[Considering the circumstances he should be more worried, but he's not. He's had this kind of argument turn into sex before, and while he's not expecting that to happen it makes him less cautious than he should be.]

Dunno, I've heard kissing works. Fancy giving it a try?

[Normally he wouldn't offer again but he really doesn't have anything to lose. He's not going to play their game, he's going to do what he wants and currently that's teasing Germany and even, very possibly, trying to get something from him.]