Dr Jekell and Mr Hyde

[Guest Slyffindor]

Basically, Hermione becomes Snape's assistant. Snape is trying to cure wizard impotency, and uses himself as a test subject. Then, he starts to change into this sex crazy monster.

Does this sound familiar to anyone?

[Kyarorin]

I think I've read a couple that sound like that. The one I can remember right now is Ms. Figg's Hard Times for Severus Snape on this site.