Perhaps the best Christmas Eve Ever! With My Sister

Note : This story is completely fictional!

It was Christmas Eve and me and my sister had been shopping in town for some last minute presents. Once finished shopping, we went back to my car and i was going to drive back to our house.

I was happily driving along with my sister sat in the passenger seat reading The Sun newspaper. I got a glimpse of the page 3, and the fact my sister was also looking at it. I then looked at her and i could see she was slowly rubbing her self. I tried to stay focused on the road but with my hot 18 year old sister rubbing her self next to me, it was quite hard.

10 minutes later we arrived home, she had been touching her self for the whole journey and I knew she was extremely horny from it.
"Hey mum". She said as we walked through the front door.

"Hiya, I've just realised I've forgotten some things for the dinner tomorrow so I'm gonna have to pop to the shops, I could be a while." Our mum replied.

"No problem, we'll be fine."

My sister then rushed upstairs saying she had wrapping to do. I also went up to my room and began wrapping presents.
After about 5 minutes or so,I could hear a moaning sound coming from next door, my sister's room.

I took a peek through the door and I could see her with her hands down her panties rubbing her self. I continued to spy for a bit and found my self getting hard.
I then went back into my room smiling at the thought of my sister masturbating. 5 minutes later i decided to go back to see if she was still going, she was, and this time she was topless. Her t-shirt and bra were lying on the floor and she was still rubbing. This was the first time I had seen my sister's tits in the full flesh, and seeing her natural 34 DD's was really starting to get my dick hard.

She must of been incredibly horny knowing I was in the room next to her. I pulled my cock out of my jeans and started stroking it, peeking through the crack making sure not to be seen.

Then... she must of really been getting turned on, she pulled off her shorts and panties and threw them across the room. Pulling off the duvet covers as well, my hot sister was lying completely naked on her bed masturbating, and I was watching it all.

I couldn't take it anymore, I had to think of something as an excuse for me to walk in.

I went for it, " Laura have you got"

" Woah!!" I shouted interupting my own sentence, pretending this was the first I saw of this.

" Shit!" she shouted back.
I could see her pussy was so wet from all her work on it. My dick was getting so hard and I knew she could see the bulge in my trousers.
My sister grabbed her duvet and pulled it over her again.
"I'm so sorry sis, I'll go and leave you to it."
"No, don't."
"What?" I replied hesitantly.
"Have you never wondered what it would be like?" She questioned.
"What, what would be like?"
"Ya know...me and you, getting it on." She pulled the duvet down, and lied there naked touching her pussy.
"No!, You're my sister!" I exclaimed, but I was lying. I had masturbated over the scenario many times before.
"Come on Ryan, I know you want to." she whispered seductively.

She was horny, I was horny, I had to take the chance of finally getting to bang my hot sister.
I walked over to her and sat by her. I began to stroke her large tits and soon her nipples became stiff as. I could see her pussy getting wet again, and my boner increased. I touched her pussy and rubbed her clit, making her moan with pleasure.