Kid thought something was off when he’d left after the heist. An itch has started in his shoulders and back and wouldn’t stop, no matter how much he rubbed. By the time he’d gotten to the other’s house, it was accompanied by a growing pressure. And it was driving him a bit crazy. As soon as he made his way inside, he went into the closest room he could get to and took off his jacket. And once he got the shirt off, the first thing he did was let out a sigh of relief as the pressure disappeared.
And then he saw what had been causing it.
Two large white wings stretched out, now that they were free from the restraint. The thief stared at them for a moment before slowly closing his mouth and reaching across his shoulder to touch one of them, ruffling the feathers some. Yep, he could feel it. The hand slowly pulled away and he tested moving them, tilting and flexing them slightly before completely folding them back.

Which is when he noticed he was no longer alone.
He hesitated a moment before grinning.
“Nice to see you again, tantei-kun.~ Sorry for not coming to say hi when I dropped in, but I got a bit preoccupied…”
Looking down, he saw the shirt and coat were still in a pile on the floor, so he reached down to get them, smoothing them out and setting them to the side. He’d definitely need to find out what to do about wearing those later…