Wings, he thought wings are the most exotic things of all the animal parts in there. As no human has it, so why not give it to himself? And also FLYING. That will be the most interesting thing with wings.
Description of them were simple. "Put the part you want on somewhere of your body. It will be join automatically. If you want to detach, look the next page."
He opened the box to find much of them. There were much more than his exception. Of course including wing of birds, it also had wings of insects, even some of mythical creatures ones like dragon, phoenix and fairy.
He looked for the wing which catch his mind. After passing some not so attractive wings, he finally found the nice one.
"O-kay, I'll choose the-"