I waited a few days and watched her. She was on top of the world. She was going to go to college and everybody was so proud of her. She even got a new...car from her folks as a reward for getting in. Now it was time. I called her late that night and told her I had proof that she cheated and If she wanted everybody would know what a fake she was, and she would never even get in to community college. She started to cry over the phone. Such sweet music to my ears. I told her if she wanted the packet. She had found a pack of rubbers in Fred's pocket when she was doing the wash and wondered why. She said she had her tubes tied when their last baby was born and had been "surgically safe" over 10 years. After thinking about those rubbers she hired a private detective and he brought her pictures and videos of the two cheaters doin the dirty deed.Now I will admit to having the kind of mind that sees things a little different than most folks. I am not sure I would call myself "the sneakiest,. "Dont you know how to fucking knock!" He yelled at me. "Im sorry.... I guess i should have. But... Well, i don't really mind watching you..." There it was, the moment of truth, whatever he said next was what the rest of the night will depend on. It'll either be awkward as shit, with me probably sitting alone in the basement and him doing whatever in his room till his mom got back, or me having a little bit of fun. And him too, offcourse. "Really?" He asked with a relief."Yeah, it'll be our. We really need to get back on the road, though. So, if you would just help us get on our way." Not so fast," Dad replied, a naughty grin still on her lips, "You need to wait for our babygirls, they'll be so pleased to have a new set of playthings."We'd cleaned up a little, but were still waiting naked in Mom and Dad's house when we heard a new set of visitors enter the house. They entered the room and were introduced to us as "Big Sister" and "Little Sister". Both bore enough of a resemblance.