It's not so much back-peddling out as just trying to feel the situation out and still trying to get a handle on what this really means to John. Though he supposes he could keep asking all night at this rate.

Momentarily bewildered by the other man's reply -- use your imagination? oh, about the double made of twins -- Ianto shakes his head in reply to the question, before forcing himself to answer it anyway.

"I can, you know. Stay on just the one." It's easier when there's a great crack of mattresses in the middle, after all.