Sex with my little sister

Seeing all the girls at my friend's birthday party in fancy dress really turn me on. Afterwards, when my sister came into my bedroom, I couldn't resist.

My little sister and I had just been to a friend's birthday party. It was fancy, I was wearing a Spiderman costume and my sister wore a Disney princess outfit, she looked so pretty in her glittery dress and tiara.

We had lots of fun at the party. There was dancing, loads of food, and party games, and everyone was dressed up, apart from the parents. I am 12 and I have hit puberty pretty hard. Seeing all the girls running around, dancing and laughing in their outfits put my hormones into overdrive and I spent a lot of time trying to conceal the fact that I had a boner.

When the party was over and we got home, I quickly ran upstairs to my bedroom, pulled off my outfit and got underneath my bed sheets and started to jerk on my cock. It was such a relief to finally be able to pleasure myself.

I was nearly there, about to shoot off, when my sister came into my bedroom, "Do you want some cake?" she shouted as she ran over to my bed holding a napkin with a slice of cake on it. I was a bit embarrassed because she was standing right next to me while I had a firm grip around my cock.

"You eat it." I replied, hoping she would go away.

But she didn't. She sat on my bed and ate it. As I lay there motionless, I watched her eat the cake and my eyes drifted up and down her body. She had long blonde hair, still wearing her outfit. I looked at her bare arms and legs and it made my cock throb. I slowly resumed my tugging, trying not to move too much in the hope she wouldn't notice.

She turned around, my efforts to conceal what I was doing had failed. "What are you doing?" she asked.

"Nothing." I replied.

"Have you got an itch?" she asked.

"Huh?!" I replied.

Then she noticed my costume was on the floor, "Why have you taken your costume off? Are you going to sleep?" she asked.

That sounded like a good excuse to me, "Yeah – I'm tired." I replied.

Then she stunned me by standing up, she put what was left of the cake on my beside the table and pulled up the side of the bedsheet, "No, what are you doing?!!!" I asked, and she climbed under the sheets with me. I panicked and shuffled back towards the wall, covering my crotch with my hands, "You need to get out." I said.

"Why? – I'm tired too." She replied.

And then I saw her turning on to her side to face me and she put her arm around me wanting a hug, she put her head on my shoulder and closed her eyes like she was going to sleep, her leg brushed up against mine and it made my entire body quiver with arousal, my cock throbbed again and got a bit harder.

I moved my hands off my crotch, my cock sprung out and rubbed against the warm skin of her legs. She didn't react, I started to lightly move my hips around and moved the tip of my cock across her leg, it felt good.

She giggled, "Stop tickling me." She said, then she reached down and grabbed it before I could stop her, "What's that?" she asked, sticking her head under the sheet to see what it was. I pulled the sheet up to completely cover us both, even our heads, she let go of my cock and then looked at me with her mouth wide open in surprise, "Is that your thingy?" she asked.

"Yeah." I replied.

She blushed and giggled again, "Why is it sticking out?" she asked.

I didn't know what to say, I just said the first thing that popped into my head, "It's sore – I need to rub it better." I said and I started to rub it.

Then I figured she was already here, she'd seen it, she'd already touched it, "Do you want to rub it?" I asked her.

"K." she replied, then just reached back down and started to rub it. Her tiny fingers curled around my twitching cock and she rubbed it so gently, she looked up and we both smiled. I got lost in the moment and I kissed her on the lips.

She blushed, then I started rubbing my hands on her back and down her legs. As my hand brushed back up her leg it went underneath her princess skirt, all the way up. My hand went around her panties and I caressed her little butt with my hand, then I kissed her again.

While she lovingly rubbed my cock and kissed me, I gave her butt a squeeze, pulling her a little closer to me, then I slipped my hand down the back of her panties and felt her warm naked ass. I rubbed her plump butt cheek for a while and then slid my hand around to her front and rubbed her pussy. She gasped but continued to smile, and she didn't tell me to stop.

We laid nose to nose, she was rubbing my cock and I was rubbing her pussy. We were both breathing warm air from our mouths on to each other's faces. There was a sudden heat between us as her pussy started to moisten. She didn't protest when I pulled her panties down her legs and off her feet.

I rolled over so I was on top of her. We were both silently looking at each other's eyes. Her legs parted and I slid between them. I lifted her arms up and lightly held them down above her head and I kissed her tiny neck. She was gasping happily as my cock found and twitched at her entrance.

I slowly pushed it against her pussy, because it felt like that was what I was meant to do, it felt good. Soon it was in the crack of her pussy and I felt her wetness, I began to thrust harder, really pushing my cock in to her crack, and a few minutes later it happened, she yelped, and I felt my cock tear through her entrance and it went inside her.

She didn't scream or tell me to stop, she scrunched up her face a few times from the pain of me penetrating her, but other than that, she didn't seem too bothered by it, so I kept thrusting and soon I was having sex with her, her soft wet and warm pussy was clinging tightly around my cock as it moved in and out of her hole.

I had been extremely horny all day and was already on the edge of ejaculation. I'd say less than 2 minutes later, I ejaculated, I could feel my spunk shooting out of my cock and filling her pussy up, when she gasped and moaned, I knew she felt it too.

She was just staring at me with a blank face and we were silent for about a minute, then she spoke, "Does it feel better now?" she asked.

"Yeah." I replied.

She smiled, then reached across and picked up the cake off the table and offered it to me, "Do you want some cake now?" she asked.

I smiled and chuckled, "Uhm – Yeah. Thanks." I replied.

She genuinely didn't seem the slightest bit bothered that I had just fucked her on my bed. I got off her and we shared what remained of the cake, then she got out of my bed and went in to her own bedroom. I found her panties under the sheets and held them to my face and sniffed them, they smelled so good.

A/N: Please comment if you find any grammar mistakes as it's for all of us to enjoy. Powerstones would be appreciated to keep me motivated!