Koji's water pipes burst at home, forcing him to stay overnight for several days. During this time, he is allowed to crash at his friend Ichiro's house. Koji, who secretly has a butt fetish, feels a hidden joy at getting to spend time with Ichiro's wife, Yu, and her voluptuous ass... Then, by chance, he witnesses Yu sticking out her rear while wearing sexy lingerie. Seeing Koji completely erect from excitement, Yu smiles and coaxes him, asking if he could apply some beauty oil for her...
