Prostrate on the leather spanking bench, the submissive's ass cheeks clench in anticipation. Mistress Kathlin, in a tight leather corset and thigh-high boots, runs her gloved hands over his back, tracing the contours of his muscles. She picks up a heavy leather strap, snapping it against her palm, making him flinch. She chuckles, placing a reassuring hand on his lower back. She begins, the strap landing with a resounding thwack on his flesh. He gasps, his body tensing, then relaxing as the initial sting morphs into a warm, pulsating heat. She continues, her rhythm steady, her breath matching his, until his ass is a beautiful shade of red, his moans a symphony of pain and pleasure.