Lucky for Gen, Tidus isn't the kind of impatient personality to want to hurry along a story. --Alright, that's not quite true; but he's just as invested to hear Gen retell the events, a small nod at what Senku's like, nothing more needed to be said there. Though that fact does rear its head again, with both of Tidus's brows raising at Gen's pause.

"You didn't tease him into it? I'm surprised the idea came up for the guy!"

Was there some particular reason for it? Something to do with Senku, or just all this time on the train, the opportunity. Tidus doubts it's a thought he'll know the answer for, but then, what did it matter? As long as the two were happy with it.