer male male_focus male_only male_pov monster oral orange_body orange_penis papyrus papyrus_(undertale) papysans partial_male penis pov pov_eye_contact sans sans_(undertale) seme_papyrus skeleton solo_focus third-party_source tongue top_papyrus tumblr_username twitter uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton bimbaloon blue_eyes blue_tongue bottom_sans brother brothers clothed dark_background digital_media_(artwork) duo ectotongue fellatio fellatio_pov fontcest glowing_cum grabbing_penis hi_res incest licking_penis littlegreendorito long_tongue looking_at_viewer male male_focus male_only male_pov monster oral orange_body orange_penis papyrus papyrus_(undertale) papysans partial_male penis pov pov_eye_contact sans sans_(undertale) seme_papyrus skeleton solo_focus third-party_source tongue top_papyrus tumblr_username twitter uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_game_character video_games yaoi
2boys 2d animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_hoodie blue_jacket blue_tongue blush bottom_sans brother/brother brother_penetrating_brother brothers clothed digital_media drunk duo ectopenis english_text face_grab fontcest from_behind_position ganzooky gay grabbing_face highres hood hooded_jacket humanoid incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller lying male male/male male_only male_penetrating monster monster_boy on_snow on_stomach one_eye_closed orange_blush orange_penis outside pants_around_one_leg pants_pulled_down papyrus_(undertale) papysans penetration penetration_from_behind sans_(undertale) sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom snow sweat text tongue tongue_out top_papyrus undead undertale undertale_(series) video_game_character video_games white_background yaoi
2boys 2d animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_hoodie blue_jacket blue_tongue blush bottom_sans brother/brother brother_penetrating_brother brothers clothed digital_media drunk duo ectopenis english_text face_grab fontcest from_behind_position ganzooky gay grabbing_face highres hood hooded_jacket humanoid incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller lying male male/male male_only male_penetrating monster monster_boy on_snow on_stomach one_eye_closed orange_blush orange_penis outside pants_around_one_leg pants_pulled_down papyrus_(undertale) papysans penetration penetration_from_behind sans_(undertale) sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom snow sweat text tongue tongue_out top_papyrus undead undertale undertale_(series) video_game_character video_games white_background yaoi
2018 2boys 2d animated_skeleton begging blue_blush blue_choker blue_collar blue_tongue blush bottom_sans choker clothed collar digital_media ectotongue english_text humanoid imminent_fellatio inviting male male/male male_focus male_only malesub monster nsfwgarbagedump nude open_mouth petplay pointing_at_self sans_(undertale) sequential skeleton solo solo_focus submissive submissive_male talking talking_to_viewer text tongue tongue_out undead undertale undertale_(series) upper_body white_background yaoi
2018 2boys 2d animated_skeleton begging blue_blush blue_choker blue_collar blue_tongue blush bottom_sans choker clothed collar digital_media ectotongue english_text humanoid imminent_fellatio inviting male male/male male_focus male_only malesub monster nsfwgarbagedump nude open_mouth petplay pointing_at_self sans_(undertale) sequential skeleton solo solo_focus submissive submissive_male talking talking_to_viewer text tongue tongue_out undead undertale undertale_(series) upper_body white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brothers chin_grab clothed digital_media_(artwork) duo ectotongue english_text face_grab fontcest food grabbing_another's_chin implied_sex incest licking licking_neck licking_popsicle monster monster_boy multiple_views orange_popsicle orange_tongue papyrus papyrus_(undertale) papysans partially_colored popsicle sans sans_(undertale) seme_papyrus skeleton spoken_musical_note suggestive_food sympharin symphysins text tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brothers chin_grab clothed digital_media_(artwork) duo ectotongue english_text face_grab fontcest food grabbing_another's_chin implied_sex incest licking licking_neck licking_popsicle monster monster_boy multiple_views orange_popsicle orange_tongue papyrus papyrus_(undertale) papysans partially_colored popsicle sans sans_(undertale) seme_papyrus skeleton spoken_musical_note suggestive_food sympharin symphysins text tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton blue_eyes blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed dark dark_background digital_media_(artwork) fellatio fellatio_pov fontcest genitals glowing glowing_genitalia glowing_penis grabbing_penis incest licking licking_penis male male_only male_pov monster monster_boy oral orange_penis papyrus papyrus_(undertale) papysans penis pov sans sans_(undertale) seme_papyrus sex sinncognito skeleton solo_focus top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games yaoi
