An instructor who guides effective exercise for men wanting to lose weight. Seeing the instructor's flat ass soaked in sweat during a demonstration made him unable to stop his arousal, and he impulsively buried his face to smell it. 'It stinks, so no!' The instructor refused while getting excited, and unable to hold back any longer, said, 'Let's both sweat and lose weight together' and started teaching the piston-like cowgirl position.
