[For a second he wonders if he's gotten the wrong person, but when he replies, Akira gives a small smile and a nod in return for the wave.]

Duo in Bluo. Anyone ever tell you that has a ring to it? [Had he been waiting to make that joke the whole journey... anyway, he dismounts the bike, offering it to Duo.] I'll let you have it for an hour. Just don't go too fast, not everyone around here has seen one of these things, and the streets aren't built for it.

[Both of those things are common sense, but he doesn't want him to get carried away with how excited he looks.]