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton blue_eyes blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed dark dark_background digital_media_(artwork) fellatio fellatio_pov fontcest genitals glowing glowing_genitalia glowing_penis grabbing_penis incest licking licking_penis male male_only male_pov monster monster_boy oral orange_penis papyrus papyrus_(undertale) papysans penis pov sans sans_(undertale) seme_papyrus sex sinncognito skeleton solo_focus top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games yaoi
2018 animated_skeleton blue_blush blue_eyes blue_tongue bottom_sans clothed headogs heart-shaped_pupils heart_eyes male monster orange_penis penetration penis sans sans_(undertale) sex skeleton solo_focus submissive tongue tongue_out uke_sans undead undertale undertale_(series)
2018 animated_skeleton blue_blush blue_eyes blue_tongue bottom_sans clothed headogs heart-shaped_pupils heart_eyes male monster orange_penis penetration penis sans sans_(undertale) sex skeleton solo_focus submissive tongue tongue_out uke_sans undead undertale undertale_(series)
1boy 2010s 2015 2d 2d_(artwork) ahegao animated_skeleton blue_tentacles blue_tongue bottom_sans bottomless clothed clothing cockotron digital_media_(artwork) drooling fvdsfs jacket jacket_only male male_ahegao male_focus male_only malesub monochrome monster partially_clothed partially_nude sans sans_(undertale) simple_background skeleton solo solo_focus submissive submissive_male tentacle tentacles tentacles_around_arms tentacles_around_legs tentacles_around_wrists tongue tongue_out tumblr_username uke_sans undead undertale undertale_(series) video_games
1boy 2010s 2015 2d 2d_(artwork) ahegao animated_skeleton blue_tentacles blue_tongue bottom_sans bottomless clothed clothing cockotron digital_media_(artwork) drooling fvdsfs jacket jacket_only male male_ahegao male_focus male_only malesub monochrome monster partially_clothed partially_nude sans sans_(undertale) simple_background skeleton solo solo_focus submissive submissive_male tentacle tentacles tentacles_around_arms tentacles_around_legs tentacles_around_wrists tongue tongue_out tumblr_username uke_sans undead undertale undertale_(series) video_games
1boy 2015 2d 2d_(artwork) ahegao animated_skeleton blue_blush blue_tongue blush bottom_sans clothed digital_media_(artwork) heart heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket male_ahegao monster sans sans_(undertale) skeleton solo_male suckmytrombone tongue tongue_out uke_sans undead undertale undertale_(series) upper_body video_games
1boy 2015 2d 2d_(artwork) ahegao animated_skeleton blue_blush blue_tongue blush bottom_sans clothed digital_media_(artwork) heart heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket male_ahegao monster sans sans_(undertale) skeleton solo_male suckmytrombone tongue tongue_out uke_sans undead undertale undertale_(series) upper_body video_games
2015 2boys 2d 2d_(artwork) animated_skeleton anon anonymous_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans clothed digital_media_(artwork) english_text eye_fucking eye_penetration heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket male male_focus male_only monster penis penis_in_eye sans sans_(undertale) skeleton skull_fucking solo_focus suckmytrombone text tongue tongue_out uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2015 2boys 2d 2d_(artwork) animated_skeleton anon anonymous_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans clothed digital_media_(artwork) english_text eye_fucking eye_penetration heart-shaped_pupils heart_eyes hooded_jacket hoodie jacket male male_focus male_only monster penis penis_in_eye sans sans_(undertale) skeleton skull_fucking solo_focus suckmytrombone text tongue tongue_out uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1boy 2010s 2018 animated_skeleton blue_eye blue_tongue bottom_sans completely_nude drooling ectoplasm egg egg_laying eggs heki_(miss60250) kneel laying_eggs male monster monster_boy naked nude nude_male sans sans_(undertale) simple_background skeleton solo_male submissive sweat tongue tongue_out uke_sans undead undertale undertale_(series) white_background
1boy 2010s 2018 animated_skeleton blue_eye blue_tongue bottom_sans completely_nude drooling ectoplasm egg egg_laying eggs heki_(miss60250) kneel laying_eggs male monster monster_boy naked nude nude_male sans sans_(undertale) simple_background skeleton solo_male submissive sweat tongue tongue_out uke_sans undead undertale undertale_(series) white_background
1boy 2016 2d 2d_(artwork) animated_skeleton blue_blush blue_jacket blue_tongue blush clothed dark_background digital_media_(artwork) disembodied_hand grabbing_mouth hand jacket male male_focus monster mouth_held_open one_eye_closed sans sans_(undertale) simple_background skeleton solid_color_background solo_focus tears tinyskeletonfucker tongue tumblr tumblr_username undead undertale undertale_(series) upper_body video_game_character video_games
