Mami Nagase, a beautiful married part-time coworker, secretly gets into the passenger seat with her hat pulled low. Since both have children, they talk about parenting and their marriages, and she admits that sex with her husband has become less frequent. At her gentle suggestion they enter a love hotel and have sex. Curious to swallow semen for the first time, Mami happily gulps down his load. They continue until just before her husband comes home at 10 p.m., with Mami repeatedly swallowing cum and taking creampies.