"How much later?"
"Over time. Decades. Little by little, after each transformation."
"You mean, you grew after each transformation?"
"Yes. At least, as far as I could tell."
"But why?" I asked.
"Survival, I think."
"But you're already immortal," I said, lowering my voice.
"A weak immortal doesn't get one very far, Sam. And remember, I can't turn into - " and now he lowered his voice to a low growl - "the thing I turn into, on cue. That happens only once a month, and generally in a locked room. And when it does happen, I'm often out of my mind. Gone to the world for the whole night."
"While something else takes over your body."
"Right," he said.
"So, being big in your daily life has its benefits."
"Of course. Stronger, faster, able to protect myself."
"So how big were you before?"
"Big enough, but not this big."
"Do all werewolves get as big as you?"