It's adorable that Kai is shy -- and not violently shy, but just in his own, quiet way. I think I can see why people like Viharn and Ratri like him, for wearing his heart on his sleeve and all.

Also: Kai also seems to be a bit embarassed about his sexual relationship with another man.

I'm pretty sure he's just embarassed about the sex? Also, Nozomi and Kai talking about "it" would be hilarious, even if it would never happen.