Cory reached up to put the spice in the upper shelf, that's when it all started. She was wearing a sleeveless nightgown and when she reached up I had a full-unobstructed view of the side of her breast. I was staring at her breast alright, thinking wow what a beautiful breast, when she put her arm back down and I looked up to find her looking right in my eyes. Cory is my sister in law, she had moved in with my wife and me a month earlier while she attended a local university. Cory is really cute with a nice little bubble butt and very full breast. She does not have a hard body but she certainly is not fat either, I think she is just about right. Cory's hair is a reddish-blonde and she has the most amazing blue eyes. I knew she had caught me looking at her breast but she didn't say anything. I blushed and started rambling about the weather or something and she smiled and went on about her business. Gosh, I felt like a drug addict I wanted/needed to see more of her. I knew she was really cute but had never really focused on the sexual aspect of her now it was in my thoughts night and day. My wife Janis and I had great sex and I would consider us a very liberal couple as far as sex is concerned. We enjoyed trying different things and took chances at times making love in our car in parking lots after leaving a bar or in a roadside park. We enjoyed the chance of being caught. But Cory was my sister in law, my wife's baby sister. How could I get her involved with us sexually? Janis and Cory would run around the house at night and in the mornings with little thin nightgowns on all the time and at times I would catch a peek of Cory's panties or a quick peek down her gown when she bent over for something. But nothing really good until one day our cat gave me the opportunity I had only dreamed of. Janis had gone to Wal-Mart leaving Cory and me at home for a while. Our cat was very pregnant and we had been on cat watch for several days. Cory had been looking for her to put her out to go to the bathroom before bedtime when I heard her call me. I walked in to Cory's bedroom to find Cory in her nightgown on all fours bending looking under her bed, her butt was in the air and all she had on under it was a G-string. I was looking right at one of the most beautiful butts I had ever seen. She looked over her shoulder to find me staring at her butt but never moved she simply said the cat had had her babies and had hidden them way up under the bed. The bed was up against the wall on one side and this was the only way to see under the bed. I tried to regain my composure and bent down beside her to peer under the bed. As I bent down I couldn't help looking again at her butt right there beside me and noticed curls of her strawberry red pubic hairs peeking out the sides of her G-String where it came down to just a string. I finally scooted further up to look at the cat but could barely see the cat in the darkness so I told Cory I would go get a light. I came back and Cory was still in the same position giving me a perfect view of her butt. I laid down beside her to shine the light under the bed but as I did I found that by laying down I could see Cory's gown was hanging down to the floor and I could see straight up under her gown to her pretty titties hanging down. I stopped to look and again when I looked up she was looking right at me. My dick was getting hard in my shorts as I slid up beside her, we could not reach the cat or the kittens to move them so decided we might as well leave her alone and we would just check on her every now and then. Janis came home to find us on all fours side by side peering up under the bed. Cory in her nightgown and G-string and me in my boxers and a t-shirt, both of us on our hands and knees. We explained what was going on and she slid down to the floor to see the kittens herself. I knew my dick was still semi hard and I guess Janis noticed too because as she bent beside me she reached between my legs to grab hold of my dick. She gave me a gentle squeeze and smiled at me. My semi- hard dick was now very hard. There was not enough room for the three of us so Cory got up to give us room I shined the light as Janis looked at the new babies. When I looked over my shoulder, Cory was behind me looking straight at my hard cock tenting up my boxers. She smiled and just stood there. I tried to will my dick to get softer but the more I thought about it the worse it got until I finally just got up and walked out to the living room. Cory got a really good look and Janis did too. The girls stayed in the bedroom for a good time after I left and I finally got up to go shower and get ready for bed. Janis wasn't for behind me and after her shower she looked great standing in the light of the bathroom the warm red glow of the hot water looked great on her. She came and slid in bed and was soon squeezing my hard cock. She pulled the covers off of me and started to jack me off slowly while she kissed me. She giggled and asked if I had cooled down any from earlier? I told her I could not help it, Cory was half naked and had her ass in the air with nothing covering it but went on to say, "I didn't do anything." She laughed and said it was ok. She slid down and took my hard cock in her mouth. I had my eyes closed actually thinking about Cory when I opened my eyes to look down at Janis I caught a glimpse of movement in the doorway. I didn't look directly at the door but watched out of the corner of my eye and realized Cory was watching us. I heard a small creek in the floor just as Janis swung her legs over me and placed her hot pussy right down on my mouth. I was licking Janis's pussy and could no longer see the door. I was so turned on knowing Cory was watching us I was having a hard time holding back. Janis was incredibly wet and came suddenly without warning. She never quit sucking me off though. It felt so good she was flicking the head of my dick with the tip of her tongue. Then I realized Janis was sitting up! Nothing was said, Janis spun around and positioned herself over my hard dick. As she squatted on to me I saw Cory standing at the foot of the bed naked watching us. Janis slid down taking my hard cock into her in one motion. I reached up and began to play with Janis tits and felt a hand cupping my balls. I knew it was Cory. Janis was slamming down on to my dick and it wasn't long before I erupted deep inside her. Cory slid into the bed beside me as Janis slid down on the other side of me. My dick never really got soft. I reached over to play with Cory's breast and her nipples got hard to my touch she let out a small moan as I rolled her nipple between my thumb and finger. Both girls were reaching down fondling me and within a minute or two I was completely ready again. Cory slid around and took my cock in her mouth I reached down to find her pussy dripping wet, the entire inside of her thigh was wet. I slid my fingers up and down her slit and she hunched her hips forward trying to get them inside of her. Janis kissed me and whispered in my ear it was ok I could do whatever I wanted. I pulled Cory over on top of me in a 69 and began to lick her hot pussy. Both girls began to suck and lick my cock. I have never been so turned on in my life. Janis sat up and pulled Cory up and told her to get on all fours. She told Cory he seemed to like that view a while ago. I looked and saw her wet pussy part open as I kneeled behind her, Janis took my cock in her hand and directed me forward I stopped as the head of my dick touched Cory's pussy. Janis began rubbing the head of my cock up and down Cory's wet slit. It was almost an electric feeling I felt in my over sensitised cock head. I could hear the wet sloppiness of Cory's pussy as Janis pulled me forward enough to get just the head of my dick inside of her. Cory was whimpering and pushing back some but Janis kept sliding the head of my dick up and down her slit then began flicking it across her clit. I saw Cory grab a handful of sheets as she came. Her pussy gushed out a huge squirt followed by several smaller ones. My cock was drenched, Janis's hand was drenched and Janis just said, "Wow". Cory said, "Do me now". I slid in and she was so tight, it felt so good as I slowly pushed in. Cory was pushing back and whimpering as I made one final shove to get all of me as deep inside as I could. I just stopped feeling this great feeling of tight wetness. Cory began to buck back into me and I picked up the pace and before long I was slamming my cock into her for all I was worth. Janis started squeezing my nipples with one hand and playing with my balls with the other hand. I pounded harder and harder until I came. I felt wetness all around my cock again and knew Cory had also come. When I finally let my cock slide out of Cory's pussy I looked down and the bed was saturated for tor two feet around us. I love my wife and my sister in law.