animal_genitalia anthro anus bara barazoku big_penis black_body butt coral_reef fin gaping gaping_anus genital_slit genitals gills male muscular muscular_anthro muscular_male penis perineum rear_view sea shark_tail slit solo standing tapering_penis underwater underwater_view water rulethony34tano_(director) ambient_sealife anthozoan cnidarian coral fish marine shark hi_res