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animal_genitalia anthro balls buyo_(artist)digitigrade erection flexing furgonomic_piercing furgonomics genital_piercing genitals hybrid lagomorph leporid long_ears male mammal murid murine muscular muscular_anthro muscular_male nipple_piercing nipples penis piercing rabbit rat rodent sheath sheath_piercing sheathed_tapering_penis solo tapering_penis