Stiles was sleeping. Derek and Scott were out, trying to track the demon with Dean and Cas. Sam and Gabe went to go get their things from their house back in Tennessee. The pack was in their respective homes, but Stiles was alone, in the new Hale house in his and Derek's room.
He was tossing and turning in his sleep, thinking about his days of torture from Gerard, and his possession. The angelic wars flashed in his mind, and it seemed as all three nightmares were forming into one. He couldn't breathe because he was suffocating in his own fears. He couldn't wake up, because the nightmares captured him, chained him down and beat him. He couldn't get free of his own mind.
Stiles was now 6 months into his pregnancy, and he was very sensitive...but he didn't smell the thick waft of sulfur in the breeze, coming from his open window.
"Now, now. If it isn't Stiles, Derek's pregnant mate." Kate whispered, humming delightfully to herself. She climbed in through the window, black smoke pooling around her feet. She was in her own body, no longer in her true form. She carefully walked towards Stiles, and ran her fingers gently down his face.
"He's beautiful Derek, but he would be so much prettier with me." She said to no one, staring down at Stiles' sleeping form. He twitched and rolled around, crying in his sleep.
"Aww, he's having a nightmare. Let's fix that." She hissed and plunged her hand inside of his chest, right where his heart should be. Stiles woke up with a scream, his heart beating fast from the pain, but Kate muffled it with the covers, shoving them in his mouth. Stiles stared at her with wide eyes, back arching in pain, and she laughed at him.
"Hey Stiles...you miss me?" she asked him sweetly, smiling with fake innocence. She placed her hand on top of his heart, healing the wounds. Stiles glared at her, trying to pry her hand off of him, making her push own hard. He felt his collar bone break from the pressure and he gasped in pain, loosening his grip. She smiled at him and placed her hand in his hair, yanking his head back.
"Tsk tsk tsk. Stiles, don't try and fight me." She scolded lightly, running her fingers through his hair. Her legs started to crack and break, turning into black smoke. Her entire body started to crack and beak off, piece by piece until she was engulfed by black smoke.
Stiles stared at the mass with fear as it floated away and plunged itself at him. He was about to scream, but the mass loved itself into his mouth, muffling it entirely. Stiles' head lolled back, and his body started to levitate above the bed and shake violently. Once she was entirely in Stiles, he dropped back on the bed.
"Now that wasn't so hard, was it?" Kate's voice echoed in Stiles' head. Stiles clamped his hands over his ears, trying to block her out.
"Fuck off." He spat to the empty room, looking around. She wasn't there, and the lingering smell of sulfur wasn't there either. She laughed at him and the pain in his head got bigger.
"Oh Stiles, that's no way to treat a guest." She hissed in his head. He could feel her moving inside if him, triggering the memories that he wanted to ignore.
"You're not welcome here. This is my head, get out!" He yelled, slamming his fist into the side if his head. He closed his eyes and put up some of his mental walls, blocking her from his memories. She screamed so loud his ears started to ring.
"I don't think so." She yelled, slamming against the walls. She couldn't get into his head anymore, which meant she couldn't control him. Stiles smiled at himself, feeling her anger. He tried to force her out, but she stood her ground. Kate snickered, which made Stiles confused.
"You're not the only mind in here Stiles." She laughed haughtily, slamming the walls, just to cause him pain. His headache started to get worse, and he couldn't focus as clearly.
Not the only mind? Stiles thought to himself. What is she...oh no...the baby!
Stiles thought, screaming at her. He couldn't stop her quick enough. He felt her prescence move from his mind, down to his stomach. He cried in agony as the baby kicked him hard, trying to fight her off. The baby suddenly stilled, but his stomach now felt empty, even if he was still in there.
"He was quite the fighter." he heard out loud, the voice coming from his stomach. Stiles shook his head, watching in horror as a demonic face popped out and started to move around his abdomen.
"It's a shame, really. I just wanted you. We could have had so much fun together." Kate said calmly. He watched as she talked though his stomach, and Stiles swore he felt the baby shrug, just as Kate would have done.
"Fun? It would have been torture." Stiles whispered at his stomach, starting to cry. His baby was possessed by Kate Argent, the woman who killed his mates family. The woman who tried to kill him. He watched as the face laughed at him and receded into his stomach.
"Oh Stiles. You would know, wouldn't you?" She taunted as she kicked him in the ribs. Stiles cried out, flopping back on his bed.
"I saw the memories." She whispered, kicking him on the other side.
"You could have prevented this Stiles!" She screamed, kicking him in his spine, making him wail.
"You did this to your baby!" She hissed at him, kicking one of his internal organs. Stiles wailed louder, using his angelic voice without even knowing it. The walls shook, and the glass from the windows and the mirrors broke, shattering into a million pieces onto the floor.
He slammed his hands on the bed and watched as huge glowing white crosses went onto every wall, covering the room from ceiling to floor. The lights started to flicker and his wings arched in pain.
Kate laughed at him, and it echoed all through the room, bouncing on the walls.
Stiles heard the door crash open, but there was a cross covering it. He looked over and saw Derek on the other side, trying to get through. He turned his head the other way and saw some of the pack whining and trying to get through the window, but they couldn't pass through. The rest of the pack was with Derek, who was trying to scream his name, but stiles couldn't hear him through Kate's laughter.
