In the dim morning light, Sarah and Mark lay entwined in their shared bed, the cotton sheets twisted around their legs. Sarah's hand, warm and soft, gently wrapped around Mark's hardening cock, her fingers teasing him with slow, deliberate strokes. "Mark," she whispered, a mischievous glint in her eyes, "I must tell you something. When Sandra wore that short skirt to school yesterday, I took a leather strap to her bottom....