I do not own Harry Potter or The Mortal Instruments series, they belong to J. K. Rowling and Cassandra Clare respectfully.

WARNING: Will contain SLASH, HET, mentions of MPREG, violence and swearing. This is also AU from the Harry Potter series. Non-human Harry. Not beta'd.

Pairings: Harry/Alec, Jace/Clary, Simon/Isabelle, Luke/Jocelyn

SET: After City of Glass, so what happens after never happened. Also, Alec and Magnus never got together (I love that pairing though).


Clary POV

The large throne room of the Seelie queen was beautiful. Blue roses seemed to grow all around them, and their roots carpeted the floor, mixed with moss and small yellow flowers that Clary couldn't name. Crystals from the ceiling and walls shone fractured light around them, sparkling off the glitter that dusted Magnus' skin and the armour of several faeries that stood silently around them.

But Clary couldn't really appreciate the effects for her eyes were solely on the shadowhunter in front of her that was being studied by the Seelie queen's grandson, a handsome faery of six-feet with a shock of messy black hair and stunning green eyes that looked like they were made from precious stone. The faery by the name of Hadrian, a name so mundane that Clary had asked Jace about it and was informed that Hadrian was also one-quarter human. His mother was a faery who fell in love with a half-faery. It was, Jace grudgingly admitted, why they were going through with this in the first place: marrying off Alec to Hadrian in an attempt to stave off a war between the faeries and their allies with the shadowhunters. Not that the rest of the shadowhunters knew what they were doing. They were in the middle of mediation with one of the Seelie queen's representatives over the deaths of thirteen fair folk. The faeries wanted justice and blood for their slain kin.

"I did not expect a man," Hadrian's voice, British and deep, rumbled. "How do you plan for us to have the children you so desperately desire, my queen?"

"Magic my little one," the queen frowned, an expression Clary noted with resentment, which did not detract from her beauty. "We will create a womb inside him."

Jace stiffened and Hadrian's eyes flickered up to meet the cold golden eyes of her boyfriend.

"He's a shadowhunter, a warrior. He is not made to carry children in any capacity. Why would I want someone to carry my child when they would most likely lose it?"

Clary grabbed Jace's hand and gave it a comforting squeeze. She could see Alec tense up even more than he previously was. While they were willing to give this a go, it also hinged on Hadrian's co-operation.

"Hadrian," Magnus spoke up smoothly, "do you not trust me or my magic?"

The faery turned his attention on Magnus.

"I do, my friend, however you know of my… apprehension over the subject." He sighed and went back to studying the silent Alec, his fingers dancing over Alec's covered abdomen.

For once Magnus looked very serious.

"I will give you whatever it is you desire in this," he promised solemnly.

Hadrian nodded his head in thanks before turning back to questioning his patient queen.

"And is this not an attempt to control me, grandmother?"

"Your questionable appetites," here she glanced over at Magnus, "need to be curbed. I will not have my grandson be involved with wild vampires or warlocks."

"I would not call Raphael wild," Hadrian retorted lightly. "He and I are very much tame in comparison to my choices in my younger years."

Hadrian cocked his head and reached up to tilt Alec's head back.

"Now tell me, Shadowhunter, on why you decided to be the sacrificial lamb in amongst all these plots and plans."

Alec, whom this far had remained silent, finally spoke up.

"I'm doing what needs to be done," he said.

"By marrying yourself off to a faery?" Hadrian laughed softly and Clary immediately thought of wind chimes. "Oh you poor shadowhunter, you have no idea."

"Magnus gave me a vague inkling," Alec reported a little dryly.

That was true, Clary thought, remembering how Magnus had endorsed Hadrian. Out of all the fair folk he was the least vindictive, least bloodthirsty and least manipulative. Hadrian, Magnus had gone on, was someone that would look after Alec and keep true to his word.

Delight filled Hadrian's eyes.

"Not a spiritless human after all," he turned to look at Jace then. "He is your Parabatai, how do you feel about him being sold into marriage?"

"If he is harmed or treated in any way less than a king the possible brewing war between our species will be the least of your problems."

Jace sounded almost cheerful and Isabelle, who stood tense on his other side, snorted.

"He is a strong, capable warrior, not a weak-minded mundane," Jace continued, "He has a fire inside him that burns as bright as any star. Family is the most important thing to him, and to us. Damage him and I will kill you."

The faeries around them pulled out swords at the threat toward the prince, but the queen raised a hand to still their movements. Alec had also looked round to stare at Jace, blue eyes wide and bright.

"I like you Jace Herondale-"

"Wayland."

"-you speak a truth that is both blunt and charming." Hadrian walked over to him. "I swear I will not harm your brother in any way. And seeing as I cannot lie…"

"You can twist the truth," Isabelle pointed out sharply. "You could get others to harm him."

"Izzy," Alec warned; eyes on the angry faeries around them.

"Then, Isabelle Lightwood, I give you my honest word that I will protect your brother from harm if it is within my power to do so, be it from me or anyone, or thing, else."

Isabelle still did not look satisfied. Neither did the rest of the group barring a smiling Magnus.

"Well then," the warlock said cheerfully, "I assume that this concludes negotiation?"

"You assume correctly," Hadrian looked over at his queen. "I will accept this shadowhunter as my betrothed."

The queen gave a dark smile and stood from her throne.

"Then it is done. The boy shall remain with us over the next few days before the wedding." Her challenging gaze swept over the remaining shadowhunters, "So that the new couple can get acquainted with one another."

They had expected this but the thought of leaving Alec with potential enemies still left Clary with a sense of dread.

"No food or drink will bewitch him," the queen continued to speak, "my grandson has a gift for his betrothed to protect him from any of our so-called trickery."

Hadrian pulled out a simple bracelet made from twine that held a rune-engraved stone. He walked back over to Alec and, after motioning for him to lift his arm, tied it around his wrist.

"Magnus himself created it," the queen pushed a strand of her fiery red hair behind her pointy ear. "As I believe you know."

"Thank you," Alec fiddled with the stone, head turned down.

"Now I believe that it is time to end this little meeting," the queen motioned for her guards. "They will kindly escort you out."

Magnus bowed. Clary followed his example. Jace and Isabelle more reluctantly.

As the guards ushered them out, Clary tried to keep her sights on Alec, noting his hunched shoulders. Not for the first time did the thought of what Alec was doing was too great a sacrifice for what they were attempting to prevent. But then her view was blocked by the heavy curtain of struggling dragonflies and she was led off to a portal to send them back to the mundane world.

Hadrian's POV

"Keep your back straight and do not hide your face," Hadrian ordered softly after the shadowhunters left. He was now leading them to his chambers, away from the prying eyes of his grandmother and her spies. "That shows weakness. Everyone down here will exploit that."

The blue-eyed young man followed his advice.

"You are a soldier, show that and it will minimise the number of faeries that will try their plots on you."

Alec nodded.

"You can speak, you know," Hadrian said with a sidewise glance at his silent betrothed.

"There is nothing that I wish to say," Alec replied rigidly.

"No?" Hadrian was amused. "Do you not have questions? Like why the queen would settle to marry her grandson off to a shadowhunter that will not bring justice to her people? Or what she may or may not have planned if she is deciding to go to war?"

"It's not like I would get a straight answer," Alec argued. "Magnus told me that the queen does not trust you."

"Of course he did." Hadrian laughed. "And he is right. She may love me, but she does not trust me. You cannot trust anyone down here. I do not know her plans so I can only assume."

"But you won't tell me," Alec correctly guessed.

"Would you tell me of your plans?" Hadrian countered. "Besides, I would never utter aloud my thoughts here, even to myself. The walls have ears, remember that."

They remained silent until they entered Hadrian's chamber behind a veil of white lilies, woven together to create a curtain of white and green. The room itself was large, with a giant bed that could comfortably fit five people with room to spare facing the entrance, and a large sofa against the wall. A desk was off to the side, seemingly coming out from the wall itself and only had a photo frame on the wooden surface, showing a black and white photo of a baby, and the floor was all grass, a rich dark grass that tickled Hadrian's bare feet pleasantly and he stepped onto it.

"I do not spend much time here, I much prefer the mundane world," Hadrian admitted freely as he unclasped the cloak from his shoulders.

Alec stood in the middle of the room, taking his surrounding in with a trained eye.

Hadrian sat down on the soft sofa and patted the seat next to him. Alec took a deep breath and joined him, sitting so stiffly that Hadrian had to bite back a laugh.

"Now that we are to be… married," Hadrian ran a hand through his messy hair. Alec's eyes followed the movement, hand clenching as if to restrain from reaching for a weapon. "We should get to know one another, no?"

Alec swallowed. "What do you want to know?"

Hadrian grinned and shifted to cross his legs. "First I ask a question and you answer, then you do the same for me. Nothing too personal, I promise."

"Alright," Alec licked his lips.

"Great! Okay, what is your favourite colour?"

Alec blinked. "Green," he peered up at Hadrian wearily, but the previous suspicion that seemed to cling to him was slipping away. "What is your favourite food?"

"Treacle tart," Hadrian immediately answered. "While I do enjoy the food of the faery there is something about mundane food that's better. Now, your favourite season?"

"Winter," Alec hesitated, "I prefer the cold. And I like snow." He flushed but Hadrian smiled.

"I prefer spring myself, love the rain. It drives my grandmother up the wall though."

A flicker of amusement crossed Alec's face. "I can imagine." More relaxed now, Alec settled more comfortably in the sofa. "What was your mother called?"

