My Sexy Stepsister

This is my first story, so please be nice...

The first time I saw my stepsister masturbate was one of the most erotic sights of my life. I had just come in from school, Liv must of had a free lesson and come back to the house and into her room. I had just come into the room to say hi but now I was transfixed, watching her every move. She was completely devoid of clothes, her 36D boobs jiggled as she thrust two fingers into herself again and again. I took a closer look at her snatch, shaven except for a thin strip of hair just above her slit. Liv was a sexy thing at 17, standing 5'6", a brunette with a curvy, ultimately stunning figure and a cute bum to die for. At 16 I was an average looking guy, short spiky blonde hair, pretty tall and slim.

My member was now as hard as a steel bar watching her ministrations. I tactfully decided to quietly slip away unnoticed and go into my room to relieve myself. I stripped naked and got my laptop out to watch some porn. I was really close when my door opened, it was Liv, clad in boyshorts and a bra.

"Umm, hey there Joe. Sorry about, you know. I was wondering if you would give me a massage, I've got an exam tomorrow. Pretty please?" She made that face, the expression that can never be turned down.

"I can if you want me to, give me a minute to put something on and I'll be in your room in a sec."

I walked over to my drawers, my now semi-hard prick leading the way. I picked out a pair of thin joggers and slipped them on, then making my way towards Livs room.

When I entered Livs room I could still smell her aroma, her juices. I perked up to a full erection, not bothering to hide it from her. Our family has a pretty relaxed approach to clothes and nudity. "The oil is over there Joe." As she pointed towards the bedstand. As I collected the massage oil I noticed Liv undo her bra and drop it on the floor. I walked over to the bed and readjusted myself so I wouldn't poke her with my boner.

"Just take them off Joe, it'll be easier."

"I'll be naked then, are you sure?"

"I'm sure, i've seen you god knows how many times and you won't need to keep adjusting yourself. Besides, I like the feeling of skin on skin."

I obliged her request and slid my joggers down and my erection sprang out. With my boner leading the way I took my place over her, sitting on the back of her thighs, my penis nestled on her peachy bum, over her cotton boyshorts.

"I can feel you, hehe!"

She squeezed my cock by tensing the muscles in her bum I gasped. To stop a certain eruption I grabbed my boner and pushed it down between her legs. The head must of been on the lips of her sex from the heat I felt, I wasn't complaining.

I took the oil in my hands and started to rub it into Liv's shoulders, as I was leaning forwards I realized I was practically humping her pussy with my naked hard prick, I hoped she didn't realise. After a while I thought I felt her get a bit wet. I purposefully thrust harder against her,

"Mhmmm."

"Is that nice Liv? Are you wet?" I asked.

"Uh huh, don't stop, I'm getting close."

Ignoring her I pulled away and turned her round so she led on her back. I got the massage oil and squirted it all over her, I then took up the missionary position, but again rubbing against her. I held her to me as I thrust against her hard and slow, making Liv's pleasure last. Her boy shorts were now soaked through but I didn't take them off, I love a girl wearing panties during sex.

I felt Liv tense up and she held me in place with her thighs as she let go, cumming on my cock, I could almost feel her contractions as she rode out her orgasm, whimpering and shaking.

To be continued...