Derek knocked on the Stilinski's front door. He was determined to see KC. He had to talk to her. About being a Hale, about being a succubus. Stiles opened the door. He smiled at Derek. "Hi Derek." He said brightly and a little too loudly.

Derek heard a groan from the living room. "I'm going out. Have fun." KC didn't sound in the least like she wanted Stiles to have fun with Derek.

"Wait, I need to talk to KC." Derek declared.

Stiles eyed Derek suspiciously. "I'm not here." KC grumbled, and Derek could hear her moving towards the kitchen, towards the back door.

"She's not here." Stiles said, crossing his arms. They obviously didn't care that Derek could hear them.

"KC, I know what you are." Derek shouted. Kc stopped dead in her tracks, and then she was stomping to the front door. She stood behind Stiles eyes blazing. Derek was just glad they weren't the telltale succubus hot pink.

"So now you believe me?" She spat out.

"Can I come in? This isn't the kind of conversation we can have out in the open." KC scowled deeply.

"That's up to Stiles." She announced. She turned and went back to the living room. She was rapidly hitting keys on her phone.

"Are you inviting the rest of the pack?" Stiles asked, he still hadn't let Derek in.

"Just Isaac and Jackson. They already know I'm not human. I'll tell everyone else after Derek ells us what I am." KC answered.

The good news was that meant Derek could keep an eye on KC and the kanima at the same time. The bad news, Stiles didn't let Derek in until Isaac and Jackson got there ten minutes later. He was the last one allowed inside and given how much Stiles hated Jackson it spoke volumes about how much loyalty Stiles held towards his friends.

KC was perched in the armchair, her knees drawn up to her chest. She looked so small. Jackson sat on the arm of the chair and Derek didn't miss the way KC's hand rested on Jackson's back, ready to give him back control if the kanima's master took over. After all the horror stories Derek had heard growing up it boggled his mind to see a succubus and kanima working together for nothing more than their own protection. Isaac lounged on one end of the couch and Stiles lounged on the other. KC laughed.

"You guys look like the cover of a boy band album." She announced through her giggles.

"What?" Stiles asked, sounding surprised. KC continued to laugh uncontrollably and shook her head.

"Jackson go sit in the middle." KC said swiping Jackson's phone off the table. Jackson rolled his eyes, but moved to sit between Stiles and Isaac. KC aimed the camera of Jackson's phone at the three. She took a couple of pictures before turning the phone around so they could see. "See?"

Stiles shook his head. "Nope." Derek heard the lie but didn't say anything.

KC pouted. "Fine, I'll send it to Lydia. She'll back me up."

"No! Don't send it to Lydia!" Stiles shouted jumping to his feet. KC cackled and proceeded to send the picture anyway. Stiles went to stop KC, but she climbed onto the coffee table and held the phone over her head.

Derek cleared his throat loudly before the game of keep away could get out of hand. Stiles and KC both froze like deer in headlights. KC launched herself from the coffee table to the spot ton the couch between Jackson and Isaac. She handed Jackson back his phone. Stiles went back to the couch. Derek sat in the armchair facing the other four. "So, what am I?" KC asked, crossing her arms.

"A soul stealer. A succubus." KC was back on her feet in a second.

"What? No way, that's not possible." KC declared.

"You don't even know what a succubus is." Derek accused.

KC's eyes narrowed. "Succubi, female sex demons. Usually tied to the demon Lilith. They feed off souls through sex and depending on what myths you follow they're either shape-shifters or deformed. The male version of the species is called an incubus." KC listed off.

"Yes, males are called incubi and yes they used to feed off sex, but they've evolved. Different family lines feed off different things. The Crumblvhal line feeds off soulmate misery."

KC stiffened, and her hands balled into fists at her side. "Excuse me?" She demanded, hiditing hurt and fear behind anger.

"How can she feed off soulmate misery if she isn't make the soulmates she knows miserable?" Jackson asked.

"Yeah, if anything KC saved Lydia from the misery of dating Jackson." Stiles spoke up. Jackson shoved Stiles who laughed.

Derek shook his head. "KC hasn't fed." Derek didn't miss the relief that crossed KC's face. "She's only half succubus. She's probably been okay on human food until she started touching soulmarks."

KC looked sick, but she continued with the questioning. "How do you know more about me than I do?"

"My aunt is the local soul stealer expert. She married one and had a kid." Derek felt bad about not saying two kids, but KC didn't need to know about Valera right now. Derek was already turning her world upside down without bringing up her dead twin sister.

KC seemed to stop breathing altogether. "I don't want to assume anything, but are you trying to tell me I'm your cousin?" She asked, eyes wide. Derek nodded. KC shook her head. "Nope. No. I can deal with werewolves and kanimas, soulmarks, and crazy alphas trying to kill us, but I can not deal with all this." She said waving her hand around to gesture around the living room.

"Being a succubus or being Derek's cousin?" Isaac spoke up.

"Both." KC sighed. She looked so tired. She needed to feed soon, but it didn't look like she was very open to the idea. KC sucked in a breath and a bubble of laughter escaped her. "Well at least now I know what my mom meant." She didn't elaborate. With a heavy sigh she collapsed back onto the couch.

"KC." Derek said. KC looked up. "You need to feed. If you don't know how to you could wind up hurting someone." KC groaned and ran a hand through her hair.

"Alright what do I need to do?"

"Touch Stiles's soulmark."

KC stiffened. "Do I have to?" Derek nodded. KC moved to sit next to Stiles with a grimace. "Sorry about this." She muttered as she grabbed hold of his wrist. She took a steadying breath and touched her finger to Stiles's soulmark. Her eyes changed to pink before KC squeezed them tightly shut.

"Do you feel the pain?"

"What the hell do you think?" KC growled through gritted teeth. Her nails were digging into Stiles's arm.

"Open yourself up to it. You do that, and it will change." KC scowled, and Derek was pretty sure she didn't believe him. She took another steadying and let it out slowly. Her face slowly unscrunched as she converted the pain she got from the flashes into fuel. Derek had seen Valera do it when they were younger, but it was still so odd to think of KC doing it, even as he watched.

KC let go of Stiles's wrist before exiting the living room and running up the stairs. "We're not talking about this! Ever!" She shouted back down before slamming the door to her room shut.

~Credits~