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1boy 2010s 2016 2d 2d_(artwork) after_autofellatio after_oral alkipunch alternate_version_available animated_skeleton artist_name ass autofellatio blue_blush blue_penis blue_tongue blush blushing bone closed_eyes clothed clothing cum cum_on_face cum_on_own_face cum_on_self cumshot digital_media_(artwork) ectopenis ectotongue ejaculation erection fangs forked_tongue genitals grabbing_sheets gripping_sheets highres hooded_jacket hoodie jacket male male_masturbation male_only masturbation monster open_mouth orgasm penis sans sans_(undertale) sequence sequential skeleton sneakers solo solo_male sweat third-party_source tongue undead undertale undertale_(series) video_game_character video_games