DxD: Tetsuya the Chimera

Tetsuya Kambayashi is a normal teenager who loves zoology and all things animals. One night he is suddenly abducted by a malicious devil who wants to play a game of cat and mouse with him. On the edge of death, Tetsuya discovers a secret power that he has nurtured since his birth - one that will change his life forever and bring him into the complicated world of Heaven and Hell.

Currently a one-shot, please post feedback in comments.