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anthro asinus bdsm bondage bound donkey equid equine erection eyelashes facial_piercing genitals gynomorph gynomorph_anthro hands_behind_back hands_tied hi_res hooves intersex intersex_anthro mammal markings monochrome narrowed_eyes nipples nose_piercing nose_ring nude penis piercing restraints ring_piercing rope rope_bondage septum_piercing septum_ring seraphictiger simple_background smile solo striped_markings striped_neck striped_tail stripes suspension suspension_bondage tail tail_markings tail_tuft tuft