Solving a Riddle

Blood

"So what's your blood?" Tom asked me.
I had snuck him into the Hufflepuff common room so we could study together.
"Well-er-" I had to think fast. Dumbledore told me to tell everyone I was a pureblood, but I was proud to be a Muggle Born.
Don't screw this up Lordess I thought.
"I'm a pureblood." I finally blurted out
Tom nodded.
"What about you?" I asked him.
His green eyes were full of shame.
"I'm a half blood....." he said quietly.
He looked away from me.
"That's not a bad thing!" I said, rubbing his shoulder
His head jerked to look at me.
"I am called cruel names like 'Unworthy' and 'Mistake'!" He said, whipping a tear from his eyes.
I felt my face redden with anger "what's the password to the Slytherin common room?" I asked
"Why-"
"WHATS THE PASSWORD TO THE SLYTHERIN COMMON ROOM?!?!"
"Mudblood but-"
I took of my long black cloak and sweater vest so that I was just in a white button up and wool skirt. I tied my hair up with my Hufflepuff tie.
I raced out of the common room.
"Lordess! Wait!" Tom began to run after me.
I was walking so fast my ponytail was swinging back and forth. Tom was having trouble keeping up.
"This really isn't a big deal!" He kept saying. I walked down the stairs three at a time. Tom slid down the railing and then stood in front of me.
"STOP! It's not worth it!" He yelled.
I kept trying to get pasted him but he kept moving so I could not.
"Move Tom!"
"No!"
I slid underneath his legs, and walked up to the Slytherin portrait.
"MUDBLOOD!"
It swung open and I walked inside to see Malfoy and his gang of goonies. Tom walked in and grabbed my arm, trying to pull me out. I pulled out of his grip.
"Well, well, well. If it isn't Unworthy and his girlfriend!" Malfoy smiled.
He got up and began to circle Tom and I.
"Grab Unworthy here." Two strong looking fellows grabbed Tom's arms and pinned them behind his back.
Malfoy then just circled me.
"You are quite pretty." Malfoy said. "What is your blood type?"
"She's a pure blood Malfoy!" I heard Tom yell.
"You will be mine." Malfoy purred in my ear.
I slapped Malfoy across the face.
"HOW DARE YOU CALL TOM UNWORTHY!! HE IS ONE MILLION TIMES THE MAN YOU WILL EVER BE!!!"
Malfoy tried to grab me but I moved out of the way.
I looked at the strong boys who held Tom.
"Let him go!"  I shrieked
They threw him at me. We both fell onto the floor.
"Sorry." Tom said helping me up. I grabbed him by the hand and walked out of the Slytherin room.
"Why did you tell them my blood?" I asked.
"They would have assumed you were a Mudblood."
"Don't say that Tom. What's the big deal if I was muggle born?"
Tom stopped. "He would have done unthinkable things to you."
I nodded.
We got to the Gryffindor common room "Mandrake Juice." I said the portrait opened.
We went up to my dorm. "Can I sleep here tonight?" Tom asked. "I cannot go back there."
"Of course!" I said.
We made a blanket fort under my bed. We laughed and talked until we each fell into a sweet sleep.