Rinako Fujiwara, working part-time as a female-targeted adult product tester, enjoyed masturbating with a vibrator every day, often screaming intensely as she reached multiple orgasms. Her loud moans reached the ears of the neighborhood association chairman next door. One day, drawn by the sounds, he sneaked into her room and realized her deep craving for a real cock. In that moment, Rinako begged him to take her, willingly choosing to become his sex slave. This impulsive decision would drastically change both of their fates...