He was glad that Mao decided to go along with is sudden change of topic.
There was something that Mao knew that he needed to investigate further.
Why did he want to know what time he came from?
He got the feeling that this demon was different from the one he knew. Perhaps he was from the future.

"Very well. I shall follow you." Geoffrey answered. For some reason he could sense that the demon boy didn't trust him as much as he used to. It was surely odd and although that was in his plans, it was still too early for Mao to doubt him...