Rule 34 Dev - >:( 2020 2boys 2d animated_skeleton ass ass_slap bottom_sans brother/brother brothers clothed clothed_male couch dated digital_media duo fontcest furniture gay gloves humanoid incest intraspecies japanese_text lying male male/male monster on_couch on_stomach papyrus_(undertale) papysans red_gloves sans_(undertale) sibling_incest siblings sitting skeleton slapping_ass spanking spanking_ass spanking_butt teeth text top_papyrus undead undertale undertale_(series) yaoi yoshityama2|1022030

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