Yes, the planet Hilaris is populated by an intelligent species. The dominant species is a social animal that appears to have evolved from a canine-lik... predecessor. Their civilization is on a par with homo sapiens as they began emerging from a hunter-gatherer culture to one with developed farming and rather extensive trade routes. They still travel on four paws but the front paws are unique. The four toes appear to be upside down with heavy pads on what we would think of as the knuckles. What. I started sucking her nipples and made her unzip my pant to release my throbbing cock. She also pulled down my underwear. She was surprised by the size of my cock as it was the first time she was seeing a cock in reality.I made her sit on the cot and told her to take my cock I her mouth. Initially she resisted and I assured her that it would be nice and erotic. She accepted and took it in her mouth meanwhile I took off my t-shirt. Now I stood completely naked in front of my sil and fucking her. I could tell I was no longer the exclusive - or even the primary - focus of her desire. She was falling in love - falling head over heels in love - with Paul. And although my sister and I remained as lovers, I could feel the difference in our couplings. The old frantic need for closeness; the intense demand for acceptance that had once dominated my sister's surrender of her body to my every whim was no longer operational. What sex did occur between us was soon almost casual - incest became. White said grunting.There was quiet then, except for grunting and panting. I slipped slowly forward until I could peak into the kitchen. There, sprawled facedown on the counter, was Mrs. White. I could see her torso, but I didn't move forward enough to see her husband fucking her, and more importantly, for him to see me.Mrs. White's head was turned towards the door, and when she saw me her eyes got wide. Suddenly she grunted, "Oh my god, Oh my god, I'm cumming!" as she tensed and came. However.