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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

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 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