I enjoyed this story. It's a pleasant little romp with nothing to distract from the overall story. There's no character development as the story is so short, but there are several characters who get to tell parts of the tale from their point of view.
I think the sex was well done and the action descriptive. I would like to see the author consider returning to Violet and her summer again, possibly turning it into a series of vignettes about her life and her sexual adventures.
Overall, it's a perfectly brief stroke story that could spark more visits to interesting days in Violet's life or possibly the start of a series based on Kim's parents and their seduction of more of her friends.