SONE-453 A busty girlfriend who is devoted to her boyfriend falls into an unexpected pleasure-filled NTR. Her beloved girlfriend, who she was even engaged to, seems to be being made to cum by her handsome gym trainer with her breasts...

The time for marriage is fast approaching. She is concerned about the weight on her body and starts going to a personal gym. After spending one-on-one time with her trainer, she starts to trust him, but he suddenly attacks her. She feels an overwhelming disgust for his abnormal cuckolding tendencies. Even though she hates it...! Her body quickly adapts and she falls into the pleasure. She becomes addicted to the trainer's powerful thrusts and wants more...