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1girl air_bubbles armwear asphyxiation big_breasts bondage breasts bubbles censored censored_pussy darkseether drowning elbow_gloves female fingerless_gloves gloves marvel mosaic_censoring navel nipples nude ocean peril psylocke pussy sea solo tied_wrists underwater underwater_peril water wrapped x-men
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2017 2boys 2d alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blush blushing_male bottom_sans bound bound_wrists brother/brother brothers christmas clothed clothing digital_media dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year humanoid imminent_sex incest intraspecies looking_at_genitalia looking_at_penis looking_down male male/male male_only maledom malesub monster monster_boy new_year orange_blush orange_penis papyrus_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans_(undertale) santa_hat scarf sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth teeth text theyaois tied_up tied_wrists top_papyrus undead undertale undertale_(series) video_game_character video_games yandere yaoi
2017 2boys 2d alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blush blushing_male bottom_sans bound bound_wrists brother/brother brothers christmas clothed clothing digital_media dominant dominant_male domination duo ectopenis english_text fontcest genitals gloves happy_new_year humanoid imminent_sex incest intraspecies looking_at_genitalia looking_at_penis looking_down male male/male male_only maledom malesub monster monster_boy new_year orange_blush orange_penis papyrus_(undertale) papysans penis penis_out precum questionable_consent red_gloves red_scarf sans_(undertale) santa_hat scarf sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom submissive submissive_male taped_mouth teeth text theyaois tied_up tied_wrists top_papyrus undead undertale undertale_(series) video_game_character video_games yandere yaoi
2017 2boys 2d alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans bound bound_wrists brother/brother brothers christmas clothed clothing digital_media dominant dominant_male domination duo english_text fontcest gloves happy_new_year humanoid imminent_sex incest intraspecies male male/male male_only maledom malesub monster monster_boy new_year papyrus_(undertale) papysans questionable_consent red_gloves red_scarf sans_(undertale) santa_hat scarf sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom speech_bubble submissive submissive_male taped_mouth teeth text theyaois tied_up tied_wrists top_papyrus undead undertale undertale_(series) video_game_character video_games yandere yaoi
2017 2boys 2d alternate_version_available animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans bound bound_wrists brother/brother brothers christmas clothed clothing digital_media dominant dominant_male domination duo english_text fontcest gloves happy_new_year humanoid imminent_sex incest intraspecies male male/male male_only maledom malesub monster monster_boy new_year papyrus_(undertale) papysans questionable_consent red_gloves red_scarf sans_(undertale) santa_hat scarf sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_sub_bigger_dom speech_bubble submissive submissive_male taped_mouth teeth text theyaois tied_up tied_wrists top_papyrus undead undertale undertale_(series) video_game_character video_games yandere yaoi
1boy 2d 2d_(artwork) animated_skeleton blue_blush blush bondage bottom_sans bound bound_wrists cussing digital_media_(artwork) disembodied_hand disembodied_hands drooling groping hands hands_over_head kneel kneeling magic_hands male male_focus male_only malesub monochrome monster pants_down pants_pulled_down partially_colored profanity restrained sans sans_(undertale) sequence sequential shirt_lift shirt_pulled_up shirt_up simple_background singingsans skeleton solo_male submissive submissive_male swearing sweat third-party_source tied_up tied_wrists touching_crotch trembling uke_sans undead undertale undertale_(series) video_games
