When I found my children like this, I was surprised when I wasn’t immediately horrified. In fact, I was really turned on. I started rubbing my clit and pinching my nipples as I watched my daughter ride my son’s cock.
"Oh, fuck, I’m gonna cum," my son moaned.
"I’m not on birth control…" my daughter intoned. Somehow I got even more turned on when I heard this. I couldn’t keep myself hidden any longer.
"Cum inside her!" I suddenly shouted, "Knock up your sister!"
My son glanced at me as he pulled his sister’s hips down so that his cock was buried deep inside his sister and then started grunting loudly, making it obvious he was doing his best to follow my instructions.
My daughter, for her part, was cumming loudly while staring into my eyes. I began undressing, knowing what I now needed.
After my daughter slid off her brother, cum dripping from her freshly-fucked pussy, I said to my son, “Mommy needs a baby, too.”