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...2010s 2018 2boys 2d 2d_(artwork)after_sex aftersex animated_skeleton ass blue_background blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers cleaning clothed clothed/nude clothed_male_nude_male clothing completely_nude completely_nude_male cum cum_leaking digital_media_(artwork)duo ectopenis ectoplasm ectopussy english_text erection fluids fontcest genital_fluids genitals humanoid implied_after_sex incest intraspecies laying_on_back lying_on_back male male/male male_focus male_only mianpigui_(wqw1201501125)monster monster_boy nude nude_male one_eye_closed orange_blush pants papyrus papyrus_(undertale)papysans penis pussy sans sans_(undertale)seme_papyrus semen sibling_incest siblings skeleton small_penis spoken_ellipsis sweat text tissue tissue_box tissue_paper top_papyrus uke_sans undead undertale undertale_(series)video_game_character video_games yaoi

... 2010s 2018 2boys 2d 2d_(artwork) after_sex aftersex animated_skeleton ass blue_background blue_blush blue_penis blush blush_lines bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers cleaning clothed clothed/nude clothed_male_nude_male clothing completely_nude completely_nude_male cum cum_leaking digital_media_(artwork) duo ectopenis ectoplasm ectopussy english_text erection fluids fontcest genital_fluids genitals humanoid implied_after_sex incest intraspecies laying_on_back lying_on_back male male/male male_focus male_only mianpigui_(wqw1201501125) monster monster_boy nude nude_male one_eye_closed orange_blush pants papyrus papyrus_(undertale) papysans penis pussy sans sans_(undertale) seme_papyrus semen sibling_incest siblings skeleton small_penis spoken_ellipsis sweat text tissue tissue_box tissue_paper top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi

2010s 2018 2boys 2d 2d_(artwork) ambiguous_penetration anal anal_penetration anal_sex animated_skeleton ass black_background blue_penis bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dark_background duo ectopenis ectoplasm ectopussy erection fontcest humanoid incest intraspecies kissing leg_grab leg_up male male/male male_focus male_only male_penetrating mianpigui_(wqw1201501125) monster monster_boy on_side papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis pussy red_scarf sans sans_(undertale) scarf seme_papyrus sex shirt_up sibling_incest siblings simple_background skeleton sweat top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi