Rule 34 Dev - 1boy 2010s 2016 2d 2d_(artwork) animated_skeleton artist_name blue_blush blue_eyes blue_penis blush blushing clothed cyan_eyes digital_media_(artwork) doiduh ectopenis fully_clothed male male_masturbation male_only masturbation monster monster_boy on_bed penile penile_masturbation penis sans sans_(undertale) sitting sitting_on_bed skeb_commission skeleton solo_male undead undertale undertale_(series) video_game_character video_games|861323