Rule 34 Dev - 1:1 1:1_aspect_ratio 1boy 2010s 2016 2d 2d_(artwork) animated_skeleton bedroom blue_blush blue_hoodie blue_jacket blue_penis blush clothed clothing covering_mouth covering_own_mouth dark dark_room digital_media_(artwork) ectopenis fully_clothed glowing glowing_genitalia glowing_penis hand_on_mouth hooded_jacket hoodie indoors jacket male male_focus male_masturbation male_only masturbation monster one_eye_closed penile_masturbation penis pink_slippers sans sans_(undertale) sitting skeleton slippers small_penis solo_male spontaneouslynsfw sweat tumblr undead undertale undertale_(series) video_game_character video_games|1032722