So the stories is fairly newish maybe few months old....it was about a guy who was in a spa with a few other people and there was a young girl in aswell. Eventually everyone left except the girl and the guy. She ends up going down on him and puts a band on him. At the end of it she cuts off his genitals completly and puts them into her bikini bottoms and then leaves.

Please forgive the grammer...English isn't my strength haha

I think the story you are looking for is called Hot Tub Hottie [S] by takem222.

That's the one! I had never even thought to search for "hot tub" everyone just calls them a spa here...

Thank you heaps!