"The Institute started testing everyone at puberty over ten years ago, Michael," she insisted."An exception is allowed if the biological parents and t...e child refuse the test," I informed her."Who would do that?" she asked horrified. I turned to stare at her."But even your parents have to be reasonable about some things, Michael!" No, Sarah, they don't," I sighed. "They thought that the Institute was just another government conspiracy. They still do." Everyone gets tested!" she spat.I didn't. I have to be gentle and I will. I love her so much I couldn't bare the thought of hurting her, besides if the experience is bad she may not want to do it again. I laid there and remembered when I tried it with my girlfriend. We never actually talked about it rather I tested the waters a little bit one time when I was fucking her from behind. As I pumped into her I put some spit on my thumb and began rubbing her crack slowly working my way to her anus. When I reached it with no resistance from. I began to feel my orgasm building, and I grabbed her hips and beganto bury myself as deep as I could as I felt my balls begin to pull and Ibegan to fill her with my cum, grunting as she whorishly cried out.My head spun and spun as I came dawn from my sex high, and as I idlyscratched my nose, Becky got up and pulled down her skirt. Smiling at meas I collapsed in my chair, she buttoned her blouse, and gave me a kiss onmy cheek as she left quietly. Great girl. I pulled on my underwear andslacks,. She moved to the patio door. They were lying on towels drying off. It was obvious they had been swimming. When it was just the three of them, swimming attire was optional. This afternoon they were skimpily dressed. Eric was wearing only a pair of briefs. Sara was wearing a tee shirt and thong panties.Both young bodies were covered with sweat and pool water. The scant clothing was soak. The siblings might as well been nude."s*s," Eric says slowly, "Do girls talk about sex?" Yeah!" Sara answers,.