Rule 34 Dev - 2010s 2016 2boys 2d 2d_(artwork) animated_skeleton anon anonymous anonymous_male blue_tongue bone bottom_sans digital_media_(artwork) disembodied_penis duo genitals grey_background licking licking_penis male male/male male_only nubs oral penis safetytrance sans sans_(undertale) sex simple_background skeleton solid_color_background solo_focus text third-party_source tongue uke_sans undead undertale undertale_(series) unseen_character unseen_male_face video_games yaoi|1023952

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