Corrupted Hearts ? Isaac Lahey x Reader

(Edited ~Properly~)

We were in the library and I was picking out a book. I needed to read about something to do a report in it, and as much as I would like to ingore it and not do it, that would cause problems which weren't needed.

The boys stood nearby pretending to be looking at books too but were actually checking people out, people as in Aiden's looking at Lydia, as the plan suggests, and Ethan's looking at Danny but his gaze seems a little more than work. I chuckled deciding to listen into what Lydia was saying, 

"I want one," She said dazed, 

"Which one?" Her friend asked, 

Lydia deadpanned, "The straight one obviously" 

Finding my book I walked over to the boys and wrapped an arm around Aiden. "Ok I'm ready" I told them and listened into the girls' conversation again, 

"Who's that?" the dark haired one asked about me. 

"Their sister, foster sister. Every boy is after her she's like some boy magnet, well her and Ethan" The strawberry blonde girl answered chuckling at the last part.

I chuckled as well, the twins giving me a puzzled look which I shrugged off, before walking out of the library, leaving the twins with their 'crushes'.

~Time Skip~

I was pacing back and forth with the twins standing there arms crossed next to me, we were waiting outside for the rest of the pack and Morrel. 

"Why am I doing this? Why am I following them? They already killed Erica?" I keep thinking out loud regretting my decision to even trust Deucalion in the frist place. "I thought Derek was dead. Now, he's going to save Boyd and oh god..." I stopped pacing finally understanding what was going on. "You knew didn't you?" I turned to Ethan and Aiden. "You knew that Deucalion was doing this, I thought- I-- how could I be so naive!" I pointed at them before shouting at myself, throwing my hands up in frustration.

"We're sorry, it was part of the plan" Aiden spoke first but it seemed slightly forced.  

"He made us" Ethan apologised. 

I looked down before running back into the building only to have Kali throw me into a wall. I groaned as I slide down, a bruise already forming on the back of my head. I looked up at her and Ennis, "The hell!" I shouted standing up.

"Go after them, try to stop them then you're no longer part of our pack" Kali spat as she looked down on me, she was always so melodramatic and I was getting slightly fed up of it. 

I growled, my eyes glowing a deep red and my claws showing "I never wanted to be" I replied before running at her and pushing her aside, then heading to the vault, Ennis doing nothing and Kali let me go. 

I rounded the corner of the large room and came face to face with Morrel, standing outside an open door to the grande vault. She finished dropping the mountain ash along the vault door frame.

Deucalion stood next to her, his face neutal and I growled causing Morrel to look my way but the Demon Alpha didn't seem to be phased. "Come now Y/n you knew this would happen," He said in a calm but authority filled voice. 

"This isn't what I agreed to" I replied in a fighting stance. 

"Oh, but it was, young alpha, it was" There was a darkness to his voice as he was lead away by Morrel, back the way I came from and towards the pack.

I didn't hesitate to run up to the barrier, looking into the vault through and still settling smoke, to see them fighting. 

~Third Person~