He wastes no time in getting himself upstairs. He's only been dreaming of this kind of scenario for about three years now; he'd be lying if he tried to claim he weren't a bit nervous, but it's the good kind of nerves. He's definitely not going to let them stop him enjoying this.
Fifteen minutes, she said. That gives him time to have a quick wash and brush his teeth, and chuck a few glasses of Scotch down his throat. It crosses his mind that he might have time to give himself some relief before she gets here too, in the interests of making it last; he's in two minds though, and she'll be here any second. So he leaves it, and forces himself to go and sit on the sofa instead, and just wait.
He's never been the best at sitting still. She might think anticipation's the best part, but this is torture.