He was taking advantage of the break to get his navigation training finished. It would make him more versatile on the ships. He had completed his Pilo...’s training just before his last expedition.David had been living with his father Paul since he was thirteen and his mother Donna had dumped him there. He hadn’t seen her since, and he was lucky if she remembered to ring him on his birthday. She had moved to Perth and had a new life that didn’t include him.His father had been gone for two years. It was so hot watching them, the thought that they didn’t know I was there was fun too. I slowly undressed, stripping off so I was completely naked. I slid my fingers over my slit, I was already quite wet. I gently touched myself, sliding my fingers over my wet opening. I watched them with glee, knowing that they didn’t know I was there was such a turn on. The guy seemed to really enjoy my step-sister and Isabel really seemed to like him too. It wasn’t long before my fingers had slipped deep. I quietly went back upstairs as it was clear they were now cleaning up and going to be coming up. They came up separately, trying to make it seem like they were not just together. I didn't know how to react, but had a guilty feeling of being completely turned on. I closed my door, stripped down, and masturbated for the next hour, having three explosive orgasms and a throbbing mess of a pussy. I approached Jenny several times over the next few weeks, asking her how things were going,. Over and over I felt him thrusting inside me, his hands moving up my body to my large breasts encased in the lace bra. After a bit I felt his cock growing again and then the wonderful rush of his cum spewing into my bowels, load after wonderful load. The hot sensation pushed me over the edge and I felt my clitty pulse in its cage leaking heavy blobs of cum into the crotch of the panties. My head was spinning coming down from the sexual high and I felt him slide out of me, quickly replacing the.