[Miyavifan]

That's what I think.
He told me he will not be sleeping with her, cause he has no wish to spend 20 years in jail. But even just having her at the house is bad, right?

and now I am thinking that she might be drinking over there.

He said she'll be over tomorrow, and there will be some other people there, his roommates and their girlfriends among them. And they will be watching movies, and drinking.

He didn't say she'd be drinking, but it can be implied, right?