Shirou wasn't quite sure at first how to make up a plausible lie to Taiga and Sakura about having a "guest" staying over at the residence to avoid raising suspicious. But he was rather more shock when Saber made up a story that was quite convincing to fool the two women, who bought it without questions. It's impressive to say the least, which only made him far more curious about his servant true name. Once they were alone, he said, "So Saber, I don't think you had told me your real name."
It wasn’t difficult to accept-- the lies he had spoken. The two had been surmised and felt that he was being genuine with his words, even though he wasn’t. To spin such lies had been easy. Women were that easy to manipulate. Saber sat down, enjoying the rest of their dinner as the two had already called it a night and left. There wasn’t much to the era that garnered his interest, but perhaps in some form it would change.
“My name?” If it were any other Servant, they’d figure it’d be wise to not share their True Name to an irregular Master whose capabilities as a Magus had been sorely limited. However, he’s confident. He believes without a doubt that sharing this information will not affect the outcome and take away his victory. “Listen, boy, and listen well. I am King Conchobar mac Nessa. The Shield of Ulster. The greatest provincial King to date.”