JAC-216 [NTR New Chapter] Worried about his girlfriend's infidelity, he installs a handsome man to monitor her behavior…! What is the true nature of his beautiful younger girlfriend…?

[New NTR Chapter] Worried about cheating, a handsome man is sent to monitor his girlfriend…! What is the true nature of the beautiful younger girlfriend he is so proud of…? His girlfriend is about a generation younger than him, beautiful, and has a ni