Rule 34 Dev - 2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bed bedroom blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chinese_text clothed comic digital_media_(artwork) duo ectotongue edit edited fontcest gay incest indoors interlocked_fingers intertwined_fingers intraspecies long_image making_out male male/male male_only monochrome monster monster_boy multiple_images on_bed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_colored saliva_trail sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton tall_image text text_bubble third-party_edit top_papyrus tumblr uke_sans undead undertale undertale_(series) veah-3sin video_games yaoi|1026131