1boy 2d 2d_(artwork) animated_skeleton blue_blush blush bondage bottom_sans bound bound_wrists cussing digital_media_(artwork) disembodied_hand disembodied_hands drooling groping hands hands_over_head kneel kneeling magic_hands male male_focus male_only malesub monochrome monster pants_down pants_pulled_down partially_colored profanity restrained sans sans_(undertale) sequence sequential shirt_lift shirt_pulled_up shirt_up simple_background singingsans skeleton solo_male submissive submissive_male swearing sweat third-party_source tied_up tied_wrists touching_crotch trembling uke_sans undead undertale undertale_(series) video_games
1cuntboy 2019 2d absurd_res absurdres animated_skeleton artist_logo artist_name blue_blush blue_hoodie blue_jacket blue_pussy blush bondage bottom_sans bottomless bottomless_cuntboy bound bound_arms bound_legs bound_wrists candy_cane christmas christmas_lights clothed clothing cuntboy cuntboy_only digital_media drooling ectoplasm ectopussy english_text fontcest ganzooky holidays hooded_jacket hoodie humanoid implied_incest implied_yaoi jacket legs_apart male male_only merry_christmas mistletoe monster object_in_mouth object_insertion papysans penetration pink_slippers pussy red_ribbon restrained restraints ribbon sans_(undertale) skeleton slippers spreader_bar submissive text tied_arms tied_up tied_wrists undead undertale undertale_(series) vaginal vaginal_insertion vaginal_object_insertion video_games
1cuntboy 2019 2d absurd_res absurdres animated_skeleton artist_logo artist_name blue_blush blue_hoodie blue_jacket blue_pussy blush bondage bottom_sans bottomless bottomless_cuntboy bound bound_arms bound_legs bound_wrists candy_cane christmas christmas_lights clothed clothing cuntboy cuntboy_only digital_media drooling ectoplasm ectopussy english_text fontcest ganzooky holidays hooded_jacket hoodie humanoid implied_incest implied_yaoi jacket legs_apart male male_only merry_christmas mistletoe monster object_in_mouth object_insertion papysans penetration pink_slippers pussy red_ribbon restrained restraints ribbon sans_(undertale) skeleton slippers spreader_bar submissive text tied_arms tied_up tied_wrists undead undertale undertale_(series) vaginal vaginal_insertion vaginal_object_insertion video_games
1boy animated_skeleton artist_request bondage bottom_sans bound bound_wrists dog_bowl food food_bowl hot_dog hotdog male male_only malesub monster nude nude_male restrained restraints rope rope_bondage sans sans_(undertale) skeleton solo_male soul soul_sex spreader_bar submissive submissive_male tied_up tied_wrists uke_sans undead undertale undertale_(series)
1boy animated_skeleton artist_request bondage bottom_sans bound bound_wrists dog_bowl food food_bowl hot_dog hotdog male male_only malesub monster nude nude_male restrained restraints rope rope_bondage sans sans_(undertale) skeleton solo_male soul soul_sex spreader_bar submissive submissive_male tied_up tied_wrists uke_sans undead undertale undertale_(series)
1:1 1:1_aspect_ratio 1boy 2d 2d_(artwork) animated_skeleton back_view blush bottom_sans bound bound_wrists digital_media_(artwork) looking_at_viewer looking_back looking_back_at_viewer male male_only malesub monster no_visible_genitalia nude nude_male nudity sacrum_lacing sans sans_(undertale) skeleton solo_male soul string submissive submissive_male sweat tied_wrists uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games white_background
1:1 1:1_aspect_ratio 1boy 2d 2d_(artwork) animated_skeleton back_view blush bottom_sans bound bound_wrists digital_media_(artwork) looking_at_viewer looking_back looking_back_at_viewer male male_only malesub monster no_visible_genitalia nude nude_male nudity sacrum_lacing sans sans_(undertale) skeleton solo_male soul string submissive submissive_male sweat tied_wrists uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games white_background
1boy 2d 2d_(artwork) animated_skeleton bound bound_wrists clothed digital_media_(artwork) ectotongue hooded_jacket hoodie jacket male monster sans sans_(undertale) simple_background skeleton submissive tied_up tied_wrists tongue tongue_out undead undertale undertale_(series) unknown_artist unknown_source video_games
1boy 2d 2d_(artwork) animated_skeleton bound bound_wrists clothed digital_media_(artwork) ectotongue hooded_jacket hoodie jacket male monster sans sans_(undertale) simple_background skeleton submissive tied_up tied_wrists tongue tongue_out undead undertale undertale_(series) unknown_artist unknown_source video_games
