In all honesty, Sulu could understand the complications alien cookware could provide. He'd seen his share of strange devices that were supposed to do all sorts of things, but all he and his family ever made anything like that do was steam and possibly burn whatever they'd put in it. The fact that it was an "almost" in that situation was probably a good thing.

Moving through the flat, Sulu brought them into the kitchen and found Ianto a seat at the table, helping him sit down before cracking his knuckles as he turned to the now whistling kettle, taking it off the burner. He paused, then turned to face Ianto with a serious expression on his face. "All you have to do is tell me and I'll step in," he reiterated from before, "I'm serious. If he starts shouting and losing his temper, I'm not going to let him do anything stupid." Like throw a chair, or break something, or worst of all, run.