With her husband away on business, Reiko drifts through dull days of housework, childcare, and a part-time job. She grows close to Azuma, an adult student coworker whose shifts overlap with hers, and accepts a strictly time-limited affair while her husband is gone. They begin squeezing intense sex into every available break and location. The concentrated pleasure makes Reiko writhe wildly, and before long she aches around the clock, staying wet as she craves the younger man's cock while he races to cum before their stolen time runs out.