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! ... 2010s 2017 2boys 2d 2d_(artwork) 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_(artwork) duo english_text fontcest frisk frisk_(undertale) gasp gay grabbing_arms grabbing_wrist human incest indoors larger_penetrating larger_penetrating_smaller lowest-of-dirt lowest_of_dirt male male/male monster monster_boy nude on_floor open_door orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration sans sans_(undertale) seme_papyrus sex sex_on_floor sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom surprised surprised_expression text text_box top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games walk-in yaoi

!...2010s 2017 2boys 2d 2d_(artwork)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_(artwork)duo english_text fontcest frisk frisk_(undertale)gasp gay grabbing_arms grabbing_wrist human incest indoors larger_penetrating larger_penetrating_smaller lowest-of-dirt lowest_of_dirt male male/male monster monster_boy nude on_floor open_door orange_blush papyrus papyrus_(undertale)papysans partially_colored penetration sans sans_(undertale)seme_papyrus sex sex_on_floor sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom surprised surprised_expression text text_box top_papyrus tumblr uke_sans undead undertale undertale_(series)video_game_character video_games walk-in yaoi

! ... 2010s 2017 2boys 2d 2d_(artwork) 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_(artwork) duo english_text fontcest frisk frisk_(undertale) gasp gay grabbing_arms grabbing_wrist human incest indoors larger_penetrating larger_penetrating_smaller lowest-of-dirt lowest_of_dirt male male/male monster monster_boy nude on_floor open_door orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration sans sans_(undertale) seme_papyrus sex sex_on_floor sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom surprised surprised_expression text text_box top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games walk-in yaoi

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1girl aeolus big_breasts black_hair book books cleavage female_only freckles funny glasses huge_breasts long_hair mad nerd nerdy_female open_door original original_character ponytail twin_tails