He's holding onto Otabek and Otabek is smiling. It's a really subtle thing, but the curl of his lips is there. It's more around his eyes than in his mouth, though, when he smiles, harder to see when he's wearing sunglasses, but obvious like this.

He's not quite a "kiss in the middle of the street" type, but he does sink against the wall next to him without disturbing the grip,

"I thought that was never going to end," and then, head tilted a little, "You can ride on the front of the bike this time," it's not permission, he's telling, "I don't trust you not to get us into an accident just because you can."