When Harry opened his eyes, he found himself surrounded by total darkness. The last thing he could remember was walking into the Forbidden Forest and letting Voldemort hit him with a killing curse. After taking a moment to process what that meant, and where he likely was, he realized he didn't really mind the darkness. It was quiet, peaceful even- certainly not a bad place to spend eternity, he thought to himself.
Without any way to track the time, he didn't know how long he sat there, just enjoying the calm. He never got hungry, he never slept, he just reflected on his life and those still living. But that calm shattered in an instant and the walls began to squeeze him, pull him. It felt like he was being dragged through a straw and he couldn't help it, he screamed. All he could think about was botched apparitions and splinching accidents and he panicked.
It felt like hours before everything stopped, and he found himself squinting against a blurry light as he greedily gulped mouthfuls of air. Absently, he noticed something soft wiping his face and wrapping around him. He was too focused on breathing again to really think properly.
When his vision finally cleared, the first thing he saw was the sweaty face of a woman lying in front of him. He didn't know who she was, but she was smiling, and her eyes shined with love and tenderness. "Hello there sweetling, you're even more beautiful than I expected."
It was then he happened to notice his hands, or rather how tiny they were. He jerked back in surprise when he realized they were literally baby-sized hands. "What the hell?" The sounds that left his mouth were more gurgles and noise than actual words.
A nurse picked him up and placed him in the woman's arms, he was still too shocked to complain. "He is healthy and strong my lady, what do you wish to name him?"
"Jasper- his name will be Jasper Arryn, after my uncle. Jon would appreciate it I'm sure."
The nurse smiled at her, "I'm sure Lord Arryn will love it my lady. They were very close when he was still alive."
He focused on his breathing, trying his best to calm himself before he passed out. I'm a baby. I'm a freaking baby! What am I going to do? Where am I? Why am I here?
His new mother pulled him against her breast as she cooed in his ear. The warmth and closeness eased his rising panic and he melted into her arms. Suddenly he felt rather tired, emotionally and physically he was spent, and he realized there was no point in fighting whatever this was. Letting out a long sigh, he decided he would figure everything out tomorrow. He cuddled into the woman and couldn't help the small smile forming on his lips. Maybe this isn't so bad after all, he thought to himself sleepily.
He shocked his tutors (They were a group of scholars that his parents trusted, they called themselves, "Maesters." Apparently, they served as advisors and tutors for nobles throughout the realm) with his development and rapid understanding of the world around him. He was speaking in full sentences by the time he turned two and was learning to read and write at roughly the same speed. He felt like Hermione, constantly reading everything he could get his hands on and badgering everyone around him with questions. He even begged Maester Colemon to send for more books from his order's headquarters, the Citadel. Something his mother Rowena teased him about mercilessly when she heard about it.
But it was through these books that he learned he was no longer in Britain, or even on Earth for that matter. He was in Westeros, a land steeped in magic and bloodshed and ruled from an iron throne. The continent was divided into seven kingdoms, eight if you counted the Iron Islands, and they were all governed in the name of House Targaryen. He lived in the Vale, one of the more Northern kingdoms, and astonishingly, his father was considered the ruler of all of Vale. While he wasn't a king, he was considered a "Lord Paramount," which was the highest tier of Lord below the king. Apparently, House Arryn had been ruling the Vale since the time of the First Men, well before Aegon's conquest and the subsequent unification of Westeros.
It was a daunting thought when he realized that he would have to one day take over for his father. But he refused to hide from his new-found responsibilities. Vale was his home, and it was his family that the people turned to for guidance and leadership, he couldn't ignore that. He spent months studying maps, local history, and everything else he could get his hands on. He knew he wasn't going to step into the role for years, decades even, but he swore he'd be prepared for when it happened.
Amidst all this research, he also started exploring how to harness his magic, which he thankfully still had. Every night he would practice for hours at a time, trying to build up his reserves so he could cast at least a couple spells in succession. Without a wand, casting took a lot more power, and unfortunately his core just wasn't at that level yet. Thankfully, Hermione had taught him runes while they were on the hunt, and those didn't require hardly any magic to power them. He wasn't NEWT level or anything, but he knew enough to strengthen things and ward them. With enough time you could do nearly anything with runes, assuming you knew the symbols.
It was for that reason he delved deeply into the magical history of Vale. The House of Royce as it turned out, was a prolific user of runes, many of which dated back to the First Men and the earliest uses of magic in Westeros. House Tollett and House Donnerly also had a history of rune use, although to a much lesser extent. As an unexpected bonus, his research led him to a fascinating exposition on skinchanging, the ability to enter the mind of an animal and control its actions. It sounded suspiciously like some form of legilimency mixed with familiar bonds, but it never really mentioned the specific magic involved. The wealth of knowledge and history covered in his family's library was simply astounding, but his progress had slowed considerably due to the Citadel's restrictive nature regarding anything magical. He was confident that with a bit more research he would be able to start practicing runic arrays based on the language of the First Men.
As the years went by, he found himself feeling less like Harry Potter and more like Jasper Arryn. While he never forgot his past, he had largely moved on from it, and did his best to find peace over the many regrets he had over that life. He had long since come to accept his place here, and for the first time in many years he felt like he truly belonged.
