Well, she did tell you you've got a nice arse. People don't just throw that compliment around loosely.

[People who aren't Sirius Black don't, anyways. Details. He goes for the kettle as it begins to whistle.]

Anyway, it's always worth a shot. That's like saying, oh, I'm skipping tea, because I might burn my mouth. You might, but you might not. And it might actually end up being worth it.