You've been secretly disappointed in your wife's body for a while now - she's tiny and weak, with a flat chest to match. While thinking about how you might be able to convince her to improve her physique you come across an ad from a boxing coach which catches your eye - she promises to whip people into shape, and from the photos on her website you get the feeling you wouldn't mind watching as she does. When you and your wife arrive to her first training session the coach is mean and humiliates your wife, flexing her muscles and pointing out how weak and disappointing your wife is. She's flirting with you quite obviously and you find yourself incredibly drawn to her...