Pawing for More (слэш)

Ciel finds out that there is more to Sebastian than meets the eye. Of course Sebastian can transform his physical body into that of a-a-achoo! ...into something that Ciel is allergic to. Fate has plans to ensure Ciel can admire this other form Sebastian has hid form him for so long. (This is my first fluffy-gone-pwp work, so don't be surprised at the lack of actual story please).