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2018 2boys 2d animated_skeleton blindfold blindfolded blue_tongue bondage bottom_sans bound bound_arms bound_wrists brother/brother brothers clothed clothed/nude clothing collar comic comic_panel digital_media dominant dominant_male domination duo ectopenis ectotongue english_text fontcest imminent_fellatio imminent_oral incest lowest-of-dirt male male/male male_only maledom monster nude orange_penis papyrus_(undertale) papysans partially_colored penis sans_(undertale) silhouette skeleton submissive text tied_arms tied_up tongue top_papyrus undead undertale undertale_(series) unzipping_pants video_game_character video_games white_background yandere yaoi
2018 2boys 2d animated_skeleton blindfold blindfolded blue_tongue bondage bottom_sans bound bound_arms bound_wrists brother/brother brothers clothed clothed/nude clothing collar comic comic_panel digital_media dominant dominant_male domination duo ectopenis ectotongue english_text fontcest imminent_fellatio imminent_oral incest lowest-of-dirt male male/male male_only maledom monster nude orange_penis papyrus_(undertale) papysans partially_colored penis sans_(undertale) silhouette skeleton submissive text tied_arms tied_up tongue top_papyrus undead undertale undertale_(series) unzipping_pants video_game_character video_games white_background yandere yaoi
2017 2boys 2d animated_skeleton bigger_male blue_blush blue_penis blush bottomless bottomless_male brother/brother brothers clothed clothing digital_media duo ectopenis english_text fontcest genitals gloves hooded_jacket hoodie implied_incest implied_yaoi jacket larger_male looking_at_another looking_at_genitalia looking_at_penis lowest-of-dirt male male/male male_only monster orange_blush orange_penis papyrus_(undertale) papysans partially_colored penis sans_(undertale) skeleton sketch smaller_male sweatdrop text undead undertale undertale_(series) video_game_character video_games white_background
2017 2boys 2d animated_skeleton bigger_male blue_blush blue_penis blush bottomless bottomless_male brother/brother brothers clothed clothing digital_media duo ectopenis english_text fontcest genitals gloves hooded_jacket hoodie implied_incest implied_yaoi jacket larger_male looking_at_another looking_at_genitalia looking_at_penis lowest-of-dirt male male/male male_only monster orange_blush orange_penis papyrus_(undertale) papysans partially_colored penis sans_(undertale) skeleton sketch smaller_male sweatdrop text undead undertale undertale_(series) video_game_character video_games white_background
1:1 1:1_aspect_ratio 2020 2020s 2boys 2d ? animated_skeleton anonymous_artist blush brother/brother brothers clothed clothing digital_meda duo eating_food eating_popsicle english_text fontcest food implied_incest implied_yaoi looking_at_another lowest-of-dirt male male/male male_only monster orange_blush orange_popsicle papyrus_(undertale) papysans partially_colored popsicle reference_image saliva sans_(undertale) skeleton spoken_question_mark suggestive suggestive_food text undead undertale undertale_(series) upper_body video_game_character video_games white_background
1:1 1:1_aspect_ratio 2020 2020s 2boys 2d ? animated_skeleton anonymous_artist blush brother/brother brothers clothed clothing digital_meda duo eating_food eating_popsicle english_text fontcest food implied_incest implied_yaoi looking_at_another lowest-of-dirt male male/male male_only monster orange_blush orange_popsicle papyrus_(undertale) papysans partially_colored popsicle reference_image saliva sans_(undertale) skeleton spoken_question_mark suggestive suggestive_food text undead undertale undertale_(series) upper_body video_game_character video_games white_background
2020 2boys 2d ? animated_skeleton blush brother/brother brothers clothed clothing digital_media duo eating_food eating_popsicle english_text fontcest food implied_incest implied_yaoi looking_at_another lowest-of-dirt male male/male male_only monster orange_blush orange_popsicle papyrus_(undertale) papysans partially_colored popsicle redraw saliva sans_(undertale) siblings skeleton spoken_question_mark suggestive suggestive_food text undead undertale undertale_(series) upper_body video_game_character video_games white_background
2020 2boys 2d ? animated_skeleton blush brother/brother brothers clothed clothing digital_media duo eating_food eating_popsicle english_text fontcest food implied_incest implied_yaoi looking_at_another lowest-of-dirt male male/male male_only monster orange_blush orange_popsicle papyrus_(undertale) papysans partially_colored popsicle redraw saliva sans_(undertale) siblings skeleton spoken_question_mark suggestive suggestive_food text undead undertale undertale_(series) upper_body video_game_character video_games white_background
