The boyfriend steals things, the girl lets others have sex with her to protect her lover

Arina is a college student, because this convenience store is quite close to her home, she applied to work here part-time. Here she met Kotani and they fell in love. She thought her student life would be very fulfilling, but Oki-san, a very incompetent person who was fired from his old company, came to work here and discovered that Kotani was stealing from the store. He let Arina know and threatened to call the police to arrest Kotani. But he would keep it a secret if she agreed to do as he said.

And then, to protect her lover, Arina accepted his offer and let him have sex with her. But with his skills and his "big cock," Oki gradually conquered Arina. She gradually became infatuated with Oki's penis and neglected her boyfriend. Even when her boyfriend was discovered and fired, she didn't care, what she cared about now was being fucked by Oki every day...