She leaned over Kathleen, meeting her eyes. “Here you GO!” With that last syllable, Vi thrust all the way in and physically jerked as the first r...pe of cum shot out of her and into her sister. Kathleen shivered as she felt the fluid splash against what felt like the bottom of her lungs. Violet pushed again at Kathleen’s crotch, spasming again as more cum was deposited within Kath’s womb. After three times, the strength of the ejaculation hadn’t subsided. Violet and Kath laid there on the floor. “Yes! Really,” she answered in indignation.“Let us tell you how we got in here and what we have learned so far,” Chris asked her.“Go on!”“A little background first,” I told her. “Our father was a Field Agent for the Agency. He was retired about eight years before we were born. He has always been security conscious, and became more so when he met and married our mother.“About a year after we were born, Uncle Lester came down to Georgia from the Agency to try to convince dad to rejoin the Agency.. ” She said seductively.With that she pushed me backwards onto the toilet, I then sat down and watched the show. She turned around and then began to shimmy off the dress. Jeez she was so hot, not the best tits, but she was in shape, and man her ass was amazing, she quickly kicked the dress to the opposite side of the bathroom, leaving her standing there with just her matching black lacy bra and thong, her thong rode up into her ass, providing myself with a view that I had up until then, only. But, finally, the lust within me overtook my rationale as I took a glance at her seemingly innocent face. It was lit by moonlight and I could see the curves of her boobs in the dim light.I put my left hand on her hand and waited for a while. No reaction. Maybe she was really asleep but my leftover rationale tried convincing me otherwise.Right when I was thinking this, the bus went through a big pothole and her boobs bounced as a result. Her chunni fell off and I could see her black bra strap.