As far as Felix is concerned, she's a friend until proven otherwise. Even if she doesn't know it yet. Despite what one might assume, it's not naivety, just a knowing and calculated gamble.

Besides, half the trick to making unexpected friends is being willing to come out and declare them so.

"Of course. Some other time, if you prefer. I doubt there's any urgency." He gives her a reassuring smile: she can ask when she feels the need to know, and he won't push her.