2017 2boys 2d ? \r\n animated_skeleton blush brother/brother brothers clothed clothing digital_media duo eating_food eating_popsicle english_text fontcest food implied_incest implied_yaoi looking_at_another lowest-of-dirt male male/male male_only monster orange_blush orange_popsicle papyrus_(undertale) papysans partially_colored popsicle saliva sans_(undertale) skeleton spoken_question_mark suggestive suggestive_food text undead undertale undertale_(series) upper_body video_game_character video_games white_background
2017 2boys 2d ? \r\n animated_skeleton blush brother/brother brothers clothed clothing digital_media duo eating_food eating_popsicle english_text fontcest food implied_incest implied_yaoi looking_at_another lowest-of-dirt male male/male male_only monster orange_blush orange_popsicle papyrus_(undertale) papysans partially_colored popsicle saliva sans_(undertale) skeleton spoken_question_mark suggestive suggestive_food text undead undertale undertale_(series) upper_body video_game_character video_games white_background
1boy 2019 2d animated_skeleton arms_behind_back completely_nude completely_nude_male digital_media grey_background korean_text legs_apart looking_at_viewer lowest-of-dirt male male_only monster ms_paint nude nude_male oekaki sans_(undertale) simple_background sitting skeleton solid_color_background solo_male text undead undertale undertale_(series) video_game_character video_games
1boy 2019 2d animated_skeleton arms_behind_back completely_nude completely_nude_male digital_media grey_background korean_text legs_apart looking_at_viewer lowest-of-dirt male male_only monster ms_paint nude nude_male oekaki sans_(undertale) simple_background sitting skeleton solid_color_background solo_male text undead undertale undertale_(series) video_game_character video_games
2017 2boys 2d animal animated_skeleton annoying_dog_(undertale) bottom_sans brother/brother brothers canid canine canis clothed clothed_male clothing comic comic_panel comic_sans digital_media dog domestic_dog english_text feral fontcest hoodie incest jacket lowest-of-dirt male male/male male_only monster pants_bulge papyrus_(font) papyrus_(undertale) papysans pinned_down sans_(undertale) seme_papyrus skeleton speech_bubble talking_to_another teeth text top_papyrus undead undertale undertale_(series) video_game_character video_games white_background yaoi
2017 2boys 2d animal animated_skeleton annoying_dog_(undertale) bottom_sans brother/brother brothers canid canine canis clothed clothed_male clothing comic comic_panel comic_sans digital_media dog domestic_dog english_text feral fontcest hoodie incest jacket lowest-of-dirt male male/male male_only monster pants_bulge papyrus_(font) papyrus_(undertale) papysans pinned_down sans_(undertale) seme_papyrus skeleton speech_bubble talking_to_another teeth text top_papyrus undead undertale undertale_(series) video_game_character video_games white_background yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother/brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male drooling duo ectotongue edit fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male long_image lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male third-party_edit tongue tongue_out top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother/brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male drooling duo ectotongue edit fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male long_image lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male third-party_edit tongue tongue_out top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother/brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male drooling duo ectotongue edit fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male long_image lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male tall_image third-party_edit tongue tongue_out top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother/brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male drooling duo ectotongue edit fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male long_image lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male tall_image third-party_edit tongue tongue_out top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother/brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male drooling duo ectotongue fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male tongue tongue_out top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother/brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male drooling duo ectotongue fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male tongue tongue_out top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male duo ectotongue fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2018 2boys 2d animated_skeleton arm_grab big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male biting biting_shoulder black_background bleeding blood blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chromatic_aberration clothed clothed/nude clothed_male clothing dark_background digital_media dominant dominant_male duo ectotongue fangs fontcest glowing glowing_eye incest intraspecies kneel larger_male lowest-of-dirt male male/male male_only maledom malesub monster nude nude_male orange_eye papyrus_(undertale) papysans sans_(undertale) sequence sequential sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom submissive submissive_male top_papyrus undead undertale undertale_(series) undertale_fanfiction video_game_character video_games yaoi
2010s 2017 2d 4boys animated_skeleton blue_blush blue_tongue blush bottom_sans bukkake clothed clothing cum cum_in_mouth cum_on_tongue digital_media ectotongue fangs finger_in_mouth fontcest gangbang grillby grillsans hand implied_incest lowest-of-dirt male male/male male_focus male_only monster multiple_boys one_eye_closed orange_cum orange_penis papyrus_(undertale) papysans penis red_background sans_(undertale) sanster seme_gaster seme_grillby seme_papyrus sex skeleton solo_focus tongue top_gaster top_grillby top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_game_character video_games w.d._gaster yaoi
2010s 2017 2d 4boys animated_skeleton blue_blush blue_tongue blush bottom_sans bukkake clothed clothing cum cum_in_mouth cum_on_tongue digital_media ectotongue fangs finger_in_mouth fontcest gangbang grillby grillsans hand implied_incest lowest-of-dirt male male/male male_focus male_only monster multiple_boys one_eye_closed orange_cum orange_penis papyrus_(undertale) papysans penis red_background sans_(undertale) sanster seme_gaster seme_grillby seme_papyrus sex skeleton solo_focus tongue top_gaster top_grillby top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face upper_body video_game_character video_games w.d._gaster yaoi
2017 2boys 2d animated_skeleton bottom_sans brother/brother brothers carrying carrying_partner carrying_position crying duo ectotongue fontcest incest interlocked_fingers intertwined_fingers licking licking_face lowest-of-dirt monster orange_tongue papyrus_(undertale) papysans sans_(undertale) seme_papyrus skeleton tongue top_papyrus traditional_media undead undertale undertale_(series) video_game_character video_games yaoi
2017 2boys 2d animated_skeleton bottom_sans brother/brother brothers carrying carrying_partner carrying_position crying duo ectotongue fontcest incest interlocked_fingers intertwined_fingers licking licking_face lowest-of-dirt monster orange_tongue papyrus_(undertale) papysans sans_(undertale) seme_papyrus skeleton tongue top_papyrus traditional_media undead undertale undertale_(series) 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
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
! ... 1other 2017 2boys 2d 3koma :v animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers comic comic_panel dialog dialogue dialogue_box digital_media duo english_text fontcest frisk_(undertale) gasp gay grabbing_arms grabbing_wrist human incest indoors larger_penetrating larger_penetrating_smaller lowest-of-dirt male male/male monster monster_boy nude on_floor open_door orange_blush papyrus_(undertale) papysans partially_colored penetration sans_(undertale) sex sex_on_floor sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom surprised text text_box top_papyrus undead undertale undertale_(series) video_game_character video_games walk-in yaoi
! ... 1other 2017 2boys 2d 3koma :v animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers comic comic_panel dialog dialogue dialogue_box digital_media duo english_text fontcest frisk_(undertale) gasp gay grabbing_arms grabbing_wrist human incest indoors larger_penetrating larger_penetrating_smaller lowest-of-dirt male male/male monster monster_boy nude on_floor open_door orange_blush papyrus_(undertale) papysans partially_colored penetration sans_(undertale) sex sex_on_floor sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom surprised text text_box top_papyrus undead undertale undertale_(series) video_game_character video_games walk-in yaoi
