Kol knew that this wish was going to be a big shock to everyone, but he hadn't given much thought about how it might affect them, as well as himself. It was the had wanted for a long time. Something he had missed immensely the entire thousand and plus years he had been alive. He had been brilliant at magic, a real prodigy, and it was a piece of himself he'd lost when Esther had turned them all. A piece that now, he had back. And it felt amazing, it really did, even if he was a bit terrified because he hadn't been mortal in a millennia. In the end, when he'd thought about it, thought through the pros and the cons, he decided it was worth it. What he was gaining was better than what he would have to give up.
But in all his thinking and deciding, he hadn't really considered other people in his decision. Not that it would have changed anything, that he would have opted out just because people asked him not to, but he hadn't even considered it. And Crowley's reaction, more than anyone else's, had kind of hit him hard. He wasn't taking it well, the mortality, and everything that came with it. And he understood it, he did. But...he hated how bothered he was. So he decided to talk to him.
He wandered down the hall towards the study, where he knew Crowley likely was. He knocked lightly and hung in the doorway, "Hey."