Derek was not prepared for that question, and it was obvious as his jaw dropped a little. He turned red, more from awkwardness than embarrassment, and cleared his throat.
"...yes and no," he answered, his voice tight. "A werewolf can shift, and when shifted, and aroused, he has a knot. But..." he exhaled and scrubbed his fingers through his hair. "It's not exactly the norm for most werewolves. And before you ask, yes, I have. And yes, I enjoyed it."