Rei works as a newly hired caregiver. She gains the trust of Kiyoshi, the elderly man she cares for, with her honest work ethic. However, one day, Rei unexpectedly falls asleep while providing care. When questioned by Kiyoshi, she reveals that she is working day and night to repay her fiancé's debt. Instead of being concerned for Rei, Kiyoshi begins a sticky sexual harassment! He feeds her mouth-to-mouth, entangles her with his dirty tongue, and makes her persistently care for his dick during cleansing. Calmly handing Rei compensation money, Rei, worried about her future with her fiancé, ultimately concludes an "implicit physical contract" and crosses the line with the elderly man…