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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
>: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
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) doggy_position duo ectoplasm finger_in_mouth fingers_in_mouth fontcest from_behind_position grabbing_from_behind grey_background incest intraspecies larger_male larger_penetrating male male/male male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy off_shoulder orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) doggy_position duo ectoplasm finger_in_mouth fingers_in_mouth fontcest from_behind_position grabbing_from_behind grey_background incest intraspecies larger_male larger_penetrating male male/male male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy off_shoulder orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
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
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
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
2023 2boys 2d 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 humanoid incest larger_male larger_penetrating male male/male male_only male_penetrating monster orange_blush papyrus_(undertale) papysans penetration sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus traditional_media undead undertale undertale_(series) yaoi
2023 2boys 2d 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 humanoid incest larger_male larger_penetrating male male/male male_only male_penetrating monster orange_blush papyrus_(undertale) papysans penetration sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus traditional_media 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 erection erection_under_clothes fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_name big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis blue_tongue blush bonetrouble bottom_sans brother brother/brother brother_and_brother brothers clothed_male crying drawn drooling erection erection_under_clothes fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 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 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 digital_media_(artwork) duo ectopenis ectopussy eli-sin-g english_text fontcest from_front_position genitals humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid 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_(undertale) papysans penetration penis pussy refrigerator sans_(undertale) 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 top_papyrus undead undertale undertale_(series) unseen_character vaginal video_game_character video_games yaoi
1boy 1cuntboy 2d 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 digital_media_(artwork) duo ectopenis ectopussy eli-sin-g english_text fontcest from_front_position genitals humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid 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_(undertale) papysans penetration penis pussy refrigerator sans_(undertale) 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 top_papyrus undead undertale undertale_(series) unseen_character vaginal video_game_character video_games yaoi
1boy 1cuntboy 1other 2d 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_penetrating_brother brothers clothed comic comic_page comic_panel digital_media ectopenis eli-sin-g english_text female fontcest frisk_(undertale) from_front_position grabbing_leg human humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab male male_focus male_penetrating monochrome monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans penetration refrigerator sans_(undertale) 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 top_papyrus toriel undead undertale undertale_(series) undyne unseen_character unseen_female_face yaoi
1boy 1cuntboy 1other 2d 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_penetrating_brother brothers clothed comic comic_page comic_panel digital_media ectopenis eli-sin-g english_text female fontcest frisk_(undertale) from_front_position grabbing_leg human humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab male male_focus male_penetrating monochrome monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans penetration refrigerator sans_(undertale) 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 top_papyrus toriel undead undertale undertale_(series) undyne unseen_character unseen_female_face yaoi
1boy 1cuntboy 1other 2d 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_penetrating_brother brothers comic comic_page comic_panel digital_media dinosaur dinosaur_girl eli-sin-g english_text female female_anthro fontcest frisk_(undertale) from_behind_position grabbing_arms grabbing_from_behind human humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest intraspecies kitchen kolesjoie larger_male larger_penetrating lizard lizard_girl male male_focus male_penetrating monochrome monster monster_boy monster_girl multiple_girls papyrus_(undertale) papysans penetration penetration_from_behind reptile reptile_girl sans_(undertale) scalie scalie_female 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 top_papyrus toriel undead undertale undertale_(series) undyne yaoi
1boy 1cuntboy 1other 2d 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_penetrating_brother brothers comic comic_page comic_panel digital_media dinosaur dinosaur_girl eli-sin-g english_text female female_anthro fontcest frisk_(undertale) from_behind_position grabbing_arms grabbing_from_behind human humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest intraspecies kitchen kolesjoie larger_male larger_penetrating lizard lizard_girl male male_focus male_penetrating monochrome monster monster_boy monster_girl multiple_girls papyrus_(undertale) papysans penetration penetration_from_behind reptile reptile_girl sans_(undertale) scalie scalie_female 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 top_papyrus toriel 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
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots bottom_sans box digital_media_(artwork) dominant dominant_male domination english_text footwear glowing_eyes hair hair_over_one_eye high_heel_boots humanoid humanoid_robot larger_male licking licking_leg male male/male male_only maledom malesub mettasans mettaton mettaton_ex monster nude nude_male penis pink_boots pink_eyes pink_glans pink_high_heel_boots pink_tongue robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton shoes simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male text tongue top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots bottom_sans box digital_media_(artwork) dominant dominant_male domination english_text footwear glowing_eyes hair hair_over_one_eye high_heel_boots humanoid humanoid_robot larger_male licking licking_leg male male/male male_only maledom malesub mettasans mettaton mettaton_ex monster nude nude_male penis pink_boots pink_eyes pink_glans pink_high_heel_boots pink_tongue robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton shoes simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male text tongue top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
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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
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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2020 2020s 2boys 2d anal animated_skeleton 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 covering_another's_mouth covering_mouth digital_media 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_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
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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 bondage bottom_sans brother brothers clothed digital_media_(artwork) duo eggford erection erection_under_clothes fontcest genital_fluids incest kneel kneeling looking_at_another looking_back looking_back_at_another male male/male male_only monster orange_background papyrus papyrus_(undertale) papysans partial_male penis precum precum_through_clothing sans sans_(undertale) seme_papyrus simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solo_focus tied_up top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games 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 bigger_penetrating bigger_penetrating_smaller blue_background blue_penis bottom_sans brother_penetrating_brother brothers clothed clothed/nude digital_media_(artwork) duo duplicate ectopenis fontcest gay grabbing_from_behind grabbing_mouth incest larger_male larger_penetrating larger_penetrating_smaller male male/male 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 uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
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1:1 1:1_aspect_ratio 1girl 1girl2boys 2020 2020s 2boys 2boys1girl 2boys_1girl 2d 2d_(artwork) anon anonymous_male anthro anthro_penetrating asgore_dreemurr assisted_sex big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_male bigger_penetrating bigger_penetrating_smaller bisexual bisexual_male black_legwear black_stockings black_thighhighs boss_monster caprine dominant_anthro drooling english_text female_anthro furry furry_female furry_male goat horns larger_anthro larger_female larger_male larger_penetrating larger_penetrating_smaller licking_lips male/male/female male_anthro male_penetrating male_penetrating_male mmf_threesome moaning nude penetration penis seme_asgore sex simple_background small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stockings text thighhighs threesome tired_but_horny_(artist) top_asgore toriel trio twitter twitter_username undertale undertale_(series) video_game_character video_games white_fur
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2boys 2d 2d_(artwork) animated_skeleton 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 cropped crying drawn drooling edited erection fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton 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 cropped crying drawn drooling edited erection fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
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2010s 2016 2boys 2d 2d_(artwork) against_wall anal animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck artist_name backwards_hat big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_male bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_penis blue_saliva bluetrashsins blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers cap carrying carrying_partner carrying_position digital_media_(artwork) drooling duo ectopenis fontcest gay genitals glowing glowing_eye glowing_penis hands_around_neck hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_blush orange_penis orange_saliva papyrus papyrus_(undertale) papysans penetration red_cap sans sans_(undertale) seme_papyrus sex shirt_only sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stand_and_carry_position suspended_congress tears top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games wall_sex yaoi