Kangoku ~Kairaku Kousei Project~

The protagonist, Teruaki Kashida, is a rookie prison guard who wants to become a professional at rehabilitating female prisoners with erotic punishments. And before
he goes to see the next four women he's going to rehabilitate ... "Ah! No, stop! It's going in, it's going in! Mmm, ah... uhh" He had hung one of them, Koyori, from the ceiling and was enjoying giving her a thighjob with her plump thighs. Even a hopeless pervert like him had some justification for his job, thinking that he could punish girls as much as he wanted. But that was short-lived. In reality, he spends his days rehabilitating female prisoners who are like gorillas that have become uncontrollable in a zoo. He was about to give up on continuing this job. However, the god of eroticism had not yet abandoned him. "Next targets... They're all beauties, and they're all busty!!" This is the daily life of Teruaki Kashida, a perverted prison guard , who rapes the busty female prisoners under the guise of rehabilitation.