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2010s 2015 2boys 2d 2d_(artwork) animated_skeleton bad_id bad_tumblr_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_penis bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed/nude digital_media_(artwork) duo ectopenis fontcest gay grabbing_from_behind grabbing_mouth inactive_account incest larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy noxiousaberration nude open_mouth orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
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2010s 2018 2boys 2d animated_skeleton bad_id bad_tumblr_id bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_tongue blush bottom_sans dark_background digital_media_(artwork) duo elemental_creature elemental_humanoid fire_elemental gay grillby grillsans heart-shaped_pupils heart_eyes hugging humanoid indoors larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating mellednsfw monster monster_boy muscular muscular_male nude nude_male orange_body penetration sans sans_(undertale) seme_grillby sex sitting sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat tongue tongue_out top_grillby uke_sans undead undertale undertale_(series) yaoi
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2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_male digital_media_(artwork) drooling duo facing_another fontcest incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex sinfulsanspar sitting_on_another sitting_position skeleton sketch small_shirt small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
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>:o 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton apron bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brothers cussing digital_media_(artwork) duo english_text fontcest gloves grabbing_another's_chin grabbing_face hooded_jacket hoodie implied_incest inactive_account indoors jacket larger_male male monster orange_apron papyrus papyrus_(undertale) papysans profanity red_gloves red_sweater sans sans_(undertale) seme_papyrus skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing sweat sweater text top_papyrus twitter_username uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
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1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) doggy_position duo ectoplasm finger_in_mouth fingers_in_mouth fontcest from_behind_position grabbing_from_behind grey_background incest intraspecies larger_male larger_penetrating male male/male male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy off_shoulder orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
2boys animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans bottomless bottomless_male brother/brother brothers cum_on_face dinogirl69 duo ectopenis ectotongue fangs fontcest frottage frotting gay incest intraspecies larger_male male male/male male_only monster monster_boy outercourse papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis penis_on_penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
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2010s 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_tongue blush bottom_sans bottomless bottomless_male clothed duo ectotongue elemental_creature elemental_humanoid fire_elemental gay grillby grillsans humanoid ladybumtickler larger_male larger_penetrating larger_penetrating_smaller male male/male male_only monster monster_boy orange_body orange_penis partially_clothed partially_clothed_male penis sans sans_(undertale) seme_grillby sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sniggysmut third-party_source top_grillby uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_tongue blush bottom_sans bottomless bottomless_male clothed duo ectotongue elemental_creature elemental_humanoid fire_elemental gay grillby grillsans humanoid ladybumtickler larger_male larger_penetrating larger_penetrating_smaller male male/male male_only monster monster_boy orange_body orange_penis partially_clothed partially_clothed_male penis sans sans_(undertale) seme_grillby sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sniggysmut third-party_source top_grillby uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
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2020s 2023 animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blush bonetrouble bottom_sans bottomless brother_penetrating_brother brothers clothed duo ectotongue fontcest grabbing_arms grabbing_from_behind incest larger_male larger_penetrating male male/male male_only male_penetrating monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus traditional_art traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_name big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis blue_tongue blush bonetrouble bottom_sans brother brother/brother brother_and_brother brothers clothed_male crying drawn drooling erect_penis erection erection_under_clothes fontcest handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_name big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis blue_tongue blush bonetrouble bottom_sans brother brother/brother brother_and_brother brothers clothed_male crying drawn drooling erect_penis erection erection_under_clothes fontcest handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_eyes blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying carrying_another carrying_partner carrying_position clothed clothed_sex dakuyakko duo ectopenis erection fontcest genitals heart-shaped_pupils heart_eyes incest intraspecies larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus stand_and_carry_position third-party_source top_papyrus tumblr_username uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_eyes blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying carrying_another carrying_partner carrying_position clothed clothed_sex dakuyakko duo ectopenis erection fontcest genitals heart-shaped_pupils heart_eyes incest intraspecies larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus stand_and_carry_position third-party_source top_papyrus tumblr_username uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
1boy 1cuntboy 2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clitoris comic comic_page comic_panel cuntboy cuntboy_penetrated digital_media_(artwork) duo ectopenis ectopussy eli-sin-g english_text fontcest from_front_position genitals incest intraspecies kolesjoie larger_male larger_penetrating male male/cuntboy male_focus male_penetrating male_penetrating_cuntboy monochrome monster monster_boy on_counter onomatopoeia orange_penis papyrus papyrus_(undertale) papysans penetration penis pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus uke_sans undead undertale undertale_(series) vaginal video_game_character video_games yaoi
1boy 1cuntboy 2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_clitoris blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clitoris comic comic_page comic_panel cuntboy cuntboy_penetrated digital_media_(artwork) duo ectopenis ectopussy eli-sin-g english_text fontcest from_front_position genitals incest intraspecies kolesjoie larger_male larger_penetrating male male/cuntboy male_focus male_penetrating male_penetrating_cuntboy monochrome monster monster_boy on_counter onomatopoeia orange_penis papyrus papyrus_(undertale) papysans penetration penis pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus uke_sans undead undertale undertale_(series) vaginal video_game_character video_games yaoi
1boy almost_caught animated_skeleton anthro big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel ectopenis eli-sin-g english_text female fontcest frisk frisk_(undertale) from_front_position grabbing_leg human incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab male male_focus male_penetrating monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus toriel uke_sans undead undertale undertale_(series) unseen_character yaoi
1boy almost_caught animated_skeleton anthro big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel ectopenis eli-sin-g english_text female fontcest frisk frisk_(undertale) from_front_position grabbing_leg human incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab male male_focus male_penetrating monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus toriel uke_sans undead undertale undertale_(series) unseen_character yaoi
