[It's a relief in one sense—it's playful, it's distracting, and it's a slight thrill to tempt fate and allude to things like that around someone he likes—and then on the other hand, he feels his stomach knot up with baseless anxiety at the question. There's the certainty, deep down, that whatever comes out of his mouth will ruin (something?) in (some way??) that he can't logically follow, and yet not being able to place what or why doesn't make the feeling go away.

He laughs anyway, though he can't quite hold back all of his nerves showing through.]

—You're just asking how many of my friends ever stayed the night here for whatever reason! Right? You're totally teasing me! It's just one!