Kan was done in the bathroom with Nora and they had even had a bit of dinner together. Now Kan could have decided to stay the night but there was a certain look Nora gave him that made him certain that if he knew his biology and it worked the same here, they might be having a baby that night. So he decided to take count his loses and leave.
"Hey, why are you in such a hurry? I mean, your door's locked and it's not like you are in a strangers house where you have to be uncomfortable, right. I could make you comfortable," Nora proposed with a seductive wink. That was it right there, the thing Kan was trying to avoid now.