Third person POV-

Y/n, Scott's little sister has finally gotten involved properly with the supernatural world. She knew of it as she helped out Scott when he first was bitten, often helping Stiles figure things out as she's incredibly smart and finally her cousin from Australia, Josephine, is an elemental. Although, Scott would never get her involved with the physical fighting side of things. That is, until Y/n was attacked viciously. Y/n was attacked by several oni one night where she was home alone while the pack - including Scott, Stiles, Liam, Isaac, Derek, Lydia, Malia, Allison - was hunting the oni. Scott and Stiles locked the door and promised she would be safe. She wasn't. The oni had discovered she is Scott's little sister and has connections to the McCall pack so they attacked her severely. Y/n was dying, and fast. Scott and Stiles rushed in, Scott sensing Y/n's pain and anguish. They found her lying in a pool of her own blood with one standing all around her. Back at Derek's loft where the rest of the pack were, Lydia screamed a banshee scream.

"Y/n." She breathed heavily.

Lydia and Allison are Y/n's best friend's. They rush to the McCall house with Derek and Liam as back up.

"It's open!" Scott yells through sobs at the sight of his little sister.

Lydia, Allison, Derek and Liam rushed in. Liam was distraught, he still cared for his ex. Lydia was devastated, with Stiles for support. Allison was also devastated, with Scott for support. Derek was upset too.

"Baby sis? I'm going to have to pull this out okay?" Scott says in hysterics.

There is an axe plunged in between Y/n's breast's amongst other injuries.

"On three." Stiles says, crying.

"Three." Derek says quietly.

An ear-piercing scream deafened them all. Y/n's gorgeous y/e/c eye's kept fluttering. A few tears slipped from Derek's eye's.

"Sourwolf cry-crying now eh?" Y/n joked softly through immense pain.

Everyone smiled.

"Still joking even now. I'm proud of you our little sister." Stiles says referring to him and Scott.

"Right, we need to get her to Deaton's. We'll go in the Jeep. Liam and Derek it'll need the three of us to take her pain as it's so strong. Stiles you drive. Alli can you ring mum please? After that you and Lydia get a lift to Deaton's with Isaac." Scott commands quickly.

They carefully haul Y/n onto Scott's, Derek's and Liam's knee in the back of the Jeep. Liam holds Y/n's head and takes some pain. Scott holds onto both of Y/n's legs. Derek apologises quietly and puts his hand's in between her breast's.

Needless to say, she survived, only because Scott was forced to give her the werewolf bite. It's been two months since Y/n became a werewolf and Scott has decided and finally allowed Y/n to learn how to fight properly. That's what she is doing at Derek's loft today.

Y/n's POV-

After hours of training and fighting with Derek, I'm tired but I'm still going. I try to punch Derek's face but it's feeble because I'm so exhausted. He catches my wrist and smirks. I try again feebly but this time with a slap, he catches my wrist again, smirking again.

"Is somebody tired?" Derek teases with a fake pout and with puppy dog eye's.

"Yes now fuck off." I pant.

"Don't swear at me young lady." Derek says moving closer, biting his lip.

Which is heavenly by the way.

Can you tell I've had a crush on top for about three year's?

"Why not?" I challenge, flashing my eye's yellow.

"We don't like naughty girls in this house. I guess I'll have to punish you." Derek says smirking, coming closer.

Me and Derek has had this flirty kind of banter for about a year now, much to Scott's disgust. He just threatens Derek and mutters about it to Allison. Me, Alli both find it hilarious. Derek takes it seriously and scolds Scott.

"What kind if punishment?" I ask, a bit confused of where this is going.

"This." He whispers in my ear.

He then kisses me slowly and softly, moaning into the kiss. I wrap my arm's around his neck as he wraps his muscly arm's around my waist.

"D-don't st-stop." I plead.

"I... Won't... Jump."

And I do. He catches me and holds onto my upper thighs. The kiss deepens. I hear Scott walk in the front door and mutter to Stiles about the smell of arousal in here. Derek can obviously hear to as he's a werewolf like me and has the same supersonic hearing I have.

"Y/n!" Scott shouts incredulously.

I jump off Derek and he licks his lips. Stiles tries to charge at him but Scott holds him back but steps forward too.

"I thought you were supposed to be training?!" Stiles says sarcastically.

"We were." I reply simply.

"Show us." Scott says angrily, crossed arm's and red eye's.

So I floor Stiles.

"That was quick Y/n but to maximise it more you need to work on your form." Derek smiles victoriously.

"See." I say.

"So you like our sister then?" Scott asks.

I blush.

"Yes, I have for a year and a half now. Scott I know you and Stiles probably don't approve as it's me and I sorta have a sketchy past but you know I can and will protect her with my life." Derek declares seriously.

I blush and Derek smiles a genuine one at me. Scott and Stiles - Stiles practically being my older brother too - go in a huddle whispering.

"We approve." Scott says calmer, smiling.

Stiles gives me a discreet wink as he has known about my three year crush on Derek. Stiles then tells Scott this and he seems a bit happier.

"BOOYAH." I shout in celebration after I say yes to being Derek's girlfriend.

"If you hurt her you die." Scott says seriously.

"True." Stiles says.

Derek laughs and kisses me softly again.