The whole story is differant from your usual style, in some ways.
About the sex: believe me, it was hot. It was far from being sucky. Can't wait for more. I mean, part of that is because we've been wanting this to happen since around chapter two, so you've had lots of build up. But really, don't worry about it being badly written.
Sorry you're feeling under the weather, I did that whole thing a couple weeks ago and it wasn't fun... I'll selfishly hope this lets you get more writing done. But still, feel better!
I'm curious, if you're already working on 10, are 8 and 9 finished? Do you have a plan for when to release them? Hmm...