Lex, of course, could immediately tell that Tetsuya was feeling awkward about something. It was not difficult to guess that the man did not remember Lex's name. Lex doubted if he even knew it to begin with.
So naturally, he did the reasonable thing, and decided to manipulate all events surrounding Tetsuya so that he would never be able to hear someone else call Lex by his name, and see how long he could keep this game going.
Considering that he himself was immortal now, and Tetsuya seemed competent enough to reach that level one day, it would be pretty funny if thousands of years later they continued to meet each other, but Tetsuya still did not know his name.
"By the way, while you may look different, I suggest you do not go by the name Paul while at the tavern. There's no need to push your luck," Lex said, teasing the man by bringing up names once more.