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all_fours american_opossum anthro anus arm_support ass_up barbell_piercing blush boypretties butt claws duo felid female forward_arm_support hi_res inviting_to_sex kneeling lion male male/female mammal mane marsupial monochrome muscular muscular_anthro muscular_male nipple_barbell nipple_piercing nipples pantherine pawpads perineum piercing presenting presenting_hindquarters presenting_partner raised_tail rear_view spread_butt spreading tail toe_claws