The teen brother's bedroom eyes gleam with mischief as he corners his blushing, virgin step-sister. "You're so innocent," he teases, running a finger down her cheek, "but I bet you're curious." She swallows hard, her heart pounding as he leans in, his breath hot on her neck. "Let me teach you, little sister," he whispers, his hand moving to her thigh. She stiffens, but he's persistent, his touch electric. "Just a little," he promises, guiding her hand to his throbbing cock. She hesitates, then wraps her fingers around it, feeling its length. His grin widens, "Good girl."