Mary Potter and The Philosopher's Stone (Harry Potter's Transgender Twin Sister)

The Twins Who Lived

It was both a sad and happy day when the evil Wizard Voldemort disappeared.
It was of course happy because the world no longer had to live in fear.
But it was a sad day because two children were left orphaned. Harry and Mark Potter. The twins who lived were both only one year old at the time and had no parents or grandparents left in the world, however they did have a horrible maternal Aunt and Uncle and cousin.
The Dursleys.
Albus Dumbledore had no choice but to leave the twins with them.
One day however the world as they knew it would be turned upside down.
🏳️‍⚧️👧🏻⚡👦🏻🏳️‍⚧️
Now, before I continue this story I must explain something, are you right handed or left? And if someone made you do everything with the other hand it'd be super hard and weird correct? Well that's how Mary Potter felt, the same way you know which is your dominant hand, she knew she was a girl. Whilst the Dursleys hated the Potters they let Mary be whoever she chose so that's how Harry Potter has an identical twin sister.
🏳️‍⚧️👧🏻⚡👦🏻🏳️‍⚧️
Harry and Mary Potter slept in a cupboard under the stairs.
"Up, up, up, up" called Aunt Petunia to the twins.
Dudley ran down the stairs and stopped about halfway, then jumped up and down shouting, "wake up Cousins, we're going to the zoo".
Harry and Mary rolled out of bed, groaning.
Mary and Harry, being twins, looked almost exactly the same, except for their hair, Mary had long, messy dark brown hair, whist Harry's was shorter. And Mary was about 3 centimetres taller. Both had green eyes, but the only thing that they took pride in their appearance was a lightning bolt scar above their right eyes.
Mary pulled on an over sized grey t-shirt and some jeans, Harry did the same, they never had clothes of their own, only second hand ones from Dudley, who was rather large around the middle.
Then both reached for round rimmed glasses, Harry's with tape around the bridge.
The twins walked out to the kitchen.
"Oh, here he comes, the birthday boy!" Aunt Petunia cried
"Happy birthday, son" Uncle Vernon smiled.
Aunt Petunia and Dudley giggled together.
"Harry why don't you just cook the breakfast, and try not to burn anything".
"Yes, Aunt Petunia" Harry mumbled.
Harry then got to work on cooking the bacon.
"I want everything to be perfect for my Dudley's special day" Aunt Petunia sighed. 
"Hurry up! Bring my coffee, girl" Uncle Vernon shouted at Mary, who was sitting on the bench.
"Yes Uncle Vernon" she mumbled.
"Aren't they wonderful, darling?" Asked Aunt Petunia,who had led Dudley to his presents.
"How many are there?" Dudley asked loudly.
"Thirty-six. Counted 'em myself" said Uncle Vernon proudly
"Thirty-six?! But last year, last year I had thirty-seven" Dudley screamed and proceeded to throw a tantrum, whilst Harry and Mary rolled their eyes, when had they ever gotten a usable present.
🏳️‍⚧️👧🏻⚡👦🏻🏳️‍⚧️
Harry tried to get in the car but Vernon stopped him.
"Any funny business you two, any at all, and you won't have any meals for a week. Get in." Uncle warned.
"As if we would try to get into trouble" Mary grumbled and Harry laughed.