All participants in the sex in the sex are over 18. This is my fantasy and in my world there are no STD's or unwanted pregnancies. Do not try this at home.
I hope you enjoy the story.
My cock was only semi-hard at the moment, mostly my early morning wood, and it was laying between the cheeks of my sister's ass. As I thought about where it was, it began to grow. Not morning wood now, a full blown erection was growing. I could feel its length growing and sliding further between her thighs, slipping past her asshole, and into her pubic hair. Still not moving, I gloried in the feeling of being this close to my sister and her pussy.
My wife and kids returned home the following night. Although we had more nights at the drive-in, my sister and I were never there alone again. But, that didn't keep us from spending time together.
In some ways, it felt like there was a budding romance between my sister and I. We spent as much time together as we could. My wife hated grocery shopping and seldomly wanted to go. Laura would come with me to help out instead. Along the way, we would pull into the local high school makeout spot, usually abandoned during the day, and take our turns.
Kissing Laura was such a turn on. She was a great kisser. She was a passionate kisser. Her lips were so soft, her tongue so active. My sister would trace the outline of my lips with her tongue, gently sucking on them. When her tongue would slip into my mouth, it would seek out mine and the dance would start. I felt just like a kid again, making out with his first girlfriend.
My sister was a big girl. Not fat, mind you, just big everywhere. Beautiful in a Rubenesque fashion. Unbelievable tits. Firm, heavy, and with just a little sag. I had discovered they were 38D's. Her nipples were immense. Rosy red and jutting out from areolas only slightly larger than her nipples. When excited, my sister's nipples would grow close on to a full inch and very thick. I had previously discovered how responsive and how sensitive Laura's nipples were. I could play with them for hours on end.
Hours on end, given the opportunity. There was very little opportunity the way things were. We just couldn't find enough alone time without my wife becoming suspicious.
But, perhaps, life as we knew it was going to change. It was a Saturday afternoon and pretty quiet around town. So, I took advantage and came home early. The house was quiet as well since my sister had taken the two kids to their grandmother's house for the weekend. Laura would be home later.
I went upstairs to my bedroom and found my wife busy with her sewing machine which was located next to my bed. I plopped down in my bed and began some idle chit chat with the woman I was married to. Married to and cursed for life it seemed. Carol was not the same woman I had married years earlier.
I might have been dozing when I felt a body thump onto the bed, resting against mine. It was my sister Laura I discovered snuggled up to me upon opening my eyes. She started chattering away with her sister in law. Lying the way she was, Laura was squishing my arm into the bed, threatening to cut off my circulation. The two women didn't even pause in their discussion when I rolled around to pry my arm from under Laura.
Having freed my poor, put upon arm, I didn't quite know what to do with it. My sister didn't look at me, she just grabbed my arm and moved it and her body around until she was laying quite comfortably on my shoulder with my arm around her.
The chatting between the two women must have been getting interesting as they were laughing and giggling. I couldn't bring myself to pay any attention. Before too long, I was fighting to stay awake again.
And, once again, my dozing was brought to an abrupt end when Carol lifted my arm and plopped down beside me on the bed with her head on my shoulder and my arm wrapped around her.
With no plan in mind, or even any conscious thought for that matter, I began to rub both my sister's and my wife's back. Just gently and casually. The two women in my life seemingly didn't notice what I was doing.
The rubbing turned to caressing the two. I reached my arms down as far as I could so that I ended up caressing them from hips to shoulders. Due to the positions they were laying in, their boobs were somewhat hidden from me and far from my caressing hands.
I'm really not sure about the how or when of it, but the girls adjusted their positions so that my next downward strokes passed by their waists, their hips, and onto one cheek. Finding that I could caress one each of their cheeks and reach a questing finger into the crack of their asses, I did.
Carol's ass was, of course, well known to me after years of marriage. It also wasn't very exciting any more as it had grown soft and flabby over the term of our marriage.
Laura's ass, on the other hand, was strong and firm. Since it was also a recent discovery, it was extremely sexy. I treated each ass equally though. Neither girl could see my hands or arms on the other as their bodies blocked their view.
My wife's ass was just there. Laura's ass was so sexy. She wriggled it slightly. I'm sure both of us were getting turned on by the thought of us playing this sexy little game with my wife right there beside us. Again, the two women adjusted their positions making their asses more available to me. Both had hands resting on my lower stomach, pretty close to my cock.
My dick was getting interested in the goings on of my hands and the sensations they were delivering. Part of me wanted to chuckle at the thought of Carol believing it was my rubbing her ass that was giving me a chubby while my sister had to know it was her own beautiful butt that was turning me on so much.
My wife slid her hand slowly down my stomach and further down until it was resting on my cock. Slowly she stroked it while my sister's hand drifted down to my waist, resting just above my crotch.