I liked this, it was different. A perfect mix of the wizarding and muggle worlds. I like that you used Dean instead of Ron. Ron would have wanted to go with Harry and that wouldn't have worked for this story.
I like that there wasn't a lot of mush leading to the sex. It happened as a result of raw passion. The finger sucking was as hot as the sex itelf!
I like the vagueness about Snape's innocence. And I found it interesting that Snape led Rowle to Voldemort but detested what Rowle had become. Theirs was an odd relationship. It was perfectly IC that Snape already have his memories ready for Harry and his reasons for not going to the ministry with what he knew.
Great job with this fic! You should continue this foray into mystery, you're good at it!