Disclaimer: I do not own LWD or SPN. I do not own 'Stitches' by Shawn Mendes either.

A/N This is chapter one. I hope you like it and please review! Thanks loves- Elliana xx

"I'm trippin' over myself, I'm aching, begging you to come help..." Casey sang along as she danced in her room. "And now that, I'm without your kisses, I'll be needing stitches!"

It was late and the rest of the Venturi-McDonald clan had already gone to their respective bedrooms after dinner. Casey had just finished her homework and decided to let loose by dancing. Of course, Derek wouldn't allow her to have even a second of peace!

"Turn that crap down Casey!" His voice rang out through the wall, the only thing separating the two stubborn teens.

She paused before frowning. "No way in hell, Venturi." Casey walked out of her bedroom, and knocked on Derek's door, before walking in.

Derek looked up from his computer and scowled. "Erm, I'm sorry, but who said you could come into my room?"

"What? So I need permission to walk in our house?"

"Yes." Derek looked at her like 'well duh'. "My house, my rules."

"Our house De-rek. We live together now. I have the right to do as I please and the freedom to walk wherever I want. In case, you didn't know that right doesn't only imply to you."

"Sorry, Princess. But no, you don't." Her smiled at her and pushed her out of his room. He popped his head out again. "And yeah, that 'right' does only imply to me!" And with that, he slammed the door in her face.

Casey huffed. 'He is so freaking annoying!' She walked back into her room and collected her things for school tomorrow.

'Sleep is better than arguing with him, ergh!'

"Stupid Derek." Muttering under her breath, she got under her covers and switched off her lamp. Settling down, she fell asleep as soon as her head hit the pillow. Guess she didn't know she was that tired.

On the other side of the wall, Derek was surfing the net, boredom all over his face. He groaned and switched off his computer. He spun around in his chair, throwing a ball up in the air and catching it. He did this for a while, before he threw it at the wall in frustration. Nothing happened. He cocked an eyebrow and waited for the shrill cry of 'De-rek!' that made him laugh. Silence filled the room.

'Hm, still nothing. What, did she die in there or something?' Derek got up and made his way to Casey's room. It wasn't that he was worried, no, he just had nothing better to do, so he decided to go annoy his step-sister. Maybe even get her to help him with his homework- unknowingly of course. It helped to have a keener step-sister in the house. He lifted his hand and knocked on her door. "Knock, knock." No reply. Derek turned the knob slowly and poked his head inside, "Hey Space Case-" He paused when his wondering eyes fell on Casey, sound asleep in her bed. He sighed and found himself smiling softly instead, 'Cute.' When he realised what he'd done, he frowned and hurried back to his room. 'Cute? Where did that come from?'

"What is wrong with me? Did I just- Noo. I'm just tired, that's all." Derek muttered, trying to reassure himself at what he had done.

Shaking his head, he laid down onto his bed and switched off his lamp. He nodded to himself in the dark. "Okay, Derek. You're just tired." He smiled. "I mean, I don't even like Casey- nahh. She's so annoying. I do not like Casey, I do not like Casey," His eyes slowly closed and he repeated the mantra in his head, before drifting off to sleep.

'I do not like Casey... like Casey.'