Stiles watched through bleary eyes as his Pop, Cas pushed Derek out of the way and walked through the door. Since Cas was an angel, he could walk through the holy barrier that Stiles created.
"Stiles, can you hear me?" Cas said gently to his son, who nodded weakly in response.
"Please, make her stop. I can't get her out...I can't get her out..." Stiles repeated like a broken record, crying and screaming whenever Kate would use the baby to kick him. Cas grabbed his sons face, wiping away his tears.
"It's okay Stiles. You're going to be okay..." Stiles heard his dad say quietly as Cas used his powers to knock him out.
.....
Stiles fell limply onto the bed. The crossed faded out and flickered into nothing, making the barrier disappear. Derek immidiately rushed to Stiles' side, picking him up gently and sitting on the bed, putting Stiles' back to his chest. Derek watched as his mates breathing regulated itself to match with his.
"What happened?" Derek asked, looking up at Cas. Cas looked back at him with a fierce gaze, and watched at Derek cried, clutching his Stiles to his chest.
"I'm not entirely sure. When I walked through the barrier, I heard a woman's laughter. But I didn't smell any sulfur or feel a demons prescence." Cas explained, looking at his son. He turned to the pack and looked at them with curious eyes.
"What did he tell you? I saw his lips moving but I couldn't hear what e was saying." Scott blabbered, barely coherent. Cas understood him, and answered his question.
"He kept saying 'I can't get her out...I can't get her out...'." Cas said quietly, feeling Dean and the pack huddle closer. They created a puppy pile on Derek and Stiles' bed, needing to be close to Stiles to comfort him. They all fell asleep, crying, waiting for Stiles to wake up.
.....
Stiles woke up at 5 in the morning, shooting up from bed. He tried to move his legs, but found them covered in a werewolf blanket.
"Derek!" Stiles hissed, smacking him in the nose. Derek woke up, startled for a second, gripping Stiles tighter before relaxing.
"Stiles! Are you okay?!" Derek exclaimed loudly, waking everybody up. The pack gathered around him, asking him various questions.
"Yes, I'm fine! But I really need to pee and I need help getting up." Stiles said, shuffling to the edge of the bed. Allison got up quickly, helping him off and walking him to the bathroom on the other side of the room.
"Thank you Allison." Stiles breathed out in relief, sitting down on the toilet and peeing. She smiled sweetly at him and walked out of the bathroom. Derek walked in a few minutes later and looked at Stiles with worried eyes.
"What is it Der?" Stiles sighed, washing his hands. Derek walked up to his mate and hugged him from behind, kissing his neck.
"I was so worried..." Derek mumbled to Stiles, who furrowed his eyed in confusion. He turned around in Derek's arms, coming face to face with the man he loves.
"Why? What happened?" Stiles asked him, grabbing Derek's face. Derek pulled back slightly and looked him in the eyes.
"You don't remeber?" Derek asked, looking at his mate incredulously. Stiles shook his head, and Derek couldnt detect a lie in his heart.
"What happened? Did I have another nightmare?" Stiles whispered, tucking his head under Derek's chin. Derek nodded slowly, confusion written across his face, but Stiles couldn't see it. Derek kissed his mate lightly on the forehead.
"Come on Stiles, let's get you back to bed." Derek murmuted, rubbing Stiles' back soothigly. Stiles nodded tiredly and allowed Derek to pick him up bridal style and carry him back to bed.
.....
Once Stiles was under the covers, fast asleep, the pack started talking in hushed tones.
"So, what happened?" Scott asked Derek once he knew Stiles was asleep.
"I don't know." Derek said quietly and shrugged at Scott. Scott looked at him angrily and started growling.
"What do you mean you don't know? He didn't tell you?" Scott whined in concern. Derek shook his head and looked at Cas.
"It's not that he didn't tell me...its that he doesnt remember what happened." Derek said to everyone, who stared at Derek in shock. They all averted their gaze to his human mate, who was pregnant with the heir of the Hale pack.
"He woke up the whole town. How could he not remember what happened?" Jackson hissed at Derek out of fear. Derek growled at him, but stopped when Stiles started to move.
"The baby...the baby..." Stiles whispered, clutching his stomach, crying quietly. Derek whined low in his throat, snuggling up to Stiles.
"When he talks in his sleep, when you can understand what he's saying, you can ask him questions and he'll answer them." Dean whispered, looking at Derek, who nodded in response.
"What's wrong with our cub, baby?" Derek asked Stiles loud enough so everyone could hear him.
"Kate has the baby...I can't get her out...I can't get her out...I can't get her out...I can't ge..." Stiles whispered, pained. The words started to fade out and he snuggled closer to Derek subconsciously. Derek looked at Cas with wide, pleading eyes, but Cas just shook his head.
"What does that mean?" Isaac asked them, looking like a scared puppy. Cas shook his head at the beta.
"It means Stiles was strong enough to keep Kate out of his own head, but in return Kate has possessed the baby." Cas explained with a sigh.
"Why can't you just exorcise the baby?" Erica asked Cas.
"Because most of possession victims don't survive the exorcism." Dean answered for his husband, looking defeated.
"So what do we do?" Derek whispered at Dean, tears running down his face.
"Pray."