Natsu ga Owaru made The Animation

Episode 1
Yui and Kou have been childhood friends for longer than anyone can remember. As they became adults they also became lovers. They couldn't keep their hands off of each other, having sex in just about any place imaginable... including at school.
Unfortunately for them a quite ugly bastard was in charge of the school cameras and decided it was time for some blackmail.

Episode 2
In order to protect her childhood friend and lover, she once again agrees to be his plaything. Taking everything from her, including her anal virginity.