Yumi is dominated by Maria, who has taken over her father's company. Maria, a lesbian, sets her sights on Yumi and forces her to surrender her body as the price for protecting the company. Maria seeks Yumi during breaks from work, initially tormenting her voluptuous, soft body and indulging in pleasure. Gradually, however, Maria becomes dependent on Yumi and begins craving having her own ample breasts teased by her. As the power shifts, Yumi executes a long-held plan against Maria, leading to a surprising new turn of events.