Title: A Promise Must Be Honoured

Author: Wereleopard58

Rating: T/Teen and up audiences

Show: Teen Wolf/The Witcher (mostly the series, it is technically AU, there are changes. (There will be a little of Witcher 3 game mixed in).

Pairing: Derek/Stiles, Geralt/Jaskier, Slash,

Warning: For all of Teen Wolf and all mediums of The Witcher. I am not using the exact timeline in The Witcher, and clearly, things will change because of this crossover. I am also adding something in for the connection that Geralt and Ciri have.

Summary: As Stiles is tortured by Gerard. Derek gets a call from one sarcastic human. Ciri uses her scream to escape from the men who had captured her. The connection she had with someone from a different world is sent to the man who is her destiny. Geralt collapses. Jaskier and Yennefer are unable to wake him. Derek and Stiles end up in a world that isn't theirs, one full of magic and monsters.

A/N I have completed other stories, but I am slowly posting the chapters. I am not randomly starting a new one, lol.

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Beacon Hills

It wasn't a cellar; it was a torture chamber. Chris and Allison had to know it was down here and what it was used for. The more he learnt about the Argent's, the more he believed they should be locked away. Those thoughts soon faded away as the pain started. Stiles screamed as Gerard put the wires against his skin and turned the power on. The electricity surged through his body. Stiles didn't know how long it had been. He couldn't concentrate on anything else but what he was feeling. He had lost all control of his limbs as they continued to jerk, as the psychotic grandfather pulled the implements away. He could see Erica and Boyd struggle to escape their bonds. The more he cried out, the more they tried to free themselves to help him. As much as he hated them being here, at least he wasn't alone.

"Turn it up," Gerard smirked as he shouted the order. "We have to make sure that Scott will never betray me, not that he would anyway because he loves Allison so much. I know we had a deal, but I like to make sure that he knows what he would lose, and it would be more than just his mother." The elder Argent leaned in closer to his victim. "Now that Scott is popular, would he really care about what would happen to you. You're just a sidekick, the one that is keeping him back."

Stiles couldn't believe what he had just heard; at that moment, all the pain was forgotten, he could see the surprise in Erica's and Boyd's eyes. Scott had betrayed them all. Just then, Gerard's cell rang, he laughed at the recognition in their eyes, realising that someone they knew had betrayed them. He pulled it his cell out and glanced at the display.

"Would you like us to shock him again?" One of the hunters asked.

"Hurt him as much as you want, but make sure he is alive when he's found. I don't care how badly hurt he is. He can eventually die for all I care. Scott, Allison and Chris are waiting for me." He laughed as he headed out of the basement and back up the stairs.

"Did you hear that we can hurt you as much as we want? You're a traitor to your kind, and you sided with the monsters."

Stiles choked as he laughed. "You have three teenagers tied up and are torturing them. You don't just enjoy it, but you are getting off on it. There are monsters down here, and it definitely isn't the werewolves. Take a look in the mirror next time you call someone that," Stiles' head whipped to the side as he was slapped hard, blood trickled from his nose, and a cut on his lip made from a ring the hunter was wearing. Through everything, this was the first time they had made him bleed. The bruises he would end up with were going to be horrendous. He would survive this, and Stiles would make sure that the Argent's and their foot soldiers would pay for it. He had no idea what to do about Scott, but it felt like their friendship was over. How could he trust him after this?

The hunter laughed as he pushed up the power and turned it in on. Stiles screamed, he never stopped as his body convulsed.

Erica and Boyd glanced at each other and struggled with everything they had trying to escape. But another hunter turned on the power to stop them. They were helpless. All they could do was watch.

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Cintra

Ciri struggled as she tried to escape the man that had captured and was riding away with her. There had to be a way she could get away from him. Just then, a pain shot through her body, and she screamed. The horse reared up on his hind legs and knocked the two of them off its back. She scrambled forward away from her kidnapper when the pain hit again. "Stiles." She screamed and continued to do so as the earth made a huge gap between her and the man who had taken her. When it was clear he couldn't get to her, she stood and started to run. Ciri had to get away.

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Beacon Hills

Stiles' body went still, his eyes wide open, and he screamed. Erica and Boyd struggled to try and cover their ears. The pain was excruciating. The man in front of them just collapsed. They just managed to glance over at each other. It should have hurt them more than it did them. Just then, everything went quiet.

"Ciri," Stiles whispered and then screamed once more. This one knocked the two werewolves out and Stiles.

