UMD-688 - Couple Swap Hot Spring Trip 7

There have been stories before, but most of them were unsatisfying or nonsensical. While simple, this is the first time I've felt like the story was actually well-constructed. That said, I'm not entirely satisfied with the content, as there are a few lacking parts. Still, as long as it's erotic and the plot makes sense, it's a perfectly enjoyable production.