This is an AU in which Narcissa went with Sirius when he ran away from their family. It's going to be multi-chaptered and features trans!Narcissa as well as a variety of different relationships including Sirius/Narcissa so be warned for incest in later chapters. If you like the first chapter, please let me know in the comments!

oOo

The rude comments didn't hurt half as much as they had used to before, and certainly not as much as the slap to her cheek that followed. Narcissa bowed her head further as tears stung in the corner of her eyes, attempting to ignore the burning pain in her face. Next to her she could vaguely make out her younger cousin doing the same.

They must look quite the pair. Sirius with his messy long hair and some dry mud on his forehead, grin still firmly in place despite his lip bleeding from where aunt Walburga had slapped him with her wedding ring.

She herself with a slightly ragged dress and short pale blonde hair the colour of the dye on Sirius' shirt, dyed less than an hour ago in the fields surrounding her parents' house.

The cousins eyed each other and Sirius winked at her as aunt Walburga went on and on, eventually mentioning how much both of them had failed to become heirs of their family.

Not like I truly want to become an heir of this forsaken family, dear aunt. A voice in the back of her head whispered, but she didn't dare say it out loud. Sirius however, voiced her thoughts almost exactly. "Good thing Cissa isn't our heir then, mother."

"Make a suggestion like that again and you wille regret it severely, Sirius." His mother snapped, and Narcissa casted her eyes down immediately. "You can put a dress around the child and dye the hair in this hideous colour, but you can't make him a girl. Off you go, both of you."

She stayed silent as she made her way upstairs with Sirius, not sure what she was supposed to say now and not sure if she could say it properly anyway. Narcissa glanced at her cousin and at seeing he was about to cry stopped in her track and hugged him tightly.

"Your hair isn't hideous Cissa, I love it." He muttered, wrapping his arms tightly around Narcissa. She smiled slightly, looking up at him with a grateful smile and he chuckled, a single tear dripping onto her face. "I mean it, you look gorgeous."

Narcissa had a hard time believing it but nodded regardless and wiped away the rest of his tears gently, then lead him to her room. "You will be staying at the house tonight, won't you? I heard mother discussing where you and Regulus would be sleeping."

They often did when one half of the family had come over, especially if either father or uncle Orion had gotten too drunk to apparate back. Though it allowed for the five cousins to grow closer, they all knew it was also a way their parents checked up on how the others were treating their children.

Too much kindness was not allowed in a Black house hold.

"I'll probably just join you, so prepare to sleep on the ground Cissa." Sirius grinned at her now, sitting down on her bed. His hands spread across the silk sheets to straighten them and he looked up at Narcissa with raised eyebrows.

"The blonde looks good on you, but I think you should skip dinner if you want to avoid aunt Druella having a fit about it."

"Well, let her. She's going to be furious either way, as will father."

Narcissa knew her parents would be more than furious, she knew what they'd do to her but she refused to show her fear to Sirius. There was something about being the older cousin that made it feel like she was supposed to be the one that comforted him, and not the other way around. "Do you really like the colour?"

From the moment she'd decided she would go through with her transition no matter the consequences, she and Sirius had also agreed that she would dye her hair. She wasn't sure about the reason behind it, but she felt more rebellious and confident than she had in months so it must be working.

Still it was a relief when Sirius nodded, grin still in place. "I love it, Cissa. It looks great on you."

oOo

Dinner was an awful experience, as had been expected. Mother started to yell at her the moment she entered the hall, and while father stayed silent for the time being Narcissa knew better than anyone that his fury would come later.

After only a few quick bites of food she was sent upstairs by Cygnus and she tried her hardest to not look at Sirius' worried eyes as she quickly made her way back to her bedroom.

Father would finish his meal first, then come upstairs for her. Narcissa knew the way this went by heart, and even though she had convinced herself she should be used to it by now she was still nauseated by the fear of what was about to happen.

She sat down on her bed and closed her eyes for a few moments until her door was pushed open roughly to reveal her father and her eyes shot open to look up at him in fear.

Cygnus stayed silent and Narcissa didn't do anything, waiting for him to move as if she was petrified.

"You're a disgrace to this family, son."

"I realize that, father."

A slap in her face, but she knew better than to give a reaction. Father had made his way over to her and Narcissa swallowed visibly as she tilted her head to look up to him. "I won't allow this freakshow to go on anymore, we had one agreement on it and you failed Ophelius."

Though his voice was still calm, Narcissa recognized the anger behind it and knew what was about to come. Despite knowing it wouldn't make a difference, she whispered "my apologies father, I shouldn't have dyed my hair."

"You shouldn't have. You shouldn't have gone out with that traitor, you shouldn't have worn a dress, you shouldn't let him call you by that shameful name! But we'll just give you a lesson, won't we Ophelius?"

His voice was losing the calm tone and becoming more aggressive as he went on, and Narcissa nodded silently. "Yes, father."

Her tears already stung with tears even before Cygnus lifted his wand and muttered the curse that she had grown so used to over the years. 'Crucio.'

Narcissa lost track of how long it had been, was only aware of the fact that it could end when the curse stopped for a short while to be replaced by a kick to her stomach or a fist in her jaw, and her throat felt raw from how much she'd screamed.

No matter what she told herself, she hadn't grown used to this experience just yet and frankly she wasn't sure if she ever truly would. But eventually the worst pain stopped and she only heard a door being slammed before everything fell silent again.

Narcissa was crying uncontrollably, shivering violently as she tried to sit up against her bed but failed.

It was one of the most gruesome things she had discovered about the cruciatus curse. The pain didn't stop when the curse did, but there was a period after it ended where her entire body felt like it was still burning and she wasn't able to move normally. Defeated, she closed her eyes.

The door opened and she looked up startled, half expecting her father to have come back. Instead Narcissa met the eyes of Sirius and gave him a half smile, hoping he'd just go away again.

Of course Sirius did no such thing and instead he closed the door behind him and kneeled down next to her with a worried look, he took her hand gently and shook his head. "What the hell does he do to you Cissa?"

"It's nothing." Narcissa muttered, her voice more croaked than she'd expected. "I was being an idiot."

There was a moment of silence between them and Sirius sat down next to her, helping her sit up straighter by supporting her side. "Bullshit."

Narcissa didn't answer him this time and blushed deeply when she felt a few more tears fall down her cheeks, she did hate it when others saw her cry.

Another silence and this time it lasted longer, Sirius was looking down at their hands with a furrowed brow until he spoke again at last. "We're leaving."

She froze. "What?"

"We're leaving."

He didn't give an explanation, didn't say anything more than those two words and it infuriated her. Narcissa narrowed her eyes suspiciously and shook her head. "We can't, they'd never let us go outside at this hour."

"No, we're leaving home. Running away, getting away from this fucked up place." Sirius now stood up and looked down at her, she was suprised so see his eyes filled with excitement.

It was as if he'd been waiting to say this out loud for quite some time, which Narcissa suspected wasn't far from the truth. "At least I'm leaving, and I'm not going to leave you behind."

"You're not even joking, are you?" She brought out, shakily standing up as well but immediately taking place on top of her bed. Sirius shook his head.

"I'm not joking, they're treating us like fucking animals Cissa. We're leaving, you're coming with me okay? They're only going to hurt you more if you stay, you know that." He was talking fast and moving his arms as he did, as if that would make Narcissa more convinced of this idiotic plan.

"I know where we can go, I've been planning this since forever. Come with me big cuz..."

Sirius fell silent and sat down next to her again and carefully pulled her close to him. Narcissa let him hug her and in that moment he knew he'd won already, but she wrapped her arms tightly around the slightly younger boy and shut her eyes closed tight.

"Where would we go Siri?"

oOo

Sirius had indeed been planning this for a long time, he had it all figured out. After both of them had, as quickly and quiet as they could manage, packed their respective bags with anything they didn't want to leave behind he took her hand tightly in his own and met her eyes. "We're going to James' place, and see what we'll do from there. Trust me."

She wanted to protest immediately. Narcissa'd never exchanged more than a few words with James Potter, and those occasions were only a bit of quidditch rivalry, and of course he'd welcome Sirius with open arms but surely not her. She was everything James Potter was so much against.

He kept looking into her eyes as he repeated the words. "Trust me, Cissa." Sirius whispered and kissed the corner of her mouth softly, a gesture they'd shared since they were little as a way to comfort each other. "Just trust me alright?"

And for some merlin forsaken reason she did.

Narcissa apparated the two of them to a place just outside the manor's grounds where she knew no one inside the house would see them, and both she and Sirius took hold of their brooms.

The fact that they were truly doing this sparked the same excitement in her as she'd seen in her cousin's eyes, and she could barely keep herself from grinning as she mounted her broom.

