[Alvin does notice her getting a but flustered, but he does indeed mistake it for nerves. They've invaded each other's personal spaces so many times he really thinks nothing of it.

So he just gives her a reassuring grin.]

I was kidding before, but don't worry—I won't let you go. But if it's too much just drop the key.

...Assuming it'll let you.

[HE STARTED SO WELL BUT HE JUST COULDN'T HELP THE LAST PART.]