Muscle trainer NTR: A submissive girlfriend is transformed into the physique of a muscular man, the kind of woman a muscular man desires, and then forced into a violent orgasm by his penis – a story of a submissive woman. Yuki Takeuchi HMN-799

Wanting to lose weight before her wedding, she started going to the gym. There, the trainer showed her his muscular physique, and she had sex with him because of the masculinity he possessed—something her boyfriend lacked. To see the trainer, she went to the gym every day, and each time her abs became more defined…! Attracted by a man with charm she lacked, she succumbed to a debilitating NTR-like arousal amidst his brute strength!