They both loved flying, they played quidditch for their respective house teams and often competed at night, but there was something about flying away that made it even more wonderful.

Narcissa resisted the urge to close her eyes as she felt the wind against her freezing hands and ears, but despite the cold she loved it. Sirius flew right in front of her, knowing the route by heart and she suspected this was far from the first time he had gone to James this way.

The rush of adrenaline lasted for approximately ten minutes, after which Narcissa spend the remaining five of the flight in complete terror. Sirius may have been prepared for this, perhaps had planned on it from the moment he got sorted into Gryffindor and was labelled a traitor, but she had not.

She had planned to do whatever it took to become one of the high class ladies of their society, had spent hours and hours not coming up with an escape plan but with learning whatever she could so she'd be allowed to stay.

When Sirius eventually landed in front of an ordinary looking house and turned back to her, she met his eyes with a fearful look and it seemed he understood without any explanation.

She'd had a future in their family, and despite how much pain and effort went into that future it had been everything she had wanted. She'd thrown it all away now, Narcissa wasn't foolish enough to believe her family would take her back even if she turned around right now.

Once they noticed the two of them had gone they would be burned off the tree like Andromeda before them.

"You okay?"

Sirius was now standing in front of her, grin firmly in place and broader than before now that they were standing in front of their safe place. Narcissa nodded. "Just... I can't believe we did this, we're doing this."

He nodded back at her and put his arm around her waist chuckling. "You still trust me, right? It's going to be fine, Fleamont and Euphemia are the best."

With that they walked to the door and he knocked a few times. Though it was late in the evening it didn't take too long before James Potter opened it in his pyjama's. His mouth formed a lazy grin at seeing Sirius and then he raised his eyebrows with a much more alert look upon seeing Sirius wasn't alone. "Mate? What's your cousin doing here?"

"I'll explain, let us in first Prongs." Sirius didn't wait for an answer but James didn't seem angry when he just entered the living room, instead her turned to Narcissa with a confused shrug.

"Come in, I guess."

oOo

Euphemia and Fleamont were called downstairs after Sirius had explained everything to James in detail, and now the three of them were sitting on the couch in front of his parents, Narcissa in the middle.

Sirius had his arm firmly wrapped around her shoulders and she was holding him around his lower back as he tried to explain it again to mr. and mrs. Potter.

"They're torturing her, Euphemia... The fucking cruciatus curse!"

Euphemia looked at Narcissa with a pityful look, and Narcissa was secretly glad she hadn't had the time to properly heal the bruises and the small cut across her temple for she was certain it helped with the amount of pity she was given.

"Your father did that, dear?" She asked carefully in a much warmer voice than Narcissa was used t from her own mother.

She couldn't do much else than nod and was glad when Sirius' arm tightened a little. "Yes, ma'am. Usually I'll heal them properly afterwards but I didn't have much time..."

"Usually? This happens regularly?" Fleamont spoke up with disbelief and next to her Sirius looked down. "No question Euphemia, they're staying here. Look at that face..."

It was decided then it seemed, Narcissa thought. She was no longer a Black.

Narcissa and Sirius would take the guest room for tonight and tomorrow they would clean up the attic with James' help to create another bedroom. According to Euphemia it was best to wait what their family would do until they took legal actions.

Fleamont and his wife went back to bed around one in the morning but not before they had taken their time healing both Sirius and Narcissa properly and making sure the two of them would be okay for the night. Along with James the three of them then stayed up for a while longer in the guest room.

"So... You officially go by Narcissa now?"

"Yes."

Narcissa looked him straight in the eye to judge his reaction but James only gave her the same lazy grin he'd given Sirius earlier. "As long as you don't hope I'll go easier on you during the games this year."

She laughed with him and leaned back against the bedside, for a few precious moments forgotten how much had changed this evening. "Like I'd need it Potter."

"I like the hair by the way, looks good on you."

When James eventually left to his own room as well and it was just the two of them, Sirius and Narcissa changed into their pyjamas and lay down. Huddled close together for comfort as they both had tears in their eyes, now finally alone the consequences of their actions starting to sink in.

They were silent for a few seconds before Narcissa pulled her younger cousin close against her chest and whispered the realization they'd both thought of out loud.

"We're no longer Blacks, Siri."

"We should be glad for it."

oOo

I'm not sure how long the updates are going to take, but if you liked it please do let me know because it's such a great motivation!