Rule 34 Dev - 2015 2boys 2d animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck artist_name blue_blush blue_eye blue_tongue blush brother/brother brothers digital_media duo ectotongue fontcest gay glowing glowing_eye heart-shaped_pupils heart_eyes humanoid incest intraspecies laddinger making_out male male/male male_only monster monster_boy nude nude_male onomatopoeia orange_blush orange_eye orange_tongue papyrus_(undertale) papysans ribs sans_(undertale) sibling_incest siblings simple_background skeleton sweat teeth text undead undertale undertale_(series) upper_body watermark white_background yaoi|1024548

nproxy.org