The family she married into was a chiropractic clinic, and her father-in-law asked her to help out. Her husband neglected their marriage, and Yuri was lonely inside, so she masturbated to relieve her stress... When her father-in-law witnessed this, he was unable to stop his suppressed lust, so he gave her an aphrodisiac and played with her body with an oil massage, but her body reacted and she fell into carnal desire.