Satoru instantly falls in love with Yuka, his mother's best friend, who is beautiful and sexy when she comes to stay the night. She shows off her attractive big breasts and can't help but drink her saliva. As his heartbeat continues to pound, Satoru becomes unable to stay still even if he is standing, and he impulsively peeks into Yuka's bathing form... He is immediately noticed by Yuka. However, instead of getting angry at her, Yuka invites Satoru straight into the bathroom and starts touching her body...