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4_toes anthro anus aquatic balls black_body black_scales brown_pawpads butt crobat_(artist)curling_toes digitigrade duo erection feet fish genitals grey_body grey_scales hair horn humanoid_genitalia humanoid_penis imminent_sex lying male nude on_back orange_hair pawpads penis perineum plantigrade purple_pawpads scales shark signature smile soles spread_legs spreading toes