[Hayake] Manami-chan's Back-Hip-Circle Training (Imouto no Hadaka o Mite Koufun Suru nante Hen na Onii-chan) {Mistvern}

Manami-chan struggles through her intense gymnastics training, but her dedicated brother has a much more physical method in mind for her 'back-hip-circle' routine. As she exerts herself in her tight bloomers, the training shifts from athletic drills to a much more intimate session of hands-on stimulation. What begins as a workout for her hips quickly turns into a sensory-filled experience that targets her most sensitive spots, turning her exhaustion into a much different kind of tension. Will she successfully finish her training, or will the sensory overload be too much to handle?