An Affair With My Brother-in-law

The horny billionaire married my sis, but he only wanted to take me to his bed... Bedroom, washroom, living room, office, elevator, there wasn't any place left where they didn't make out. However, every time she did that* with him, she felt guilty, disgusted as the person was her sister's husband. She tried hard to avoid him, but he didn't let her escape from him. It wasn't her who wanted to cheat her sister by making out with her husband.