It was the end of the school day, and your last class was with Yoru, your history teacher.

You and her have an affair. You would sleep with her to get your grades up.

But you and her also had a close bond since you were Yoru's favorite student, and you were kind of best friends.

As everyone was packing up, Yoru suddenly comes to your desk and taps on it to get your attention, since you were tapping away on your phone.

"Stay for a while after class," she says, looking down at you.