Sulu grinned as Ianto sunk down into the water, unable to resist finding the whole thing sort of adorable. Plus, mood or no mood, it didn't exactly hurt to have a more unhindered view of Ianto lying against him in the tub. He did, however, recognize the slight risk of Ianto going under, should he happen to fall asleep, and so he took a moment to shift a little lower himself, one arm slipping under one of Ianto's and hooking lightly around his stomach. If he happened to start drifting off, at the very least Sulu would be able to hold him up a bit better.

Once he was sure he was comfortable enough - as comfortable as he could be, given the situation - Sulu let his other arm out of the water, draping it along the edge of the tub. "I really hope it makes you feel better," he said, "Because I'm definitely not against us doing this again. It's surprisingly comfortable."