Derek already knows exactly what Thomas would look like in one of his leather jackets because he's effectively seen it already, but he doesn't mention that. He barely even makes the connection between Thomas and Stiles anymore, except when it's glaringly obvious. They may share the same face, the same body, but that's not what's important. They're entirely different people.

It took some time, but now when Derek looks at Thomas he just sees Thomas, his friend, and it doesn't even ache at all. Derek is glad for that. Thomas doesn't deserve for anyone to look at him and see a ghost.

"Is that right?" Derek asks with a pleased chuckle of his own, reaching out to lightly elbow Thomas' arm. "You on that list?"