"It has an hour since I posted the question and it hasn't been answered."
First of all, Calm. The. F***. Down.
Y!A is not instantaneous. Give it at least 24 hours, assuming this f*cking chinese spammer doesn't completely flood all the legitimate questions off the site with his cr*p...
Second, so let me get this straight, you're stalking someone on Xbox Live and want to send her an unsolicited message full of sexually explicit language detailing what you want to do to her.
Yeah, I'm pretty sure that violates all sorts of rules. At the very least Microsoft will ban the dummy account, permanently. Whether Microsoft takes further action - such as banning your XBox console, your other account(s) or even calling the local cops because you're harassing (threatening) one of their users is unknown but fully within the realm of possibility.