Personally, I'm down with the Aaron punishing Sarah arc in the story. I'd also prefer to see David get with Alice. He's already built it up so much, it might as well happen.
An interesting twist with Alice, say Aaron goes for his late night touchy-feely constitutional while she happens to be dreaming of her and David together, she wakes up midway through and thinks it's David in her room, so she lifts her ass and presents herself to him, Aaron takes initiative and taxes her toned ass only for her to realize that it's Aaron and not David as they climax together.
Don't really care for Peter's role in this story, but if he wants to use him again, you could have Uncle Peter watching from the shadows, maybe using this information to somehow swing an all-night unprotected A2M extravaganza with Sarah.