She is usually a modest married woman who cares for her husband. She should have been a good wife who always put her husband before herself, but... she was on a trip and had a little alcohol in her, and she became free from the pressure of the image she had from those around her. The more demure a person is usually, the more amazing they are when they let loose. You're sure to get aroused by the wildness. It's too erotic, so be careful not to masturbate too much!