Sophie Sin 
Cheating On A Cheating Wife (Cheating Wives Series) [EPUB ebook] 

She drove him insane — took him to the edge — and there is nowhere else to go but down. Two gorgeous women, a watching cheating wife and a husband that could not take a second more without having his own revenge. This story ends with a twist that you’ll never expect. A book you won’t be able to put down to the end.