1:1 1:1_aspect_ratio 2019 2boys 2d accurate_art_style anal animated_skeleton animation blue_blush blush bottom_sans bottomless brothers digital_media disembodied_penis edit fontcest incest jacket looping_animation lowest-of-dirt lowres male male_focus male_only moaning no_pants no_sound orange_penis papyrus_(undertale) papysans penetration penis pixel_art pleasure_face sans_(undertale) short_playtime shorter_than_10_seconds skeleton slippers solo_focus thrusting top_papyrus undead undertale undertale_(series) video video_game_character video_games webm yaoi
1:1 1:1_aspect_ratio 2019 2boys 2d accurate_art_style anal animated_skeleton animation blue_blush blush bottom_sans bottomless brothers digital_media disembodied_penis edit fontcest incest jacket looping_animation lowest-of-dirt lowres male male_focus male_only moaning no_pants no_sound orange_penis papyrus_(undertale) papysans penetration penis pixel_art pleasure_face sans_(undertale) short_playtime shorter_than_10_seconds skeleton slippers solo_focus thrusting top_papyrus undead undertale undertale_(series) video video_game_character video_games webm 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 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
2019 2boys 2d animated_skeleton artist_logo blush bottom_sans bukkake clothed clothing cum cum_on_face digital_media lowest-of-dirt male male_only monochrome penis sans_(undertale) skeleton solo_focus undead undertale undertale_(series) video_game_character video_games yaoi
2019 2boys 2d animated_skeleton artist_logo blush bottom_sans bukkake clothed clothing cum cum_on_face digital_media lowest-of-dirt male male_only monochrome penis sans_(undertale) skeleton solo_focus undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2019 2boys 2d accurate_art_style anal animated animated_gif animated_skeleton animation blue_blush blush bottom_sans bottomless bottomless_male brothers digital_media disembodied_penis fontcest gif incest jacket looping_animation lowest-of-dirt lowres male male_focus male_only male_penetrating moaning no_pants orange_penis papyrus_(undertale) papysans penetration penis pixel_art pleasure_face sans_(undertale) skeleton slippers solo_focus thrusting top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2019 2boys 2d accurate_art_style anal animated animated_gif animated_skeleton animation blue_blush blush bottom_sans bottomless bottomless_male brothers digital_media disembodied_penis fontcest gif incest jacket looping_animation lowest-of-dirt lowres male male_focus male_only male_penetrating moaning no_pants orange_penis papyrus_(undertale) papysans penetration penis pixel_art pleasure_face sans_(undertale) skeleton slippers solo_focus thrusting top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2017 2boys 2d animated_skeleton big_penis blue_eye bottom_sans brother/brother brothers digital_media duo fellatio fontcest gay incest lowest-of-dirt male male/male male_only male_out_of_frame monster oral orange_penis papyrus_(undertale) papysans penis penis_in_mouth sans_(undertale) skeleton solo_focus sucking_penis top_papyrus undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2017 2boys 2d animated_skeleton big_penis blue_eye bottom_sans brother/brother brothers digital_media duo fellatio fontcest gay incest lowest-of-dirt male male/male male_only male_out_of_frame monster oral orange_penis papyrus_(undertale) papysans penis penis_in_mouth sans_(undertale) skeleton solo_focus sucking_penis top_papyrus undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2017 2boys 2d 2d_animation animated animated_gif animated_skeleton animation big_penis blue_eye bottom_sans brother/brother brothers digital_media duo fellatio fontcest gay gif incest looping_animation lowest-of-dirt male male/male male_only male_out_of_frame oral orange_penis papyrus_(undertale) papysans partially_colored penis sans_(undertale) sibling_incest skeleton solo_focus sucking_penis top_papyrus undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2017 2boys 2d 2d_animation animated animated_gif animated_skeleton animation big_penis blue_eye bottom_sans brother/brother brothers digital_media duo fellatio fontcest gay gif incest looping_animation lowest-of-dirt male male/male male_only male_out_of_frame oral orange_penis papyrus_(undertale) papysans partially_colored penis sans_(undertale) sibling_incest skeleton solo_focus sucking_penis top_papyrus undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi