I should say Are you sure, I think, although she seems pretty sure. So maybe it should be Am I sure, or some other pause to make sure this is proceeding at a pace I'm okay with.

What comes out of my mouth instead is, "God, can I?" with my hands already tugging her tank top up before I've even finished the sentence, which is maybe impolite. It's a little hard to think clearly with her under my hands, though, with her hips shifting against me. There's... friction. There's a whole- I'm very warm, and my brain hasn't stopped me yet, and that's great.