Personal trainer Mizuki has been uploading training videos with her erotic ass in mind, racking up views from fans eager to see more. She spends her days inviting students for personal sessions after they get hard just looking at her huge butt through their clothes. However, there's one thing about Mizuki that's not so good... When she realizes that the student's erection matches her preferred size, shape, and firmness, she becomes obsessed with cock-training instead of actual workouts! Even when he cums, the undulating giant ass never escapes her sight! Prepare to be driven wild by Mizuki's brutal spartan anal training regime! *Note: Content may vary depending on recording method.