Couple of partners study and masturbate.

Each of them had a special way of knowing what the other was thinking. They didn't know what it was about or how they had achieved that level of mental penetration, but it always happened. They had been friends all their lives and she was the only one who really knew him in depth, while he was the only one who could reassure her when the world was coming at her. That day they were studying, that day everything was normal but the moment came when everything would change, they both knew it at the same time, they were no longer children and the best way to do it was together.