She is giving a story to a random commentor. Simply go to Picklessauce69's profile and read her story "Swimming isn't all you can do at the beach: A Birthday Present". Then, leave a comment and you're entered.
If you ever want something for yourself that's similar, I do commissions and right now I even have a special promotion that's lots of fun (and discounts!). Check it out ---> https://www.sofurry.com/view/593317