So here's what I'm thinking with regard to Louis and Kaworu. I have a couple of options on Kaworu's age, since at the canon point I'm taking him from, he hasn't physically aged past 15, but in truth he's 29. I'm thinking it might be fun to play him actually matching the latter for once, and only look younger in the awakened state. So in that case, I'm wondering if they might work together as music teachers. Maybe they teach different grade levels or different specialties. Kaworu is canonly skilled at playing piano, and his interactions were generally with teenagers, so that could possibly inform what and who he teaches, but it could also be other things.

But anyway. Teacher buddies? In that case I think having them go together for prompt two on the test drive would be fitting.