Gagged and bound, the slave's eyes widen as the mistress approaches, her hands hidden behind her back. She reveals her secret, a thick, veined strap-on cock, and the slave's breath hitches, her heart pounding in her chest. The mistress teases her, running the head along the slave's lips, her tongue darting out to lick tentatively. With a growl, the mistress grabs the slave's hair, forcing her head back, and plunges the strap-on deep into her throat, fucking her mercilessly, leaving her gasping and choking, her mascara running down her flushed cheeks.