Rowena was the mother he always imagined Lily would be. Kind yet firm, she was constantly encouraging him to do his best in his studies, and she never gave an inch during an argument. Yet she was always there when he got sad or when he got restless. She would play with him or read with him; she even sang him to sleep. He knew he shouldn't need these things, but he couldn't bring himself to ask her to stop, so he just guiltily soaked up her attention. His father was much more distant though, and while he still cared about Jasper, he rarely showed it. They never just talked or even played, everything always had to be a lesson with him. He felt like he had no real relationship with his father, and it bothered him immensely. But for the first time he could remember he had his mother, and that was enough for him.
However, a little after his ninth birthday, something happened that would change his life forever. One of Jon's wards, Robert Baratheon, had a bastard child with a commoner in Vale. By the time Jon found out, the babe had already become a toddler. He was furious and started making arrangements to leave her in the care of one of his vassals, something he felt Robert should have done the moment she was born. Rowena argued against this fiercely though, and she pleaded with him to let her raise the child in the Eyrie with Jasper. She had desperately wanted more children but hadn't been able to have any after he was born. It was the only time he could remember her openly disagreeing about anything, and after a tense week of heavy arguments, Jon eventually gave in and Rowena formally adopted Robert's daughter, Mya Stone. Legally, this was essentially the same as a regular ward. She didn't get any new titles, nor would she inherit anything upon Jon or Rowena's death. It was more of a public statement that, bastard or not, she was now a daughter of House Arryn and was due the honor and respect associated with that position.
In his past life, Jasper suffered years of abuse from his relatives. This was something that affected him deeply and made him desperate for any kind of family and acceptance. So, when Mya came to the Eyrie, he couldn't help but feel drawn to her. After years of being alone, he finally had a chance at having a sibling. It wasn't long before she started following him around, constantly badgering him to talk with her or show her things, and he was soaking up every minute of it. Somehow, this devolved into bouts of "adventure" and she would talk him into exploring the grounds with her or playing with her. On a more notable occasion, she even convinced him to sneak her into the stables so she could meet the ponies. She was four years younger than him, but she was cute and extremely curious.
It was because of this constant shadowing that he wasn't really surprised when she confronted him about his magic. At five, she may be young, but she was very intelligent. She had caught him conjuring things when he thought he was alone.
He swore her to secrecy and explained that he had magic and that it frightened most people because it was different. She had found it fascinating and instantly demanded he "make some flowers" because the Eyrie had only grass for a garden. While it took some leg-work, conjured plants can't bear fruit after all, he managed to make his sister happy. He had seeds from Highgarden sent through raven and planted them in the garden in Eyrie, then he used magic to speed up their growth rate. Within two weeks of her demand, the garden was full of roses and apple trees. Mya thought he was the coolest brother ever, a fact she began to frequently remind him of.
However, what he forgot to anticipate was how everyone would react to their sudden appearance. Most people took it as a sign from the Seven, which was helped by the fact that there were only seven trees and they were planted in the shape of a star. Not to mention that the "garden" was actually a failed godswood, and hardly anything was able to grow there in the past. Some inner-Marauder part of his old life surged forth and he felt the need for a prank. Jasper planted a weirwood seed right in the center of the "star" and used magic to speed things along without anyone noticing.
When the weirwood suddenly appeared in the middle of the apple trees, carved face and all, no one knew what to believe. Some said that the Old Gods and the Seven were fighting for the Eyrie, others said it had been the Old Gods restoring the godswood.
Jasper just found it hilarious how far off everyone was. Old Gods or no, he still found himself drawn to the heart tree, fascinated by the magic he could feel flowing through the weirwood. Although he didn't pray there, he often came to sit beside it and feel the magic dancing just beneath its surface.
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AN: For those who are curious, Rowena is an actual character in ASOIAF, she simply died before she could have any children. She was Jon's second wife as well as his cousin. (Lysa Tully was his third wife in cannon) Jasper is named after Jon's father, who is also a pre-existing character in ASOIAF.
Notes. For those that know one 'verse, but not the other:
 Apparation is a spell that allows someone to teleport from one location to another. It requires the caster's focus to be maintained the entire time or you could suffer splinching, which is when you don't rematerialize with all your body parts. This form of magic is most often described as feeling like being squeezed through a straw, which is why Jasper thinks of it during his "re-birth."
 Jon is a Lord Paramount. All other Lords in Vale swear fealty to Jon, but he still swears fealty to the King of the Seven Kingdoms.
 NEWTs are the graduate level testing for Hogwarts, essentially your final grades for AP level courses.
 Legilimency is the magical art of reading someone's mind, occlumency is the only known defense against this.
 The Eyrie is the seat of House Arryn, it's an ancient castle in the Mountains of the Moon.
 The Faith of the Seven are the Westerosi equivalent of Christianity, only they believe there are seven separate aspects of god. Individual aspects are called faces, and they represent each of the roles God takes in his duties as the divine. Technically there is no specific gender for this deity, as it wears the faces of both a man and a woman depending on the role it is in. Thus, it is most frequently referred to as "the Seven Who Are One." While people pray to the individual faces, a seven-pointed star is the official icon worn by the Faith and its followers.
 A godswood is a small collection of trees that surround a heart tree, this is the primary place of worship for followers of the Old Gods. A religion centered around nature, followers believe that spirits or gods inhabit the rocks, streams, mountains, and forests that make up the world around them.
 Weirwood trees are considered sacred to the followers of the Old Gods, when one grows inside a godswood it is then referred to as a heart tree. Most weirwoods have faces carved into their trunks. This was done by the children of the forest in ancient days and is now done by local followers of the Old Gods.