For all my searching I can't find a story of a young couple/older guy on a boat

[Infrasound]

Hi folks,

I've been using the search function for ages to try and find a story of a young couple who go on a holiday/boat trip with an older guy as deck help - ending with wife sleeping with older guy after husband catches him masturbating over a photo of her.

If anyone's come across it, please let me know - it's a great story.