Of course he was gonna go for it, but! He likes giving Kai a heads up before just dropping information on him!!

"I wasn't going to tell anyone because it's really not a big deal, but, it's actually my birthday today."

He says it with a sheepish little smile, like he's really hoping this won't blow anything out of proportion - he just wants to let Kai know, that's all! "So all of this feels extra nice, you know?"