Author's Note: I would like to thank the Fangirl who keeps commenting on this story for placing this idea in my brain. I hope it's everything you wanted, it may end up with a few parts. I own nothing.

Childlike Behavior: Peter

Stiles grunted as a blast of power slammed into the shield she'd just had time to throw up around the pack. She really wished Derek was better at talking to people, if he was maybe this wouldn't have happened. Maybe the witch they were supposed to be making peace with wouldn't be trying to kill them.

"The hell did you even say to her Sourwolf!?" Stiles shouted across the field. Derek rolled his eyes leaping over the bright purple shield Stiles had cast around them and roaring. He honestly didn't want to talk about how they'd been on the brink of a peace agreement when the witch had propositioned him and he'd turned her down hard. He had someone else he wanted to move forwards with. Well he wanted to, that didn't mean he would do more than watch from the sidelines as she protected his pack and his wolf howled at him to take her and make her his. He dove to the side barely dodging a fire blast. He heard Stiles swear and her shield flickered. He glanced over his shoulder and stepped to the side so he was in front of her, between her and the danger. The witch tilted her head at them then smiled as Stiles sunk her hand into the dirt of the preserve and her shield stabilized and roots began to grow up around the witch's ankles. Then she laughed.

"Children's tricks from an untrained Fae. Cute." The roots burned and Stiles screamed pulling her hand out of the earth, her shield falling completely, her fingers burned. Derek roared and lunged. But the witch vanished and reappeared behind him directly in front of Stiles who gasped and stumbled back. But the witch was much faster than she was and caught her by the front of her red hoodie. The pack howled and circled unsure if they could do anything without hurting Stiles. The witch's eyes flashed bright orange and for an instant brilliant white lines appeared from Stiles, each of them seeming to connect to a member of the Pack. Derek felt his heart seize as the witch fingered one of the bright lines of light as the others vanished. This one was swirled with gold and seemed to connect to him. Stiles' heartbeat had stuttered at the same time as his as the witch grinned and released the line but not Stiles.

"Oh so that's why you turned me down." She pressed a finger to Stiles' forehead and Stiles shook from head to toe as bright orange light wrapped around her head. Derek's growl shook the ground. The witch frowned as she turned her face to Derek.

"She doesn't know, what she is to you. You haven't told her!" The look on her face told him that she knew that he hadn't told Stiles she was his Mate, his always, his everything. She frowned deeper. "She thinks she's nothing to you. Did you know that? Just another tool to use for the packs benefit." Then the witch smiled.

"I know just how to prove her wrong." Then she began to chant and Stiles froze as orange smoke rose around her. Derek's heart stood still as he heard Stiles let out a breathy scream. He lunged but his hands were met with empty air as the witch's laugh filled the clearing.

"When you can prove you treasure what you've lost the spell will break." Wind swirled through the clearing and all the wolves coughed and swatted at the orange smoke that billowed around them. It took a few minutes for it to clear which gave Scott time to stumble over to the last place he'd seen his best friend. He couldn't see her or Derek. He coughed as the smoke finally began to clear. Then he spotted Derek kneeling down next to a bundle of clothes. His heart nearly stopped. Had the witch vaporized Stiles? He was going to hunt her down to the ends of the earth if that was what had happened.

But Derek was holding a tiny figure in Stiles' red hoodie. She couldn't be more than three years old. She seemed to be fighting him too. He let her down, not wanting to hurt her and Scott got a good look at her for the first time. She had shoulder length curly brown hair and freckles scattered on her cheeks along with a few moles. Her big whiskey colored eyes were brimming with tears and she smelled confused. But he knew her. She looked just like she had when he'd first met her on the playground after she pushed Jackson down for teasing the new kid, which at the time had been him. He stared for a minute before stammering her name out loud.

"Stiles?" She looked up at him confused and ran straight into his legs, holding onto them like they were the only familiar thing in the world. He gently knelt down and picked her up. She was still in the Star Wars t-shirt she'd been wearing all day that day but it was many times too big for her now and the hoodie was practically falling off of her as she wrapped her tiny arms around his neck and muttered his name. She clearly recognized him, but not Derek. She shivered and he held her a bit closer as the pack circled in looking confused. Peter raised an eyebrow.

"Well this just got interesting." Stiles glanced up at him and stared him down for a minute. It was almost unnerving but then she giggled and detached herself from Scott's neck. She squirmed until he set her on her feet and she tottered over to Peter. She stared at him for another minute before she giggled again and placed her hands in front of her mouth like they were fangs. Peter just about laughed. He remembered her doing that a lot when she was younger over at the old Hale house. She had been incensed that even Cora, who was a year or so younger than her, could have fangs and she couldn't. So that had been her solution.

"Peter!" She reached her hands out to him and made a grabbing motion and Peter caved, scooping the tiny girl off her feet. Every other member of the pack tensed and Stiles looked at them like they were all crazy. Scott carefully stepped over to the pair aware what Peter could do to someone as tiny and defenceless as Stiles was right now.

"Stiles… what are you doing?" Stiles looked at him like the answer to his question was obvious.

"I know him! His sister is friends with my mom! He's Peter, he's a little weird but he's ok." She gestured Scott closer and whispered loudly in his ear, clearly unaware that everyone here could hear her clearly.

"He's a werewolf, but don't tell anybody. It's a secret!" She giggled and Peter couldn't help the smile that pulled at his mouth. Derek stepped closer and Stiles shrieked and buried her head in Peter's shoulder. Peter outright laughed at the expression on Derek's face. A mix of betrayal and a soft kind of anger, the kind not really directed at the child in his arms.

"How come she remembers you two but not me?" He sounded like he was about to start pouting. Peter shrugged.

"No idea but we should probably get her to Deaton, see if there's been any lasting damage done. And if he can help us figure out how to break the spell." He turned to the tiny child in his arms and spoke carefully. "What do you think Stiles, do you think we should go in the Jeep or the Camero?" Stiles glanced up at him and thought for a minute.

"Jeep. I like jeeps. I wanna drive a jeep when I'm older. But it's got to be blue." Peter nodded along with the small girl's babble as Scott fished her keys out of the jeans she'd been wearing. He held them out to Peter who shook his head.

"You drive. I've got her." Scott felt a little better knowing that he would be within inches of the now three year old girl who was like his sister. He gathered her fallen clothes and followed Peter out of the clearing. The other wolves milled for a moment before Erica caught Derek by the arm.

"We're gonna fix this. Stop pouting, it's weird." They heard a shrill shriek from back where they'd parked their cars and raced off. They expected to find Scott dead with Peter standing with a tiny corpse in his arms but they found Stiles nearly bouncing out of Peter's arms. She had spotted the jeep.

"It's perfect! Who's is it?" She asked bouncing in Peter's arms. He smiled as Scott stepped up to his shoulder.

"Yours when you're old enough!" There were stars in her eyes as she looked at Scott.

"Really!" Scott nodded. They loaded up into the cars, Erica and Boyd slipping into the backseat of the Jeep, Peter holding Stiles in the passenger seat while Scott drove. It only took a few minutes for Stiles to nod off in Peter's arms. Erica stared at him.

"You seem good with kids." Peter nodded at his nephew's beta.

"Well yes. I had two of my own, once upon a time." He looked down at Stiles, a little sad this time. Erica leaned back in her seat watching the wolf in the front seat hum a song to the sleeping child in his arms.