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1girl 2010s 2018 2boys alphys animated_skeleton anthro big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers buckteeth comic comic_panel comic_sans dinosaur dinosaur_girl ectopenis english_text fallen9choirs female female_anthro fontcest furniture gay genitals incest indoors intraspecies kotatsu larger_penetrating larger_penetrating_smaller lizard lizard_girl male male/male male_penetrated male_penetrating male_penetrating_male monster monster_boy monster_girl orange_blush orange_penis papyrus papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_size_difference reptile reptile_girl sans sans_(undertale) scalie scalie_female seme_papyrus sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex text text_bubble top_papyrus trio uke_sans undead undertale undertale_(series) yaoi yellow_body yellow_skin

1girl 2010s 2018 2boys alphys animated_skeleton anthro big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers buckteeth comic comic_panel comic_sans dinosaur dinosaur_girl ectopenis english_text fallen9choirs female female_anthro fontcest furniture gay genitals incest indoors intraspecies kotatsu larger_penetrating larger_penetrating_smaller lizard lizard_girl male male/male male_penetrated male_penetrating male_penetrating_male monster monster_boy monster_girl orange_blush orange_penis papyrus papyrus_(font)papyrus_(undertale)papysans penetration penetration_through_clothes penis penis_size_difference reptile reptile_girl sans sans_(undertale)scalie scalie_female seme_papyrus sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex text text_bubble top_papyrus trio uke_sans undead undertale undertale_(series)yaoi yellow_body yellow_skin

1girl 2010s 2018 2boys alphys animated_skeleton anthro big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers buckteeth comic comic_panel comic_sans dinosaur dinosaur_girl ectopenis english_text fallen9choirs female female_anthro fontcest furniture gay genitals incest indoors intraspecies kotatsu larger_penetrating larger_penetrating_smaller lizard lizard_girl male male/male male_penetrated male_penetrating male_penetrating_male monster monster_boy monster_girl orange_blush orange_penis papyrus papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_size_difference reptile reptile_girl sans sans_(undertale) scalie scalie_female seme_papyrus sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex text text_bubble top_papyrus trio uke_sans undead undertale undertale_(series) yaoi yellow_body yellow_skin

2010s 2018 3koma animated_skeleton bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers comic comic_panel comic_sans couch drooling duo ectopenis elbow_gloves english_text fallen9choirs fontcest furniture gay gloves incest larger_penetrating larger_penetrating_smaller long_gloves male male/male male_only male_penetrating male_penetrating_male monster monster_boy on_back orange_blush orange_penis papyrus papyrus_(font) papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration power_bottom red_gloves red_scarf sans sans_(undertale) scarf seme_papyrus sex sibling_incest siblings skeleton smaller_penetrated speech_bubble sweat text text_bubble thought_bubble top_papyrus topwear uke_sans undead undertale undertale_(series) yaoi

2010s 2boys 2d 2d_(artwork) anal animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_penis blush boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male clothed_sex comic_sans cuddle cuddle_sex cum cum_inside digital_media_(artwork) duo ectopenis ejaculation english_text fluids fontcest footwear gay genital_fluids genitals gloves hoodie hugged_from_behind hugging hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller lying_down lying_on_back male male/male male_masturbation male_only male_penetrated male_penetrating male_penetrating_male masturbating_while_penetrated masturbation monster monster_boy multiple_ejaculation multiple_orgasms orange_blush orange_penis papyrus papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penile penile_masturbation penis penis_out penis_through_clothing pink_slippers red_boots red_gloves sans sans_(undertale) seme_papyrus sex sex_through_clothes sex_through_clothing shoes shoes_on sibling_incest siblings skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom source_request spread_legs third-party_source top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi