"I decided to point out an anomaly to Hilary."How long did you say it was before the pink cells go to purple?" About a half-hour, normally." And they ...tay purple until they're inseminated again?", I asked."That's right." That's what I thought. Well, the cells I took from Sue's ass were purple, right enough. It was about an hour after we'd... well, anyway, the point is that during the night they went back to pink again." What? Without sperm? Are you sure?" Unless somebody sneaked into the lab. " "I'll agree with that!" Dad responded and sat back down. When I got out to the garage, she was bent over the hood of her car, her shorts and panties were in a wad at her feet. She gave me a smirk and said, "I dare you to fuck me right here and right now with your father there in the house." No worries," I replied and stepped forward. I pulled my my aching hard cock from my athletic shorts and pointed it just below her fine ass until it slipped into her steaming hot pussy. "Do it quick!". "Afterward, on my way home, I started to get nervous. I wasn't sure what I should tell David. While I didn't want to lie him, I didn't want to make him feel insecure or inadequate either. Jeanne told me she had a similar concern about you. When I got home David was waiting for me. As soon as I was inside the house he took me in his arms, kissed me and told me how much he loved me. That made me feel more confident. The kids were both in their rooms, so before David and I retired to our bedroom I. ‘So come on then,’ laughed Purity sitting up and undoing Innocence’s blouse, which was soon off, lying on the grass. Innocence’s beautiful breasts were just about contained by her bra, which was as always just that little bit too tight. ‘…And the skirt…’ laughed Purity, eyes were now sparkling with excitement. ‘No! Not the skirt!’ Innocence argued, knowing that her secret would be seen under her nickers. ‘Yes! The skirt!’ giggled Purity who had already discreetly undone the waist (Innocence.