hey, everyone check this out. Read Fai's profile from the spoiler page in Wikipedia.
When he did awake the first thing he did was smile at Kurogane and said, "Good morning, Kurogane."Kurogane reacts be throwing a blanket over him and telling him to go back to sleep. This is the first time that Fay has actually called Kurogane by his full name. It has been a long running gag of the series that Fay would always come up with silly nicknames for Kurogane. The reason Fai decided to stop was because he realized he had gone to far, simply he made Kurogane fall in love with him. Fai realizes this, in both the talk he had with Kurogane in chapter 112, where basically Kurogane tells Fai "I am not concerend about your past, so quit playing around and think about the present", (basically Fai wants Kurogane to stop worrying about Ashura and start thinking about Kurogane), also Fai is pissed at Kurogane because he let Fai live when he wanted to die, this is probably when Fai realized he had gone to far. It has become very apperent that Fai does not want anyone to get hurt because of him. This is most likely why Fai does not want Kurogane to love him and is not letting himself fall in love with Kurogane. Fai is woried that when Ashura does wake up, Kurogane may confront Ashura inorder to protect Fai but may get hurt or killed in the process.