I kind of dig the look on her face, seeming to say so much:

"Oh, dude ... with all these condoms, I really thought you'd figured out that I want you to actually fuck me, and here you go off before I can even get my pants undone ... I mean, I guess, maybe, it's kinda sweet, in a way, like saying I'm just that hot, that you couldn't hold it in. Dunno what I expected from a high school guy — but at least I know you'll be ready again in a few minutes. <3"