Horny Night

My older sister came home semi drunk one evening and walked into my bedroom. I was playing a video game at the time, so didn't hear her enter.

I noticed when she sat on my bed and put her hand up the hem of my shorts.
It made me jump, but also made my cock harden quickly. And that's the response she was looking for.

Yanking my shorts down, she had my cock in her mouth in no time. And I just let her get on with giving me a blow job.
And the reason all of this happened, is my sister had spoken to an ex girlfriend of mine and found out I have a large cock.

She'd gotten horny thinking about me and deciding to see, in her half drunk state, if I'd fuck her.
It never got to me fucking her that night, but a week later with our parents out for the evening, I fucked my sister on her bed. And trust me, it was her being horny all over again.
From then on each and every chance we got, we were fucking.
Oral sex, vaginal sex and anal too, once she'd learned how to take my cock up her arse.

Most weeks we'd be fucking four, maybe five times. Some weeks it'd be a lot more.
When she found out she couldn't have kids, our sexual times together went to another level and she'd sneak into my room to spend the whole night together.

Then our mother found out, so we stopped for a while.
But both absolutely crazy about one another by then, we began having sex no matter what our mother said.

And to this day we live as man and wife. Obviously we're not married, but we now live in another part of the country.
We still have sex every single day and I guess we'll always do so.