Rule 34 Dev - 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush brother brother/brother brother_and_brother brothers clothed comic_sans digital_media_(artwork) duo ectotongue english_text eyeless eyeless_male fontcest gloves heki_(miss60250) hoodie incest intraspecies licking licking_tongue making_out male male/male male_only monster monster_boy orange_blush orange_tongue papyrus papyrus_(undertale) papysans red_gloves sans sans_(undertale) sibling_incest siblings skeleton text tongue twitter undead undertale undertale_(series) upper_body video_game_character video_games yaoi|1013952