[action]
[God, he'd never tease Ollie again for being so slow. Or Chloe, for that matter - how did they go through life at this snail's pace? It was torture. Every time he passed by something interesting, he was half-tempted to just zip by and---no, he couldn't. He's slow, and Wally's waiting for him.
Needless to say, Bart arrives at the Bistro a few minutes late, as he'd gotten distracted by a few things (and he'd snagged a pair of sunglasses). Hey, if he's going to meet a fellow speedster, it might as well be in style.
The kid still looks unfamiliar, even up close, and that bothers Bart. Wally has no good reason to lie about them being family, especially about that other Bart. The one that doesn't look like him. The one that's supposed to be his grandson. If he didn't know better, he'd say he was Wally's uncle, but that's not possible, unless they're more distantly related - Bart doesn't have any siblings, after all.
Still, he manages a smile as he slides in the seat across from his nephew.] Hey. Sorry I took so long. [Normal people time's hard to estimate!]