[Well he could have gone with "sexy" instead, but he's not sure if Kaoru would have appreciated that -]

Oh, no no, you don't need to call me sir - I'm not that old, you know!

As for repaying me... I can think of a few ways, mmhmhm! [don't do it] But you don't have to worry about that just yet, since I'd need to cultivate my ingredients first...
And that might take a while.