[He just embarrassed himself! It's taking a lot of effort not to hide. Well, she doesn't seem mad at him or anything, so he can relax a little. Not terribly much though, his words are a bit more formal than usual.]

No, not at all! You can stay as long as you like. ...Please accept my apology for my rudeness before. I didn't know there was anyone else here.

[He gives her a friendly smile.]

You're not allergic to anything, right?