I want to have my wife and her friends gain the ability to drain my size to make themselves bigger, stronger, and hotter. And I want it to be an inch or two, occasionally, at first. Starting at 6'4" I can afford the losses for a while.
But then one drunken night they get competitive, all go too far. And when the blackout ends, I'm 2'0" and they're all damn near 7 feet tall. And it's permanent.