I work part-time at a convenience store. One day, when I tried to go home after work, I couldn't go home due to heavy rain ... Then, Yuri-chan, a bright and short sister-like junior who was wearing a shift, decided to stay at the house. After returning home soaked, Yuri-chan changes clothes behind me ... Big breasts that can not be imagined from the clothes that were glimpsed at that time ... Moreover, Yuri-chan seduced me by sticking her boobs in her arms.