I had woken suddenly up one night and looked around me, and what I saw changed my life forever. There was my father just a few feet away completely na...ed fucking my mother in a lovely rhythmic manner. My mom had her saree up to her waist and I could see her fantastic ass moving in the same rhythm. Her blouse was open revealing her big juicy breasts. My dad would periodically stop fucking and suck on her tits and move his hands under her to feel her round buttocks.This heavenly sight was too. Alex rocked up and had an overnight bag and all the jesting was that Alex had a hall pass since his girlfriend was out of town. The usual Friday night on the Central Coast is footy, drinks, maybe a BBQ at my place. Since I’m one of the few remaining bachelors and my little pad is right on the beach and it is walking distance to the pub it seems to make sense that the boys congregate at my place.This Friday was no different and we ended up at the pub as usual. Everyone was having a good time,. I'd best get a box of files and three sets of alphabet tabs. No! Wait! I had an assistant! I'd put Des to work in the morning setting up the office. He could figure out how to get tape and paper clips and envelopes and all that stuff.I sat down and stared at the shelves, realizing that I hadn't the stamina to work on them today. Nearly 11:30. I wondered whether any of the kids were downstairs. I owed them another lunch for putting me on to Des. I put his papers in with his other stuff and. “Damn Katie, you taste so fucking good, nice and sweet. I would never have thought my sister’s pussy would taste so fucking good.” Mark grabbed his huge cock, holding it at the base. He smacked it on my pussy and clit a couple of times. "Are you ready Katie? Ready to get fucked by your brother and his big cock?" "Yes...do it Mark! I want that big cock of yours inside me." "Open wide dear sister and say ah." He flashed me a wicked smiled and pushed the head of his fat cock into my waiting.