[...OH NO! Is it better in private, or somewhere a little more public, like at the park? She looks momentarily alarmed before her gaze drops and her cheeks burn.]

Er...w-well, it's about the letter you left in my apartment, so maybe it would be better if you picked the best place to talk.

[She's still not sure if he left that letter on purpose or if he accidentally dropped it. No going back now.]