[ Friendship? In this economy?

It's more likely than you think. Considering how much he seems to frustrate her, he's flattered she'd suggest it. ]

I have not had many people call me that.

[ Big surprise, he's quite sure, given his... temperament. He inclines his head a little in acceptance. ]

It would be an honour. I will do my best to live up to the high standard I have no doubt you set as an example.

[ Hermione will clearly be much better at the friend thing, he has no delusions about it. ]