«A Monogamous Threesome» by Charlie Hedo

John studied his wife who was carrying a bag on her shoulder. He chuckled when he saw what she took with her that couldn’t fit in the bag. A large bath towel, The Girl on the Train book, two magazines including one for interior design , a gossip magazine and finally a pair of high-heeled shoes that she had bought yesterday at the Cours Saleya.
She reached the first platform in one piece, but now she had to take another set of stairs, because the swimming pool was on the highest terrace.
As she walked up the other stairs she felt how the towel was sliding and she clenched it between her chin and shoulder, making sure that the shoes and the books didn’t fall either.
Her slippers and the stairs were the only things she could see at the moment and at first glance that was what seemed the most important, but she hadn’t taken into account the oncoming traffic. She almost ran her head on into the bulging part of a pair of boxer shorts.
"Ow" she cried, while it was she who rammed the man on the stairs in his crotch.
Her forehead had ended up in the balls of a man who was standing at the top of the stairs.
 On holiday in Nice Juliette rammed a man in his crotch. It turned out to be a handsome Italian, staying in an apartment opposite her and her husband.
The rest of the holiday the question is no longer whether she will remain faithful, but how.
From the author of Hotwife Monologues.