Nana works at a prestigious company and has been so busy that she's postponed answering her boyfriend's marriage proposal. He plans to re-propose on her birthday, presenting her with a ring, but that same day, Nana crosses the line with her coworker Takeda while staying late at the office. Highly sensitive, Nana repeatedly reaches intense orgasms from the deep, stimulating cock, losing herself in pleasure and forgetting all about her boyfriend. Cheating sex with office blowjobs and endless orgasms in a hotel room... Meanwhile, her boyfriend grows increasingly anxious as she ignores his calls, ultimately forced into a heart-wrenching, gut-wrenching NTR (cuckold) experience.