For a second there, Sulu had assumed that something very awful and possibly life-threatening was going to happen, from Ianto's reaction. Then, it sort of all fell into place when he realized who this new guy must've been. He gave Ianto a look, feeling a bit bad for him since he looked absolutely mortified - but, it was kind of impossible to resist making his life more miserable. Chalk it up to life with Jim Kirk.

"I thought you said I was the only one?" he asked with a vaguely scandalized expression, casually closing the file on the Daleks. "I never should have trusted a European."