W-Well. You look quite 'tough' already, so to be even moreso than that...

[Here's the thing: she doesn't actually know if this is even the right direction to take this conversation, but "tough" is clearly something that this young man is proud of being, and it's not exactly hard to put two and two together in such a way that comes out flattering him on the other end.]

I'm very lucky to have come across you, then. I'm afraid I'm not so very tough at all.

[She is a BEAUTIFUL and DELICATE FLOWER]