1boy 2016 2d 2d_(artwork) animated_skeleton blue_blush blue_jacket blue_tongue blush clothed dark_background digital_media_(artwork) disembodied_hand grabbing_mouth hand jacket male male_focus monster mouth_held_open one_eye_closed sans sans_(undertale) simple_background skeleton solid_color_background solo_focus tears tinyskeletonfucker tongue tumblr tumblr_username undead undertale undertale_(series) upper_body video_game_character video_games
1boy 2020 2d 2d_(artwork) animated_skeleton arm_grab artist_name black_background blue_blush blue_tongue blush bottom_sans dark_background digital_media_(artwork) disembodied_hands ectopenis groping handjob hands leg_grab male male_focus mmishame monster monster_boy multiple_hands nude nude_male penis penis_grab precum sans sans_(undertale) skeleton solo_focus solo_male spread_legs tongue tongue_grab tongue_out touching_penis uke_sans undead undertale undertale_(series) video_game_character video_games
1boy 2020 2d 2d_(artwork) animated_skeleton arm_grab artist_name black_background blue_blush blue_tongue blush bottom_sans dark_background digital_media_(artwork) disembodied_hands ectopenis groping handjob hands leg_grab male male_focus mmishame monster monster_boy multiple_hands nude nude_male penis penis_grab precum sans sans_(undertale) skeleton solo_focus solo_male spread_legs tongue tongue_grab tongue_out touching_penis uke_sans undead undertale undertale_(series) video_game_character video_games
animated_skeleton artist_request blue_blush blue_tongue blush bottom_sans disembodied_hand food hand hooded_jacket hoodie hot_dog hotdog jacket monster off_shoulder off_shoulders one_eye_closed sans sans_(undertale) skeleton solo_focus suggestive suggestive_food tongue tongue_out uke_sans undead undertale undertale_(series) upper_body white_background
animated_skeleton artist_request blue_blush blue_tongue blush bottom_sans disembodied_hand food hand hooded_jacket hoodie hot_dog hotdog jacket monster off_shoulder off_shoulders one_eye_closed sans sans_(undertale) skeleton solo_focus suggestive suggestive_food tongue tongue_out uke_sans undead undertale undertale_(series) upper_body white_background
animated_skeleton artist_request blue_blush blue_jacket blue_tongue blush bottom_sans disembodied_hand grabbing_own_leg groping hand jacket looking_down monster nude off_shoulder off_shoulders sans sans_(undertale) skeleton solo_focus submissive tongue tongue_out touching_crotch uke_sans undead undertale undertale_(series) white_background
animated_skeleton artist_request blue_blush blue_jacket blue_tongue blush bottom_sans disembodied_hand grabbing_own_leg groping hand jacket looking_down monster nude off_shoulder off_shoulders sans sans_(undertale) skeleton solo_focus submissive tongue tongue_out touching_crotch uke_sans undead undertale undertale_(series) white_background
1cuntboy 2010s 2018 animated_skeleton blue_blush blue_hoodie blue_jacket blue_tongue bottom_sans covering_mouth covering_own_mouth cuntboy cuntboy_only dripping_pussy dripping_vagina dubnyangg ectopussy fingering fingering_pussy fingers_in_pussy hooded_jacket hoodie jacket looking_down monster one_eye_closed partially_nude pussy sans sans_(undertale) skeleton solo solo_cuntboy text tongue tongue_out uke_sans undead undertale undertale_(series) vaginal_fingering vaginal_juices vaginal_masturbation
1cuntboy 2010s 2018 animated_skeleton blue_blush blue_hoodie blue_jacket blue_tongue bottom_sans covering_mouth covering_own_mouth cuntboy cuntboy_only dripping_pussy dripping_vagina dubnyangg ectopussy fingering fingering_pussy fingers_in_pussy hooded_jacket hoodie jacket looking_down monster one_eye_closed partially_nude pussy sans sans_(undertale) skeleton solo solo_cuntboy text tongue tongue_out uke_sans undead undertale undertale_(series) vaginal_fingering vaginal_juices vaginal_masturbation
1boy 1other 2022 2d ambiguous_fluids animated_skeleton basho_lizard blue_blush blue_hoodie blue_jacket blue_popsicle blue_tongue blush bottom_sans clothed digital_media fluids hand hooded_jacket hoodie humanoid jacket male male_focus monster popsicle sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive suggestive_fluid suggestive_food tongue tongue_out undead undertale undertale_(series) upper_body white_background
1boy 1other 2022 2d ambiguous_fluids animated_skeleton basho_lizard blue_blush blue_hoodie blue_jacket blue_popsicle blue_tongue blush bottom_sans clothed digital_media fluids hand hooded_jacket hoodie humanoid jacket male male_focus monster popsicle sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive suggestive_fluid suggestive_food tongue tongue_out undead undertale undertale_(series) upper_body white_background
