Xbooru - 2010s 2boys anal animated skeleton bigger male bigger penetrating bigger penetrating smaller blush blush lines bottom on top bottom sans brother brother/brother brother and brother brother penetrating brother brothers clothed clothing collar comic comic page comic panel eli-sin-g english text fangs fontcest incest intraspecies kolesjoie larger male larger penetrating larger penetrating smaller male male/male male only male penetrated male penetrating male penetrating male monster monster boy papyrus papyrus (undertale) papysans penetration sans sans (undertale) seme papyrus sequence sequential service top sex sibling incest siblings skeleton smaller male smaller penetrated speech bubble sweat text text bubble top papyrus uke sans undead undertale undertale (series) yaoi | 1029567

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2010s 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blush blush_lines bottom_on_top bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing collar comic comic_page comic_panel eli-sin-g english_text fangs fontcest incest intraspecies kolesjoie larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sequence sequential service_top sex sibling_incest siblings skeleton smaller_male smaller_penetrated speech_bubble sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) yaoi

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