Derek quickly shifted back to human, and frowned. So...the boy was either playing dumb, or he didn't know what he'd done. They'd have a talk--as soon as the werewolf got himself off and restored the balance.
He levered himself off of the boy, straddling the boy's hips as he tugged at his erection. He jacked himself quickly, with harsh, tight strokes.
"Open up," he ordered. "You still want this, don't you?"