[ good thing Lupin was basically expecting a reaction along these lines, and is thus not offended by their less-than-enthused response. Actually, the fact that they're not outright expressing that they think it's stupid means this is a polite response, in Cairngormese, and he feels lightly flattered by the fact they're trying to be nice about it. That's some special treatment. ]

Mm. Life doesn't just spring up overnight. The same goes for you gems, too, doesn't it?

[ unfazed, he continues in a mild tone. ]

We make it through this winter, and we'll have made it through a year of living here - I think we deserve to celebrate by helping create something beautiful. You and me, together. I want something I can share with you. [ something they can do together - that sounds nice. Lupin pauses, then smirks. ] Besides, learning a little about life couldn't hurt you.