A girl went to math detention because she is learning how to teach. She's a living calculator. She got 1st place at maths Olympiad. There was a boy at detention from higher class. Girl gave him more and more work because he was talking all the time. He tried to piss her off by acting that he don't understand. But she was calm not showing her agriness. Boy started to like her more and more. Soon they started dating and she become his girlfriend. But at her class was his younger brother what was one year older than her and three years younger than his brother. He liked her from the start. He looked at her, watched what she does. When she become his brothers girlfriend he knew, he needs to get her to himself. His brother will ruin her.
