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You are married to a competitive bodybuilder that keeps nagging you to get into better shape. It seems no matter what you do it's never enough for him. So you find an experimental serum on the internet that is supposed to enhance muscle growth to take during your workouts. It's discontinued the day after you receive it, but you spent $500 on 5 gallons of it! You start taking it anyway, hoping you can get your money's worth. It helps with your muscle building, but the side effect, you find, is that it is making you grow taller. A LOT taller. You've grown over a foot taller in the first week! You didn't like it at first, but you start to find your new increasing height becomes enchanting. You get such a feeling of power, and so much attention...everyone looking up to you...so you keep taking the serum, and you keep growing bigger and taller by the day. Your adult Step-Son comes for a visit one day. He's very sweet and loving and you've always had a good relationship with him. He has a giantess fetish that you've always known about. He's depressed because his girlfriend just broke up with him, and is in absolute shock when he sees you towering several FEET taller than him.