Harry's Corruption
It was a cold night at the graveyard in Godric's Hallow. Voldemort stood before the graves of James and Lily Potter. He was preparing to conduct a Necromantic ritual, one far more complex than he generally used. He would return the souls of Lily and James to their bodies before transforming them into immortal beings. The only non-dangerous immortals he knew of were the fae. Thus the ingredients needed for the ritual were costly, but gaining Potter's loyalty was far more important to Tom than all the gold in the world.
Lord Voldemort drew the ritual circle with practiced ease. With a wave of his wand, he unearthed the caskets of the Potters and removed the lids. With care, he poured the potion on the Potters' corpses, which glowed with dark energy. The return of their souls to their bodies was the first and least potentially tricky part. This was a step he generally skipped, soulless minions being far more loyal than ones with souls. Next, he sent a prayer to the fairy queen, which was answered promptly when the bodies of the Potters glowed with pure white light which smothered the dark light completely.
The next part would be far more tricky. He had to regulate their bodies to ensure they accepted the transition into fae. One lapse in concentration could be fatal to himself and the Potters. Tom was good at concentrating, being that it was an essential part of magic.
It took hours of concentration to complete the process, by which time the Potters awoke.
"What did you do to us, snake-faced bastard? I was making love to my wife in the afterlife and suddenly ended up here," said James.
"I brought you back to life in order to gain the loyalty of your son," replied Voldemort.
"I must admit your plan is spectacular," said Lily. "Gifting Harry with his Mother and Father brought back to life is by far the best way to get on his good side." James nodded his agreement.
"To Hogwarts," declared Voldemort.
Harry was brooding in his bed. His friends were acting strange, and he was determined to get to the bottom of it.
Just then, Tom entered the dormitory, causing Harry's eyebrows to fly skyward.
"What do you want?" asked Harry.
"I brought you a gift," said Tom. Just then, Lily entered the room, followed by James.
"Mum, Dad," said Harry, with tears in his eyes. With a joyful heart, he hugged his parents. "How?"
"Necromancy is powerful magic, Harry," said Voldemort. "I returned their souls to their bodies and turned them into fae."
"How can I repay you for bringing back my parents?" asked Harry, full of emotion.
"Join me," said Tom.
"You've got it, Tom," said Harry. Three for three. It was official, Tom could convince anyone anything.