SKMJ-567 Brother and Sister Reunite at a Mixed Bathing Hot Spring After Ten Years

A brother and sister who have not bathed together in ten years find themselves at a mixed-gender hot spring, with the brother insisting that he feels nothing seeing his sister naked. She is embarrassed, and he tries to act indifferent, but the situation quickly becomes more complicated as old boundaries blur. Over the course of 237 minutes, they work through that tension in ways neither expected.