Michael walked into the locker room. He was a 16 year old forward for the basketball team. Already, he was 6'5", and he knew he would hit 6'8" later in life.
As he pulled down his pants to change, the spell began it's work. First, his cock expanded to a lengthy 18 inches long, and it made a huge bulge in his pants.
Then, Dustin's twist took hold. Michael's upper body started to show signs of de-aging. Muscles collapsed in on themselves and his face took on a round shape that children usually have.
However, below his waistline, the opposite happened. His legs grew longer and thicker, and they framed his new cock perfectly. They grew a new layer of hair, and looked just like an 18 year old's legs. An abnormally tall 18 year old, maybe.
It looked absurd. Michael's upper body looked just like a kid, but it was attached to the longest legs of a kid ever! Michael still didn't notice, until he looked in the mirror...