My dad was 62 and I saw him couple of times being naughty with my mom. After couple of days of spying, one day I encountered my parents in action. It ...as wonderful scene to watch. My dad was doing my mom in a doggy style & was also inserting his fingers into her asshole. Then after 2 mins he removed his cock out & told mom to kneel & came all over her face. That part was very surprising for me & on top of that she licked everything thing off her face ending up swallowing it. Later on dad told. On average, at least based on the ones Nadine had already flagged as 'possibles', they came in at around 92.23 percent! That meant, among other things, that these guys had some very fertile sperm! WAY, WAY higher than mine!As Nadine and I worked our way through these different men and their 'stats', I started getting more used to the idea of her 'having sex' with one of these other guys. I say I started getting used to the idea, but the idea was one thing, but what would it be like if she and I. . I cannot hear you, bitch!”I moaned “yes, fuck me with all those black huge cocks” as I felt the second guy was arching his back and filling my womb with his burning black sperm…I lay there spent, with sticky cum running between my open thighs, as the last guy got behind me and slapped my ass hard, until with just one mighty thrust his cock filled my open wet pussy. I felt he was the biggest cock and I thought that was the reason to be the last one to fuck me.He fucked me really hard, after. For example, if the best I could do was to get within plus/minus three pockets of the target, then I should play at least another thirty times to get some statistics for how often I hit each pocket as it was unlikely to be a flat distribution."I'd guess two to three hours should be sufficient. If it took longer than three then I've either hit a serious problem or we're gathering statistics for a wide spread of results, if you know what I mean?" Prof nodded that he did. "Taking less than two is.