1boy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name bad_id bad_tumblr_id balls blue_background blue_blush blue_eye blue_penis blue_testicles blue_tongue blush bottom_sans bound_arms bound_wrists chain chain_leash chains collar cowboy_shot digital_media_(artwork) drooling ectopenis ectotongue glowing_eye inactive_account male male_only malesub monster naked noxiousaberration nude penis sans sans_(undertale) simple_background skeleton solo solo_male submissive submissive_male sweat testicles tied_up tied_wrists tongue tongue_out tumblr uke_sans undead undertale undertale_(series) video_game_character video_games
1boy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name bad_id bad_tumblr_id balls blue_background blue_blush blue_eye blue_penis blue_testicles blue_tongue blush bottom_sans bound_arms bound_wrists chain chain_leash chains collar cowboy_shot digital_media_(artwork) drooling ectopenis ectotongue glowing_eye inactive_account male male_only malesub monster naked noxiousaberration nude penis sans sans_(undertale) simple_background skeleton solo solo_male submissive submissive_male sweat testicles tied_up tied_wrists tongue tongue_out tumblr uke_sans undead undertale undertale_(series) video_game_character video_games
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
animated_skeleton ass ass_up blue_blush blue_collar blush bodily_fluids bottom_sans bottomless bound_wrists collar collar_and_leash filthysmashpeach fluids kneeling leash leash_and_collar looking_at_viewer male male_only monochrome monster one_eye_closed partially_clothed partially_colored sans sans_(undertale) skeleton solo solo_male submissive tied_wrists top-down_bottom-up uke_sans undead undertale undertale_(series)
animated_skeleton ass ass_up blue_blush blue_collar blush bodily_fluids bottom_sans bottomless bound_wrists collar collar_and_leash filthysmashpeach fluids kneeling leash leash_and_collar looking_at_viewer male male_only monochrome monster one_eye_closed partially_clothed partially_colored sans sans_(undertale) skeleton solo solo_male submissive tied_wrists top-down_bottom-up uke_sans undead undertale undertale_(series)
2022 2d 2d_(artwork) 3boys animated_skeleton anon anonymous_male bad_id bad_twitter_id bottom_sans bottomless bottomless_male bound_wrists clothed crying cum cum_on_face digital_media_(artwork) forced_fellatio forced_oral grabbing_head head_grab head_push hoodie inactive_account irrumatio male male/male male_focus male_only monster monster_boy multiple_boys non-consensual nonconsensual penetration penis pushing_head pushing_head_down rape sans sans_(undertale) sex simple_background skeleton sketch solo_focus spitroast sweat tied_up tied_wrists toubigaizi twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games white_background yaoi
2022 2d 2d_(artwork) 3boys animated_skeleton anon anonymous_male bad_id bad_twitter_id bottom_sans bottomless bottomless_male bound_wrists clothed crying cum cum_on_face digital_media_(artwork) forced_fellatio forced_oral grabbing_head head_grab head_push hoodie inactive_account irrumatio male male/male male_focus male_only monster monster_boy multiple_boys non-consensual nonconsensual penetration penis pushing_head pushing_head_down rape sans sans_(undertale) sex simple_background skeleton sketch solo_focus spitroast sweat tied_up tied_wrists toubigaizi twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games white_background yaoi
1boy 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_penis blush blushing bottom_sans bottomless bottomless_male bound_wrists digital_media_(artwork) ectopenis humanoid jacket male male_only malesub monster monster_boy nsfwgarbagedump panting penis pixiv sans sans_(undertale) simple_background skeleton solo_male submissive submissive_male tied_up tied_wrists tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background
1boy 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_penis blush blushing bottom_sans bottomless bottomless_male bound_wrists digital_media_(artwork) ectopenis humanoid jacket male male_only malesub monster monster_boy nsfwgarbagedump panting penis pixiv sans sans_(undertale) simple_background skeleton solo_male submissive submissive_male tied_up tied_wrists tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background
