As Madara watched Obito train relentlessly in order to re-condition his body, he reflected that it was a good thing he hadn't had to pee for a good long time.

That did seem to be an odd and completely random thing to think, especially then, but having actual company reminded him of what it had been like out in the world before his survival had depended on him remaining connected to this thrice-damned root that limited his mobility to only a few square feet of space. The thing was, he never did grow out of that little shy bladder problem, and having Tobirama jump out at him when he'd been about to go and start laughing when he'd failed to do so after he and Hashirama had turned that forest by the Naka River which they'd used to skip stones across into a village like Hashirama had said they would back when they were kids hadn't improved matters any.

He couldn't count the number of times his bladder had nearly exploded because Tobirama had caught him when he'd been about to take a leak and decided to follow him around for a day or two so he couldn't do so. Thanks to Tobirama's little habit, he'd contracted two particularly nasty bladder infections, one of which had laid him up for more than a week.

Hashirama he'd liked and even now he was willing to admit to himself that was so, but Tobirama had been and would always be a fucking jerk. In fact, it had been Tobirama that he'd been so stridently warning his clan against.

Not that they'd listened to him...