Maybe I'm missing something, but whatever else you might say about the Harry Potter books, you wouldn't call them erotic. (as of book 5, anyway)
Hermione and some of the girls might get there soon, but who else? And I'm guessing it's not any better for the other team - Dudley? Hagrid? Dumbledore? Crabb and Goyle? Perhaps least of all, Snape?
The site says it's for 18 and older, and I'm taking their word for it - I just looked at the front page to convince myself it was really there. With no more fuss, I present Sexy Severus Snape