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2010s 2018 2boys 2d 2d_(artwork)anal anal_penetration anal_sex animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blush blush_lines bodily_fluids bodysuit bottom_sans bottomless bottomless_male bottomwear brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm fluids fontcest humanoid incest intraspecies laying_on_back leg_grab legs_apart legs_spread lying_on_back male male/male male_focus male_only male_penetrating male_pov mianpigui_(wqw1201501125)monster monster_boy orange_penis papyrus papyrus_(undertale)papysans partial_male partially_clothed penetrating_pov penetration penetrator_pov penis pillow pov sans sans_(undertale)seme_papyrus sex sibling_incest siblings sitting skeleton solo_focus tissue tissue_paper top_papyrus topwear uke_sans undead undertale undertale_(series)unseen_male_face used_tissue video_games visible_breath yaoi

2010s 2018 2boys 2d 2d_(artwork) anal anal_penetration anal_sex animated_skeleton armwear ass black_armwear black_bodysuit black_bottomwear black_topwear blue_blush blush blush_lines bodily_fluids bodysuit bottom_sans bottomless bottomless_male bottomwear brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing duo ectopenis ectoplasm fluids fontcest humanoid incest intraspecies laying_on_back leg_grab legs_apart legs_spread lying_on_back male male/male male_focus male_only male_penetrating male_pov mianpigui_(wqw1201501125) monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male partially_clothed penetrating_pov penetration penetrator_pov penis pillow pov sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting skeleton solo_focus tissue tissue_paper top_papyrus topwear uke_sans undead undertale undertale_(series) unseen_male_face used_tissue video_games visible_breath yaoi

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