"Of course I'm not a demon," Peter replied, finding the idea a bit hilarious. "I was bitten by this spider a while back and since then I can do that and a few other things." He wasn't bragging. No, never bragging. Especially not to an angel.
Hearing Castiel laugh brightened Peter's face and his smile grew. He was glad the other man was tickled by the webbing. Peter still found it amusing too and it had been a long time ago.
"You can't see everything in one lifetime. The world always has a way to surprise you, even with little things." He had a feeling that Cas was probably ancient. Far older than he was. So surprising him was probably a difficult task.