Peter thinks about it a moment. If the don't got to a fancy place where he has to make a whole scene about his proposal that's not a proposal but it kinda is because then what's even the point of a promise ring? Anyway. Back on topic-if he doesn't have to make a kind of scene then maybe he'll be much less nervous later? That sounds idea to him. The less people he can make a fool of himself in front of the better.

"Yeah, absolutely. I mean, it's your birthday." he shrugs, trying not to be nervous but then again, she can probably hear the irregular pattern of is heart beating and she's gonna guess what he's up too, isn't she? All because he can't even pretend he's not nervous.