3girls alphys animated_skeleton anthro big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_page comic_panel dinosaur dinosaur_girl eli-sin-g english_text female female_anthro fontcest frisk frisk_(undertale) from_behind_position grabbing_arms grabbing_from_behind human incest intraspecies kitchen kolesjoie larger_male larger_penetrating lizard lizard_girl male male_focus male_penetrating monochrome monster monster_boy monster_girl papyrus papyrus_(undertale) papysans penetration penetration_from_behind reptile reptile_girl sans sans_(undertale) scalie scalie_female seme_papyrus sequence sequential sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus toriel uke_sans undead undertale undertale_(series) undyne yaoi
3girls alphys animated_skeleton anthro big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_page comic_panel dinosaur dinosaur_girl eli-sin-g english_text female female_anthro fontcest frisk frisk_(undertale) from_behind_position grabbing_arms grabbing_from_behind human incest intraspecies kitchen kolesjoie larger_male larger_penetrating lizard lizard_girl male male_focus male_penetrating monochrome monster monster_boy monster_girl papyrus papyrus_(undertale) papysans penetration penetration_from_behind reptile reptile_girl sans sans_(undertale) scalie scalie_female seme_papyrus sequence sequential sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus toriel uke_sans undead undertale undertale_(series) undyne yaoi
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed crazy_eyes crazy_smile digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot mettasans mettaton mettaton_ex monster onomatopoeia punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk spanking spanking_ass spanking_butt sweat text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed crazy_eyes crazy_smile digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot mettasans mettaton mettaton_ex monster onomatopoeia punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk spanking spanking_ass spanking_butt sweat text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
... 2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text glowing_eye hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
... 2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text glowing_eye hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans digital_media_(artwork) hair hoodie humanoid humanoid_robot larger_male male male/male male_only maledom mettasans mettaton mettaton_ex monster penis robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games wearing_others_clothes yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans digital_media_(artwork) hair hoodie humanoid humanoid_robot larger_male male male/male male_only maledom mettasans mettaton mettaton_ex monster penis robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games wearing_others_clothes yaoi
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2010s 2015 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots bottom_sans box digital_media_(artwork) dominant dominant_male domination english_text footwear glowing_eyes hair hair_over_one_eye high_heel_boots humanoid humanoid_robot larger_male licking licking_leg male male/male male_only maledom malesub mettasans mettaton mettaton_ex monster nude nude_male penis pink_boots pink_eyes pink_glans pink_high_heel_boots pink_tongue robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton shoes simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male text tongue top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
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2020s 2023 2boys 2d 2d_(artwork) anal animated_skeleton arm_grab big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blush blush_lines boots bottom_sans bottomless bottomless_male brother/brother brother_and_brother brother_penetrating_brother brothers cussing dirty_talk drooling duo ectopenis english_text fontcest from_behind_position genital_fluids genitals gloves grabbing_arms grabbing_from_behind hi_res high_res highres humanoid incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating male_penetrating_male monochrome monster monster_boy nude nude_male onomatopoeia pants_around_one_leg papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penetration_from_behind penis penis_size_difference prison_guard_position profanity sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background size_difference skeleton sketch small_penis small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom swearing talking_to_another talking_to_partner text thrusting tired_but_horny_(artist) top_papyrus twitter uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2020 2020s 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans crying crying_with_eyes_open darkner deltarune deltarune_chapter_1 duo gay king_spade larger_male male/male male_only monster non-con non-consensual noncon nonconsensual nude nude_male sans sans_(undertale) size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus stomach_mouth sympharin symphysins tears uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
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2020 2020s 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed darkner deltarune deltarune_chapter_1 duo gay imminent_rape king_spade larger_male male/male male_only monster non-con non-consensual noncon nonconsensual sans sans_(undertale) size_difference skeleton sketch small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom stomach_mouth sympharin symphysins uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
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2020s 2022 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_tongue bodily_fluids boner_blossom bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers crying crying_with_eyes_open digital_media_(artwork) drooling duo ectopenis ectoplasm english_text fluids fontcest gay heart-shaped_pupils heart_eyes 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 papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis rape safeword sans sans_(undertale) seme_papyrus 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 twitter_username uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
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2020 2020s 2boys 2d 2d_(artwork) anal animated_skeleton big_cock big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_border blue_blush blush boner_blossom bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers carrying carrying_partner chair clothed comic_sans commission_art covering_another's_mouth covering_mouth digital_media_(artwork) drooling duo ectoplasm english_text fontcest gay humanoid incest intraspecies larger_male larger_penetrating male male/male male_penetrating moaning monster monster_boy orange_blush outdoor_sex outdoors pants pants_around_one_leg papyrus papyrus_(font) papyrus_(undertale) papysans penetration public_sex reverse_suspended_congress sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting sitting_on_chair skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble sweat text text_bubble top_papyrus twitter twitter_username uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
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2020s 2021 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bottom_sans brother/brother brother_penetrating_brother brothers cussing duo ectopenis english_text fontcest gay grabbing_head head_grab heart-shaped_pupils heart_eyes humanoid incest intraspecies irrumatio larger_male larger_penetrating male male/male male_penetrating monochrome monster monster_boy multiple_views papyrus papyrus_(undertale) papysans penetration penis profanity pushing_head_towards_fellatio sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton sketch sleeping small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom swearing text tired_but_horny_(artist) top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi zzz