animated_skeleton blue_jacket blue_tongue bodily_fluids bondage bottom_sans bottomless bound_wrists closed_eyes clothed degradation disembodied_hand dripping_cum english_text fingering fluids genjisbuttclub jacket jacket_only kneel male_only monster partially_clothed partially_nude pov sans sans_(undertale) skeleton text tied_up tied_wrists tongue tongue_out touching_crotch trembling uke_sans undead undertale undertale_(series) white_background
animated_skeleton blue_jacket blue_tongue bodily_fluids bondage bottom_sans bottomless bound_wrists closed_eyes clothed degradation disembodied_hand dripping_cum english_text fingering fluids genjisbuttclub jacket jacket_only kneel male_only monster partially_clothed partially_nude pov sans sans_(undertale) skeleton text tied_up tied_wrists tongue tongue_out touching_crotch trembling uke_sans undead undertale undertale_(series) white_background
1boy 2d 2d_(artwork) black_hair boots bound_wrists digital_media_(artwork) femboy goodlegg grey_background hair hair_over_one_eye high_heel_boots hotlegmeme humanoid humanoid_robot kneel looking_at_viewer male male_only mettaton mettaton_ex multiple_views neck_tie pink_boots pink_high_heel_boots pose posing robot robot_boy robot_humanoid seductive shoes solo_male spank_marks tied_up tied_wrists tumblr unbuttoned unbuttoned_shirt undertale undertale_(series) video_game_character video_games
1boy 2d 2d_(artwork) black_hair boots bound_wrists digital_media_(artwork) femboy goodlegg grey_background hair hair_over_one_eye high_heel_boots hotlegmeme humanoid humanoid_robot kneel looking_at_viewer male male_only mettaton mettaton_ex multiple_views neck_tie pink_boots pink_high_heel_boots pose posing robot robot_boy robot_humanoid seductive shoes solo_male spank_marks tied_up tied_wrists tumblr unbuttoned unbuttoned_shirt undertale undertale_(series) video_game_character video_games
2010s 2016 animated_skeleton back_view bottom_sans bound_ankles bound_wrists completely_naked completely_nude kneel monochrome nude sacrum_lacing safetytrance sans sans_(undertale) skeleton solo sweat tied_ankles tied_up tied_wrists uke_sans undead undertale undertale_(series)
2010s 2016 animated_skeleton back_view bottom_sans bound_ankles bound_wrists completely_naked completely_nude kneel monochrome nude sacrum_lacing safetytrance sans sans_(undertale) skeleton solo sweat tied_ankles tied_up tied_wrists uke_sans undead undertale undertale_(series)
2d animated_skeleton anon anonymous_male bdsm bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blindfold blindfolded blue_blush blue_hoodie blue_jacket blush bondage bottom_sans clothed digital_media_(artwork) drooling faceless_male from_behind from_behind_position hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy penetration penetration_from_behind sans sans_(undertale) sex sex_from_behind simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tied_up tied_wrists uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d animated_skeleton anon anonymous_male bdsm bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blindfold blindfolded blue_blush blue_hoodie blue_jacket blush bondage bottom_sans clothed digital_media_(artwork) drooling faceless_male from_behind from_behind_position hooded_jacket hoodie jacket larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy penetration penetration_from_behind sans sans_(undertale) sex sex_from_behind simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tied_up tied_wrists uke_sans undead undertale undertale_(series) unseen_male_face white_background yaoi
2d animated_skeleton anon anonymous_male bdsm blue_blush blue_hoodie blue_jacket blush bottom_sans bound_wrists clothed digital_media_(artwork) dominant_pov drooling ectoplasm faceless_male from_front_position hooded_jacket hoodie jacket logo_(pixiv_id_30462562) looking_at_viewer male male_pov monster monster_boy on_back penetrating_pov penetration pov sans sans_(undertale) sex skeleton solo_focus spread_legs submissive sweat tied_up tied_wrists uke_sans undead undertale undertale_(series) unseen_male_face white_background wide_eyed yaoi
2d animated_skeleton anon anonymous_male bdsm blue_blush blue_hoodie blue_jacket blush bottom_sans bound_wrists clothed digital_media_(artwork) dominant_pov drooling ectoplasm faceless_male from_front_position hooded_jacket hoodie jacket logo_(pixiv_id_30462562) looking_at_viewer male male_pov monster monster_boy on_back penetrating_pov penetration pov sans sans_(undertale) sex skeleton solo_focus spread_legs submissive sweat tied_up tied_wrists uke_sans undead undertale undertale_(series) unseen_male_face white_background wide_eyed yaoi
16:9 16:9_aspect_ratio 1920x1080 2018 2boys 2d animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans bound_wrists brother/brother brothers collaboration crying crying_with_eyes_open digital_media dominant dominant_male duo ectopenis fontcest genitals grabbing_own_penis grabbing_penis holding_own_penis holding_penis imminent_rape imminent_sex incest iniquityhalo larger_male lowest-of-dirt macro macro_male macrophilia male male_only maledom malesub micro micro_male microphilia miniboy non-consensual nonconsensual nude orange_penis papyrus_(undertale) papysans partial_male penis precum rape rope sans_(undertale) size_difference skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male tied_wrists top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
16:9 16:9_aspect_ratio 1920x1080 2018 2boys 2d animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans bound_wrists brother/brother brothers collaboration crying crying_with_eyes_open digital_media dominant dominant_male duo ectopenis fontcest genitals grabbing_own_penis grabbing_penis holding_own_penis holding_penis imminent_rape imminent_sex incest iniquityhalo larger_male lowest-of-dirt macro macro_male macrophilia male male_only maledom malesub micro micro_male microphilia miniboy non-consensual nonconsensual nude orange_penis papyrus_(undertale) papysans partial_male penis precum rape rope sans_(undertale) size_difference skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male tied_wrists top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 1boy 2020s 2022 2d 2d_(artwork) ahegao animated_skeleton blush_lines bottom_sans bound_wrists digital_media_(artwork) heart-shaped_pupils heart_eyes legs_spread male male_ahegao male_only malesub mouth_open nude nude_male open_mouth pleasure_face purplebluepen45 sans sans_(undertale) skeleton socks socks_on socks_only spread_legs submissive submissive_male tied_up tied_wrists trembling uke_sans undead undertale undertale_(series) video_games youfoundta
1:1 1:1_aspect_ratio 1boy 2020s 2022 2d 2d_(artwork) ahegao animated_skeleton blush_lines bottom_sans bound_wrists digital_media_(artwork) heart-shaped_pupils heart_eyes legs_spread male male_ahegao male_only malesub mouth_open nude nude_male open_mouth pleasure_face purplebluepen45 sans sans_(undertale) skeleton socks socks_on socks_only spread_legs submissive submissive_male tied_up tied_wrists trembling uke_sans undead undertale undertale_(series) video_games youfoundta
1:1 1:1_aspect_ratio 1boy 2020s 2022 2d 2d_(artwork) animated_skeleton blush_lines bottom_sans bound_wrists digital_media_(artwork) legs_spread male male_only malesub nude nude_male purplebluepen45 sans sans_(undertale) skeleton socks socks_on socks_only spread_legs submissive submissive_male tied_up tied_wrists trembling uke_sans undead undertale undertale_(series) video_games youfoundta
1:1 1:1_aspect_ratio 1boy 2020s 2022 2d 2d_(artwork) animated_skeleton blush_lines bottom_sans bound_wrists digital_media_(artwork) legs_spread male male_only malesub nude nude_male purplebluepen45 sans sans_(undertale) skeleton socks socks_on socks_only spread_legs submissive submissive_male tied_up tied_wrists trembling uke_sans undead undertale undertale_(series) video_games youfoundta
1boy 2010s 2017 2d 2d_(artwork) animated_skeleton artist_name blue_background blue_blush blue_eyes blue_penis blue_tongue blush bondage bone bottomless bottomless_male bound_ankles bound_arms bound_legs bound_wrists clothed clothed_male dark_background digital_media_(artwork) ectopenis english_text heki_(miss60250) male male_only monochrome monster monster_boy multiple_views omorashi peeing penis sans sans_(undertale) simple_background skeleton solid_color_background solo_male submissive text tied_ankles tied_up tied_wrists tongue tongue_out twitter unconscious undead undertale undertale_(series) urinating urinating_male urination video_game_character video_games
