Personal trainer Mizuki uploads training videos, earns views from followers who are interested in seeing her sexy ass, and works hard every day to recruit students who want to train in person. But Mizuki has a bad habit. When she sees a student's erect penis with a big ass through his clothes and realizes that it's the shape, hardness, and size she likes, she forgets about training and works hard to develop it! Even after ejaculating, her sexy, undulating big ass won't let go! Mizuki's Spartan big ass training is sure to make you go crazy!