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2015 aaron_(artist)abstract_background anthro biceps biped black_border border briefs brown_body brown_skin bulge clothed clothing common_hippopotamus erection flexing grin hands_behind_head hi_res hippopotamid jockstrap looking_at_viewer male mammal markings muscular muscular_anthro muscular_male partially_clothed pose shirt simple_background smile solo spots standing teeth topwear underwear wide_hips yellow_eyes