1boy 1other 2022 2d animated_skeleton basho_lizard blue_blush blue_hoodie blue_jacket blue_popsicle blue_tongue blush bottom_sans clothed digital_media hooded_jacket hoodie humanoid jacket male male_focus monster popsicle sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive suggestive_food tongue tongue_out undead undertale undertale_(series) upper_body white_background
1boy 1other 2022 2d animated_skeleton basho_lizard blue_blush blue_hoodie blue_jacket blue_popsicle blue_tongue blush bottom_sans clothed digital_media hooded_jacket hoodie humanoid jacket male male_focus monster popsicle sans_(undertale) sexually_suggestive skeleton solo_focus submissive suggestive suggestive_food tongue tongue_out undead undertale undertale_(series) upper_body white_background
1boy 2015 2d animated animated_gif animated_skeleton animation blue_hoodie blue_jacket blue_popsicle blue_tongue clothed digital_media food gif hooded_jacket hoodie jacket knocker12 licking looping_animation male male_only monster popsicle sans_(undertale) simple_background skeleton solo solo_male tongue undead undertale undertale_(series) upper_body video_game_character video_games white_background
1boy 2015 2d animated animated_gif animated_skeleton animation blue_hoodie blue_jacket blue_popsicle blue_tongue clothed digital_media food gif hooded_jacket hoodie jacket knocker12 licking looping_animation male male_only monster popsicle sans_(undertale) simple_background skeleton solo solo_male tongue undead undertale undertale_(series) upper_body video_game_character video_games white_background
1:1 1:1_aspect_ratio animated_skeleton artist_name blue_blush blue_tongue blush bottom_sans bound_arms clothed dubnyangg grey_background monster purple_tentacles sans sans_(undertale) shirt_up simple_background skeleton solid_color_background solo tentacle tentacle_around_leg tentacle_in_mouth tentacle_sex tentacles_around_arms tentacles_in_pants tentacles_under_clothes tongue tongue_out uke_sans undead undertale undertale_(series)
1:1 1:1_aspect_ratio animated_skeleton artist_name blue_blush blue_tongue blush bottom_sans bound_arms clothed dubnyangg grey_background monster purple_tentacles sans sans_(undertale) shirt_up simple_background skeleton solid_color_background solo tentacle tentacle_around_leg tentacle_in_mouth tentacle_sex tentacles_around_arms tentacles_in_pants tentacles_under_clothes tongue tongue_out uke_sans undead undertale undertale_(series)
1cuntboy 2018 animated_skeleton blue_blush blue_clitoris blue_hoodie blue_jacket blue_tongue bottom_sans clitoris cuntboy dripping_pussy dripping_vagina dubnyangg ectopussy english_text fingering fingering_pussy fingers_in_pussy heart hooded_jacket hoodie jacket male_moaning moaning monster partially_nude pussy sans sans_(undertale) skeleton spread_pussy text tongue_out uke_sans undertale undertale_(series) vaginal_fingering vaginal_juices
1cuntboy 2018 animated_skeleton blue_blush blue_clitoris blue_hoodie blue_jacket blue_tongue bottom_sans clitoris cuntboy dripping_pussy dripping_vagina dubnyangg ectopussy english_text fingering fingering_pussy fingers_in_pussy heart hooded_jacket hoodie jacket male_moaning moaning monster partially_nude pussy sans sans_(undertale) skeleton spread_pussy text tongue_out uke_sans undertale undertale_(series) vaginal_fingering vaginal_juices
2010s 2boys alternate_version_available animated_skeleton big_penis blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers duo ectopenis eli-sin-g fontcest grabbing_leg incest kolesjoie licking_penis looking_at_viewer male male/male male_only male_pov monster one_eye_closed orange_penis papyrus papyrus_(undertale) papysans penis pov precum sans sans_(undertale) seme_papyrus sepia skeleton solo_focus sweat tongue top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face veiny_penis yaoi
2010s 2boys alternate_version_available animated_skeleton big_penis blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers duo ectopenis eli-sin-g fontcest grabbing_leg incest kolesjoie licking_penis looking_at_viewer male male/male male_only male_pov monster one_eye_closed orange_penis papyrus papyrus_(undertale) papysans penis pov precum sans sans_(undertale) seme_papyrus sepia skeleton solo_focus sweat tongue top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face veiny_penis yaoi
2010s 2boys alternate_version_available animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chocolate duo eli-sin-g fontcest food food_play grabbing_leg incest kolesjoie licking_food looking_at_viewer male male/male male_only male_pov monster one_eye_closed papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus sepia skeleton solo_focus tongue top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2010s 2boys alternate_version_available animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chocolate duo eli-sin-g fontcest food food_play grabbing_leg incest kolesjoie licking_food looking_at_viewer male male/male male_only male_pov monster one_eye_closed papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus sepia skeleton solo_focus tongue top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face yaoi