Through thick and thin (Katelyn Hollow X Severus Snape) (HP fanfic)

Chapter 2 Katelyn's POV

I woke up and saw slytherin robes beside me. I used a simple spell and I was now wearing the robes and my other clothes were folded nicely in the spot that the robes were before. I stood up and grabbed some of the things that had been set beside the couch for me. I walked down to the dungeons and placed my stuff in my room. I made my way to the Great Hall where Albus was waiting for me. We walked in and everyone went silent. We walked to the stage and then Dumbledore spoke.
"This is Katelyn Hollow", he said, "she is a new transfer student."
"What house is she in", a kid shouted.
"Slytherin", he said. Then I had a strange feeling. Like someone was watching me. I got off the stage slowly and searched for the person whose eyes were locked on me. Then my gaze fell on a professor with black hair and all black clothes. He was the one staring at me. I stuck my tongue out at him and walked out of the Great Hall. Then it was time for classes. I had potions first. Finally something interesting. I headed to potions and saw that dreaded professor that was watching me in the Great Hall. I rolled my eyes and sat down at an empty seat with the griffindoors. Then a boy turned and looked at me.
"Hi I am Harry", he said. Then he noticed I was a slytherin and he shut his mouth.
"Hi I am Katelyn", I said to him, "you can talk to me I am not like the other Slytherins."
"Oh", he said. Then class started. Then in the middle of class as Professor Snape was walking around the classroom he stood behind me as I made the potion.
"You don't have to stand over me", I said with a smirk. I hadn't looked up from my cauldron but yet I knew he was there.
"It makes me uncomfortable", I said.
"That is the point to make sure my students can work under pressure", he snarled in my ear. His silky voice sent shivers down my spine. I was no longer smirking but Snape was. Then the cauldron that Harry had exploded. Then I shrunk and so did Severus.
"Ugh", I muttered.
"Detention for you Mr.Potter", Severus yelled. Then the whole class erupted in laughter. Then Harry's hand came down on the chair and caused me to fall over the edge of the chair by accident. I landed on top of something. I stood up and realized it was Snape. I jumped off him immediately. He glared at me. Then the students started to scatter. Class was over. Then there was a low growl. I ran and hid behind the chair leg. Professor Snape joined me. I peered around the corner to be face to face with a cat. I froze and held my breath. My face started to turn a blue ish color. I couldn't hold my breath forever. I would either breath or pass out in a few minutes from holding my breath. I started to lose my vision then I started to lose my balance. I inched my way around and out of the cats view. I breathed for a minute until a paw batted and hit my head into the chair knocking me unconscious.