[ Given the company he usually keeps, teasing is about as good a token of friendship as any, and his heart positively soars at being addressed by her like this. It doesn't matter if they live under the same roof (unless she has her own cool bachelorette pad, I'm not the boss of you, Jes!!!) and eat at the same table and clean dishes together. He'll never not get a kick out of actually being her friend.

...Not that he would presume to be her friend!! Anyway...

He clears his throat, straightening up so his posture reflects more this "sir" fellow she speaks of. ]

Ahem - 'course not, Lady Lunafreya! Cough. [ He actually says the word. ] I think any powers you use only have to be as real as this disease Iiii apparently have!