Don't threaten Nikki with a good time, he will take you up on it. Is Sonic going to develop a reputation at this rate!?!? Though I guess if Amane's willing to see reason, there's no real point to booting him out of the Dream Sphere...

Keiwa also spotted Ai talking with the Yugi's that one morning + he's been around a few times that Ai swings by so... 8|;;; Like with Amane's 'secret' identity, he probably figured it out a while back and just... never bothered confirming it. It's not like it would change anything (in his opinion).