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My 18-year-old sister and I had been having sex ever since she'd turned 18.
It was hot and sweaty. We were deeply in lust with each other and couldn't wait to get into each other's arms at every opportunity - especially behind mom's back.
There was only one problem: I wanted to knock her up and see her wide with my child. She didn't.
So we used the pull-out method.
It sucked.
For once in my life, I wanted to feel what it was like to cum inside a fertile woman.
The only time she let me cum in her was when she wasn't near ovulation.
But I had a plan - a devious, sick plan. I was going to knock her up when she least expected it.
Late one night, I moseyed on down to the local drug den and purchased myself some ultra-hardcore fertility drugs.
I'd done my research; they would increase a woman's fertility for several weeks following her ingestion of them.
The next day, when no one was looking, I spiked her orange juice with a dose - enough that she'd instantly become fertile.
I couldn't wait.
It was sick and twisted, but I didn't care.
That night when mom and dad had wandered off to dreamland, leaving us siblings alone, we started making out. With one difference:
Sis was openly ovulating - and thought she wasn't.
She was studying for her finals naked on her bed, her long, sexy legs kicking up behind her.
I grabbed her book and set it on the bedside table, then pressed my throbbing erection to her oh-so-sexy, plump lips.
"What do you expect me to do with this?" She grinned, then grasped it gently in her hands.
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