"Now we are getting a little personal," Hadrian stated. "But I will indulge. Her name was Lily and she was a beautiful woman, or so I was told." He scratched his chin. "Both she and my father were killed when I was a baby by a warlock." At Alec's stricken look Hadrian leaned in closer. "It was centuries ago and I never knew them. I feel a loss at what could have been and I have grieved, but the mere mention of them does not sting."

"I'm still sorry," Alec apologized. "I didn't really think."

"The charm of shadowhunters," Hadrian teased. "As I have said, it was over two hundred years ago. Time has healed what wound I had over their deaths. Besides I know the name of your parents, and I have even met some of your ancestors so I believe it is only fair for you to know the same."

"You knew my ancestors?" Alec sounded incredulous.

"I'm not surprised that Magnus kept that from you," Hadrian spoke ruefully. "I knew your great, great, great-grandfather, Gabriel Lightwood. I didn't think much of him to be honest. Though that wife of his kept him in line."

Alec stared at him.

"What? I knew shadowhunters before you. I was there for the battle and everything, thanks to Magnus and his compulsion to help the Herondale boy. Although time has tempered the Lightwood arrogance it seems." Hadrian continued to speak, realising that this was calming Alec, at least for the moment. "There are many stories I could tell you. Like how Gabriel's father turned into a giant worm," Alec choked, "or how much Gabriel's brother loved to travel the world while his little brother lived in Wales, and how he faced many demons. I could tell you how their son fought to defend a group of mundanes from a swarm of demons with only himself and a broken sword and lived to tell the tale. Now that was a fearless Lightwood. The only Lightwood that I was reluctant to be in the same room with, actually."

"How- How did he get turned into a worm?" Alec asked.

"It was poetic justice," Hadrian said with relish as he remembered. "He was a lying, cheating worm in life, and when he succumbed to the demon pox, irony chose to turn him into that form."

"Dragon pox?"

"Your ancestor had an acquired taste when it came to bed partners," Hadrian told him.

"Oh," Alec stared at the wall in a daze.

Hadrian felt for him. So much has happened in such a short space of time, it was a wonder he was keeping it all together.

"Now, I think you've had asked enough questions. It's my turn." Alec blinked and focused back on the faery. "Now, if you had to go anywhere in the world, where would it be?"

"I think I would like to go to Rome," Alec said, "I was told the institute there is second to none."

"Besides the institute, where would you go?" Hadrian reiterated, "Just to act like a tourist."

"Oh," Alec shrugged. "I never really thought about it. Maybe Ireland? I would love to see the Giant's Causeway."

"It does have an appeal," Hadrian agreed.

Alec thought for another question. "Vampires or Werewolves?"

"Werewolves," Hadrian said immediately, "Though I do not mind sharing the company of a vampire as long as they keep their teeth to themselves. And You?"

"Werewolves," Alec agreed.

"I think, Alexander, that we will get along well," Hadrian declared.

The shadowhunter took a deep breath. "It could be worse. And I trust Magnus when he says that you're not like other faeries. You were also given little choice in this matter as well."

"A very grown up response," Hadrian praised.

"Magnus made those points clear," Alec confessed. "And I could either be miserable and suffer through this marriage or choose to be happy."

"You really do sound like Magnus," Hadrian shook his head.

"He told us about you. About you and him I mean," Alec's fingernails dug into the palm of his hands. "He says that you have plans of your own, plans that might benefit us?"

"I'm a faery, for every situation we find ourselves in we make plans that make us come out on top." Hadrian said, evading the not so subtle attempt to ask where his loyalties lay. "I will tell you this though, family is paramount to me. I will do anything for family."


The idea came to me and I couldn't shake it. I don't know when I'm next updating but hopefully soon. I also don't know where this is going, I'm just winging it at the moment.

One thing I like to point out is that there needs to be more HP/MI crossovers. Particularly Harry/Alec or Harry/Magnus pairings. So, you know, start typing? :D

I do have some ideas that if any of you are interested in you could do.

1) Harry was adopted by Hodge. By the first book in the MI series he is a shadowhunter and friends with the Lightwoods and Jace. Alec already has a crush on him?

2) Harry is transported into the shadowhunter world when he was 11 through touching the Mirror of Erised and gets adopted by Jocelyn and is Clary's brother. Again a Harry/Alec pairing.

3) Harry is a Phoenix that is Magnus' companion. At the end of HF Harry heals Jonathan. Possible Jonathan/Harry pairing?

4) Harry is a Warlock and is Magnus' partner. Magnus calls Harry in to help them with Valentine.

5) Again shadowhunter Harry that is friends with the Lightwoods. When Luke meets him sparks fly? Mates? Or just attraction? Luke/Harry pairing.

Etc.