As you dress as Santa your friend Tim sees you and having long ago lost his belief in Santa sees you as a fat old man in a Santa suit.
Ho Ho Ho you say to Tim in what has become quite a husky voice.
Playing along Tim says how are you doing Santa.
It's me Sam.
Look old man I will play along with you as Santa but you're not Sam.
Yes I am. I put on these socks and started to become like dad and now I have grown bigger than him and round.
Look we've had fun now I am going home.
Ask me anything I will prove it to you.
Tim took a moment and thought about it looking the old man over. Ok. What did we do three years ago in that tree house down near the lake?
We made out for the first time. It's when we both found out we were gay.
You could have guessed that.
Ask me something else. I know your middle name is Marion.
This took Tim by surprise because he told no one that.
He looked deep into your eyes. Sam?
Yea it's me.
What the hell happened to you?
I put on these socks and they seem to change me when I put them on to this form.
Cool.
Tim was a chubby chaser. He liked that Sam had been a bit chunky from the start but he was always turned on by Santa from early in his life and this time he could live out a fantasy he had with sleeping with him.
As they headed down to the tree house, they didn't want the rest of their families see them together they climbed up, Sam having a tough time climbing up and squeezing through the hole to get in and the slats creaked with the weight but Tim dropped Sam's Santa pants to his ankles exposing a cock that way playing peek a boo in his crotch. He opened the coat exposing a furry chest with man boobs and resting on his back Tim was completely naked and climbed on top of Sam and started getting him hard.
Sam's cock grew to quite massive proportions poking out of the fat pad and thickening up.
Once hard Tim climbed on top and started working Sam's cock till he came deep inside of him.
Tim enjoyed this so much he did it again and again till they both became exhausted. Tim rested on top of Sam pulling the coat around him and holding him like a child to his breast the two fell asleep only to wake in the morning.
When they woke Tim noticed a change in himself. He was quite a bit smaller than he was the day before. His ears were pointed and the clothes piled in the corner were a Christmas green and red.
He started to wake Sam and his voice was a slight squeaky voice and he pushed and prodded the snoring fat man until he woke.
What the hell did you do to me?
I didn't do anything but you look like a good Santa's elf.
I don't want to be an elf.
Let me take the socks off I will change back and I would guess you will too.
But having worn them all night past sunrise made the changes permanent and Sam was now the real Santa and Tim was the first of many elves.