I did it with her 3 times in the locker at night. And I'm stuck at 10 blue points. I have 40 affection but can't get laid. Or do other scenes after that.
Can't confess and she doesn't appear before class.
You need to go to the classroom and sit on the lesson. After the lesson in 11 am you should go out from the class and enter to the class again. And the point 11 will start...