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Tom found himself resurrected long before he had anticipated. His shade bound back into a body with the help of his soul. Or at least one of the pieces of his soul. As much as he detested loosing his diary like this - there could have been other uses for it, after all - it was balanced out by the fact that it couldn't get lost or destroyed anymore.
He had made the Horcruxes for this in the first place.
To return no matter what.
Though, returning like this also lead him to have other senses, a different feeling of both his magic and general awareness of the other pieces of his soul. For Tom could feel that, despite him emptying the diary, there were still just as many pieces of his soul scattered as he had assumed there were in total, including his diary. There was only one conclusion: he had made another Horcrux. This one without actually planning to do so. Without the proper ritual and precautions.
Yet, Tom already knew when it had to have happened.
There was only one event in recent history where he felt so much pain that the pain of ripping his soul apart would go unnoticed.
When he attacked the Potters.
As it had only been a few years since then, certainly not enough for the boy who reflected his killing curse back at him to be old enough to attend Hogwarts, he wasted no time seeking the child out. Maybe the reflection of the killing curse was already a sign that he was a Horcrux... no, that couldn't be it. It was possible to kill a Horcrux within a living being together with the living being. No, the reflection must have been a ward of some kind. One like the ones he put on Nagini, just far more subtle.
When he found the child, Tom was surprised by the neighbourhood he found himself in. A disgusting muggle one, where every house looked the same for as far as the eye could see. The only real differences being in the bird baths and the cars in the driveways. This was where the child was kept? Sure, none would think to look in such a bland neighbourhood, but it was hardly protected. Tom certainly could walk right in. No strong wards or other layers of protection in his way.
Nothing to stop him from spelling the door open.
Nothing to stop him from killing both the skinny woman and her fat son.
Nothing to stop him from standing in front of the small child, who almost looked like a house elf with his tiny frame and the rags he wore. Locked in the cupboard beneath the stairs as he was.
"Are you here to take me away?" Bright, yet unfocused, green eyes asked as the Potter child looked up at him.
"Take you away?"
"Aunt Petunia said that bad children get taken away from good families so they won't bother anyone ever again."
Tom chuckled. This was too easy. He held out his hand. "Sometimes good children get taken away from bad families. And looking at you, I can tell that you're a very good child, aren't you?"
The boy looked at him doubtfully. "I try." He looked back and forth between Tom's face and hand. "But aunt Petunia says otherwise."
"Then... try being a good boy for me."
Hesitantly, the boy took his hand. "Okay."
Tom led him out of the cupboard and out of the house. Barely bothered with the flicker of magic that would hide his unmistakable signature. He was more focused on breaking any of the spells that usually lingered on magic children. Not necessary ones placed there by people, but ones that took on a life of their own. Like the Hogwarts registry. He wouldn't let that old fool take away this boy, not when he was someone so very special to him.
Having Harry present as an omega was truly a gift.
It happened sooner than the average presentation, when he was barely 13 years of age. But given how much Tom utilized his alpha pheromones to keep the boy at his side and happy, it was to be expected that he would mature sooner.
The first few strings of heat barely warmed Harry's body before he crawled into Tom's bed. A habit he had developed back when he was young and plagued by nightmares. One that Tom merely allowed because having the boy so dependent on him was exactly what he aimed for. And now...
Tom sucked in deep breaths. Let the taste of Harry's awakened scent linger on his tongue.
"Master, I...," Harry trailed off. Clearly not knowing how to voice his desires and needs. Pure and untouched - but not for much longer.
Tom shushed him. He pulled the boy into a comforting hug. Let the little omega bury his face in Tom's neck, where his alpha scent was the strongest. Tom let his hands wander over Harry's body. Over his back, down his chest and sides. His hands seemed so big when compared to the small boy's frame. One hand was easily big enough to grab both of Harry's arse cheeks at once. His middle finger wandered between them, until it reached a spot where Harry's sleep pants began to get soaked with his slick.
"Don't worry, I will take care of you." He rubbed his cheek on top of Harry's head, wild locks pleasantly scratched against his pale skin. "For as long as you are mine."
"I'll always belong to you, Master," Harry easily vowed. Just as Tom had taught him.
"Good boy."
Tom expertly moved them until Harry laid underneath him, bared of his clothes. His eyes hazy and unfocused with heat instead of the weak eyesight he was born with. Harry frowned at their position, as instincts he couldn't comprehend made him move to all fours, presenting himself to the alpha above him.
"You are too sweet, dear Harry." Tom's hands slid appreciatively over the bare skin of Harry's back until they reached his arse. Each of them grabbed a cheek and pulled them apart, until Harry's leaking hole was presented to his eyes. "Even here." He pressed one thumb against the small opening. His eyes greedily ate up the sight of it easily sliding into Harry. He thrust it in and out a few times. Something that only made Harry moan with unfamiliar pleasure and had Harry's body produce even more slick to entice Tom into fucking him more. His other thumb joined it not too long after. He used his grip to spread Harry's hole. Far enough for him to appreciate the slick pink insides that would only ever belong to him.
"You'll always be my good boy, right?" Reluctantly, he moved one hand from Harry to rid himself off his robe so he could claim his boy once and for all.
"Always."
"You'll always be by my side, right?" Tom collected some of Harry's slick with his fingers and used it to lubricate his cock.
"Always!"
"And above all, you will be my good little omega, always prepared to take me and willing to carry as many children as I want you to, right?" Tom grinned as he rubbed the head of his cock over Harry's small hole. Almost mesmerized by how it already tried to suck him in.
"Always, Master!"
Without warning, Tom thrust into Harry. Until he was completely sheathed inside the smaller body. He let out a groan at the feeling of being hugged by Harry's tight, hot walls. A sound that went unheard compared to Harry's screams as they both lost themselves in Harry's heat.
When Tom entered his chambers, it was to a sight he would never tire of.
Harry, his beautiful omega mate, heavy with his child, with his heir. He was curled up on their bed. He wore one of Tom's robes that was far too large for his still small frame. Not that Tom could ever get himself to mind it. Not when it meant that Harry was completely wrapped in his scent even when he was gone, while the too big collar also showed off the deep mating bite Tom left him with.
Harry didn't wake as Tom prepared for bed. Barely even reacted with a hum when Tom finally joined him and curled around him. Maybe Tom should have waited a bit longer before allowing Harry to actually carry a child given how draining this pregnancy was, and how it would be safest to not let Harry birth naturally.
Yet...
Tom laid a hand possessively over Harry's stomach. Felt the magic of their child answer to his touch. Already so strong, bound to grow even stronger. Already so loved, far more than either of them were. Not that Tom had ever considered love as such a fundamental part of his plans before. But given that both Harry and their child, and any future children they might have, were irreversibly his, Tom couldn't bring himself to mind.