1boy 2010s 2017 2d 2d_(artwork) animated_skeleton artist_name blue_background blue_blush blue_eyes blue_penis blue_tongue blush bondage bone bottomless bottomless_male bound_ankles bound_arms bound_legs bound_wrists clothed clothed_male dark_background digital_media_(artwork) ectopenis english_text heki_(miss60250) male male_only monochrome monster monster_boy multiple_views omorashi peeing penis sans sans_(undertale) simple_background skeleton solid_color_background solo_male submissive text tied_ankles tied_up tied_wrists tongue tongue_out twitter unconscious undead undertale undertale_(series) urinating urinating_male urination video_game_character video_games
1:1 1:1_aspect_ratio 2010s 2019 animated_skeleton bottom_sans bottomless bound_wrists closed_eyes crossdressing line_art lineart lingerie male_only moaning monochrome nightgown nsfwgarbagedump patreon_reward sans sans_(undertale) skeleton socks socks_on solo submissive text tied_up tied_wrists uke_sans undead undertale undertale_(series) underwear white_background
1:1 1:1_aspect_ratio 2010s 2019 animated_skeleton bottom_sans bottomless bound_wrists closed_eyes crossdressing line_art lineart lingerie male_only moaning monochrome nightgown nsfwgarbagedump patreon_reward sans sans_(undertale) skeleton socks socks_on solo submissive text tied_up tied_wrists uke_sans undead undertale undertale_(series) underwear white_background
2018 2boys 2d alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brothers clothed clothed/nude clothed_male crying crying_with_eyes_open cum cum_on_face cumshot digital_media duo ectopenis ejaculation fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt male male_only male_penetrating monster monster_boy mouth_gag nude nude_male papyrus_(undertale) papysans partially_colored penetration penis sans_(undertale) sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2018 2boys 2d alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brothers clothed clothed/nude clothed_male crying crying_with_eyes_open cum cum_on_face cumshot digital_media duo ectopenis ejaculation fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt male male_only male_penetrating monster monster_boy mouth_gag nude nude_male papyrus_(undertale) papysans partially_colored penetration penis sans_(undertale) sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2018 2boys 2d alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brothers clothed clothed/nude clothed_male crying crying_with_eyes_open digital_media duo ectopenis fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt male male_only male_penetrating monster monster_boy mouth_gag nude nude_male papyrus_(undertale) papysans partially_colored penetration penis sans_(undertale) sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2018 2boys 2d alternate_version_available anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_eye bottom_sans bound_arms bound_wrists brothers clothed clothed/nude clothed_male crying crying_with_eyes_open digital_media duo ectopenis fontcest from_front_position genitals glowing_eye heart incest intraspecies larger_penetrating larger_penetrating_smaller legs_on_another's_shoulders legs_on_shoulders legs_over_partner's_shoulders legs_over_shoulders lowest-of-dirt male male_only male_penetrating monster monster_boy mouth_gag nude nude_male papyrus_(undertale) papysans partially_colored penetration penis sans_(undertale) sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tears tied_arms tied_up tied_wrists top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1boy 2021 2d 2d_(artwork) animated_skeleton arms_behind_back blue_blush blush bottom_sans bound_wrists digital_media_(artwork) gradient_background grey_background humanoid kneel looking_at_viewer male male_only meridasia monster monster_boy nude nude_male sacrum_lacing sans sans_(undertale) simple_background skeleton tied_arms tied_up tied_wrists uke_sans undead undertale undertale_(series) video_game_character video_games
1boy 2021 2d 2d_(artwork) animated_skeleton arms_behind_back blue_blush blush bottom_sans bound_wrists digital_media_(artwork) gradient_background grey_background humanoid kneel looking_at_viewer male male_only meridasia monster monster_boy nude nude_male sacrum_lacing sans sans_(undertale) simple_background skeleton tied_arms tied_up tied_wrists uke_sans undead undertale undertale_(series) video_game_character video_games