Mum and Granddad

He groaned in frustration when I stopped, “Well years ago, before we started dating, your mother and your grandfather used to fuck.” He said as he reached out to play with my breasts.

I moaned at his touch, “Mum and Grandad?” I said in disbelief.

“Hmm,” he said as he gently thrust upwards, “yeah. She stopped after we started dating, but years later when she told me it was because she had gone away for a family thing and they had fucked again.”

I started to gently rock on him again as he continued, “I was pissed but also aroused. We talked about it over the next few weeks and she told me how much she enjoyed it, how naughty it made her feel.” I moaned as he rolled my nipples in his fingers, “I told her that if she enjoyed it that much, maybe she should continue, but she needed to be careful, always use protection and tell me everything.”

He stopped talking and just looked at me for a moment, “Kimmie, you’re not…” he left the thought unfinished.

“Fertile?” I finished for him, “How about you cum in me and find out.” I said, settling a little further onto his cock.

He groaned and I smiled, “You like the idea of cumming in your daughter’s cunt do you?”

He nodded, “But I can’t. Your mother would kill me.”

I bounced a few times on his cock, relishing the feeling of his monster cock sliding between my lips, “I don’t know… You had to tell her to be careful with Grandad, I think she would get off on the idea.” I dropped down hard onto his cock and felt him bottom out, “I know I am.” I finished.

Dad started to massage my tits, “You get off on the idea of getting knocked up by your old man?” He asked helping me bounce on his shaft.

I stopped and leant forward, “I was just talking about you cumming in me.” I whispered, “But if you really want to try and knock me up then I think maybe I shouldn't tell you when I am fertile.”