Rule 34 Dev - 1:1 1:1_aspect_ratio 2010s 2019 2d 2d_(artwork) animated_skeleton blanket blue_blush blush bottom_sans brother brother_and_brother brothers cum cum_in_mouth digital_media_(artwork) dream dreaming duo fontcest groping incest intraspecies male monster monster_boy nightcap orange_cum orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pillow pinned sans sans_(undertale) seme_papyrus shirt_lift sibling_incest siblings simple_background skeleton sympharin symphysins tentacle tentacle_sex top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games wet_dream white_background yaoi|1012882