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2016 against_surface anus anus_on_glass ass_on_glass backsack badsheep balls balls_on_glass butt digital_media_(artwork)digitigrade dota genitals glass grey_background grin heart_symbol looking_at_viewer looking_back male monochrome on_glass on_surface open_mouth penis perineum presenting presenting_hindquarters puffy_anus raised_tail rear_view simple_background slark_the_nightcrawler smile solo tail tail_tuft tuft valve valve_corporation