Tutoring leads to student fucking older teacher to pass class

Two times a week one girl had classes with her chemistry teacher. The classes were boring, but she had to attend them otherwise she would never get her diploma. The last class was different from all the others. Tania was doing tasks and suddenly noticed that the teacher had an erection. She was embarrassed, but started slowly getting horny, so when the teacher's hand slid under her skirt she didn't oppose very hard and rode his big cock.