Alex asked Mortimer if he could help her tutor Krystal in math. Krystal is the girl Cassandra helped cheat on her test. Morti didn't want to carry his books that he was tutoring his daufgter on to work, so he stopped by the school after class and they arranged to pick up the books at his house. When he went upstairs to the library to get them, Alex and Krystal were passing the time downstairs by masturbating each other's pussies. The tutoring turned into a real fuck and Morti gave them a lot of hot cum.