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Cintra

Geralt rubbed at the bridge of his nose as he listened to Yennefer and Jaskier squabble. The two seemed to argue over everything, it didn't matter what it was, and it was definitely on purpose. He never understood why Jaskier seemed to dislike her so much. Yennefer, he knew why. They had sex, but it was never anything more than that and eventually, his feelings for the bard had grown. The sorceress had somehow seen how he felt and was jealous. She had never mentioned it to Jaskier, and there was no way he was going to. So here he was, stuck between the two and their never-ending arguments.

The witcher shook his head; he could hear voices. He looked over at his companions as they continued to annoy each other. Suddenly they became screams, two separate ones overlapping each other. "Ciri, Stiles," Geralt called out before he covered his ears, trying to block out the sound, but nothing helped. The darkness began to overtake him. He could feel the quietness within. Blessed silence.

Jaskier rushed over as soon as Geralt had fallen off Roach. "Geralt?" He called out in a panic.

Yennefer joined him as soon as she climbed off her horse. "Let me see him."

Jaskier moved back slightly. She had more knowledge in this area than he did. The two of them might not get on, but they wouldn't do anything to hurt Geralt.

She pulled back and looked around. There was something weird in the air. "I know Ciri, but who is this Stiles, and why would he call for them now?"

"It's something magical, isn't it?"

"I don't know, Jaskier, I hope so. If it is, then I have some hope of figuring it out. We'd better make camp." Yennefer glanced to the side of the road. It looked like a good place. The last thing she wanted was to put Geralt on his horse and use magic to keep him there. She had no idea if that would cause more problems.

Jaskier looked over at her. Yennefer had to help him. He couldn't lose Geralt. He had only recently realised that he had fallen in love with the witcher. "Please help him."

"I will." She stared at the other man a little longer. The bard loved Geralt. She truly hadn't though it was serious. Her ego was hurt, not her heart. Yennefer shook her head; the two of them were idiots. This could be the thing that brought them together. He had to make it, he would make it, and she would make sure.

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Beacon Hills

Stiles groaned as he woke up. His head was pounding, and his body had never hurt so much. He promised to never complain about the workouts coach gave them. As soon as his eyes landed on Erica and Boyd, he climbed to his feet. It was extremely slow and painful. He could barely move.

As soon as he checked their pulses, he breathed a sigh of relief. They were both alive, and it sounded strong. Stiles reached up and released their bonds. They fell to the ground hard, but they didn't wake up. What the hell was going on? He hobbled over to the two hunters and checked to see if they were alive. They were, unfortunately. He couldn't do much now and needed help. There was no way he was going to contact Scott, that traitor. There was only one person he could. Stiles reached the table that had his cell on it, turned it on and then dialled.

"Derek, I need your help," Stiles muttered as soon as the grumpy werewolf answered. "I'm at the Argents. They have Boyd and Erica. Whatever you do, don't talk to Scott. I'll explain everything when I see you." He looked around and needed to make sure it wasn't a trap. "I'll be back soon." He whispered to his friends and made his way to the stairs.

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Derek stopped and got out of his car, a little way away from the Argent's house. He didn't trust them and never would. But what was Scott up to? Why didn't Stiles trust him? He was missing something. Just then, he spotted the sarcastic smartass that he couldn't seem to stay away from. He looked hurt and badly by the way he was walking and holding himself. Derek rushed to his side and reached out, holding his wrist and taking away the pain.

Stiles sighed in relief. "Oh, thank you. I needed that."

"What's going on?"

"Well–." Just then, a portal opened and dragged them both through.

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Cintra

"Are you sure about this?" Jaskier asked again.

"No, I'm not sure, but there is something magical around him. I used that, and it created this portal. We need to know what is going on." She knew the other man was worried, but if he asked again she was going to hurt him.

Before the bard could answer, two people fell through the portal wearing bizarre clothes.

"Who are you? What did you do to Geralt?" Yennefer demanded.

Stiles looked around. "Where the hell are we? Who is Geralt? Who are you?" He snapped.

Derek rubbed his forehead. "Stiles."

"Wait, your Stiles?" Jaskier stared at the two strangers intently.

"Yes, why?"

"You need to help him?" Jaskier pointed to the unconscious man who lay next to a fire.

"How can I help him? I don't even know who it is?"

Yennefer coolly stared at him. "His name is Geralt, and he's a witcher."

Stiles looked over at Derek, who shrugged his shoulders and then back over at the woman. "A what now?"

TBC