Wife's Sister Sister Wife

Synopsis: Rewriting the relationship between my wife, her gorgeous step-sister, and myself.

Tags: MC, MF, MD

Note: "My Erotic Fiction", meaning you cannot repost it without permission; it may be illegal/immoral for you to read; and none of it is real.

Note 2: There is some FF, and a little 'faux' incest

Note 3: Illustrations by SlimMckenzie, using Daz3D. Thanks so much, Slim!

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Wife's Sister Sister Wife

I met Liz Homes a few years ago when she was just 22 and I was beginning to see thirty approaching. We met when my company, Evans Engineering, was offering some local grade schools 'at cost' help with their networking and other tech needs. The sweet, cute, warm, young third-grade teacher caught my eye and I asked her out after a few meetings. Liz looked so young that she was carded when we ordered drinks for dinner, something that still happens and usually makes her smile. The date went well, and we got married a couple years later. Liz kept her maiden name since it was what 'her kids' were used to. Several of our friends had done something like that so it was not a big deal to me.

She is not and never was my ideal woman as far as looks go. She is petite at about 5' 4", slender without much of a figure (great legs, though!), and she not very sexual. We could go months, especially lately, without much physical intimacy and she almost never initiated it. She also did not want anything 'kinkier' than her on top, not even oral. Sometimes she was in a cuddly mood, but most of the time I just got a couple daily kisses and that was it. But, you love and marry a person for the complete package- not just the bedroom. Besides, I was not much myself- pretty large and dumpy for the first several years of our marriage.

Her personality has remained warm and sweet, but she also had a streak of stubbornness. We could not discuss something like meal planning or where to go on vacation until she was ready. Common refrains were 'she had other things on her mind', or 'she could only work on one thing at a time' (and a school thing almost always trumped a home thing). Again, not a big deal, just another minor frustration in life.

I owned and ran the aforementioned electrical engineering firm which made enough that money was rarely an issue. We had a nice chunk in savings and investments, a nice house, nice cars, and so on. I enjoyed a handful of hobbies and had a small circle of my own friends. I've even been hitting the local gym hard in the last few years with decent results. I was pretty damn content overall, letting on-line sites serve as a replacement when I wanted sex and she did not (in other words, most of the time.)

Things went along pretty much as they do for everyone- OK with a few bumpy patches. Thanks to the economy, our careers did not advance the way we sort of hoped they would. We apparently couldn't have kids. We lost touch with family as they moved or, sadly, passed away (divorces on both sides helped further fragment the families).

One bright note was that Liz's younger step-sister, related by marriage, decided to move back to our state after having lived along the southeast coast with relatives for most of Liz's life. It was easy to forget that Ashley even existed- the two had not met face to face in over a decade, and she almost never wrote or called outside of a short Christmas letter. Liz invited her to visit after yet another relative passed. I'm sure she felt a need to reconnect with what little family she had left.

We were at the airport and Liz felt foolish holding up a sign with 'Ashley Holmes' on it, but we did not have a clue what she looked like now. Liz was so cute, searching the crowd for her long-lost little step-sister, holding the sign toward several women.

My own attention was caught by a tall voluptuous woman sashaying down the ramp in a fashionable outfit glued to her considerable curves. She had blonde hair that cascaded past a model's face with big dramatic eyes and mouth, then bounced along on top of her mile-long cleavage. The somewhat stressed top was tucked into snug dark slacks that caressed every glorious curve as her wide hips flicked side-to-side coming down the ramp, large breasts bouncing in counterpoint. Her looks made her stand dramatically apart from the rest of the horde in the concourse.

Her eyes caught mine and she smiled. I was getting hard and could not look away. Her eyes flicked to Liz and her smile shifted somehow and she shook her head just a tiny bit. She passed a few feet from me and I caught a whiff of her intoxicating fragrance, barely restraining a deep sigh as I resumed scanning for Ashley.

The scent tickled my nose again as I felt a warmth behind me, then an arm reaching between us to tap Liz on the shoulder. "Hi, sis!" The tall vision spoke in a warm, accented voice that sent tingles down my back as she gathered her smaller, and suddenly very childish-looking, older sister in a big hug. Liz's head barely reached Ashley's shoulders.

"Ashley!?! I did not recognize you at all!" From that instant, Liz fired a barrage of questions at her rediscovered sibling as we went over to gather her luggage. How was she, what had she been doing, where was she staying, and more came like machine gun fire as Ashley tried to keep up. We got her big pile of luggage and I wrestled it back to the car. We stopped for Thai on the way home, and were soon sitting around a demolished pile of take-out boxes with the sisters deep in conversation.

I mostly just sat back and stared, trying to be subtle about it. Ashley was somehow even more sexual now than when I first laid eyes on her. Glittering blue eyes, hints of big dark nipples through her silky top, a cat-like and incredibly sexy grace as she moved and lay askew on the couch... and the voice of a phone-sex operator that you paid extra to get a charming southern accent.

She was recounting tales of strings of boyfriends, working at dozens of jobs (with risqué hints of rather 'adult' choices), staying with relatives up and down the coast, and adventures in several cities even as she oh'ed and aw'ed over what Liz told her we had been up to. They chatted well after I went to bed and dreamt rather naughty things about Ashley.

I woke up to the smell of cinnamon rolls and coffee. Struggling upright, I hit the shower and took care of my morning business before heading to the breakfast nook. I was surprised to see Ashley sitting there with Liz- I had thought that they would go to Ashley's hotel after I went to bed. Turns out they slept in the spare room so they would not bother me and could keep talking, making an impromptu slumber party out of it

Liz was in a typical flannel long nightgown with a robe over it, but Ashley was in one of my T-shirts and a pair of Liz's way-too-tight running pants. She filled the shirt out so much that it did not cover her midsection, and since I could see both clearly raised nubs and the darker area under the stretched material I knew she was not wearing anything under it. The skin-tight shorts revealed an enticing camel's toe and clearly showed a lack of panty lines. I was struck again by how much older and mature Ashley looked than Liz. My 28 year-old wife looked like a barely pubescent teen next to the taller, more voluptuous, more womanly 25 year-old step-sister.

I ate breakfast rather mechanically, desperately trying to ignore the sight of Ashley pendulous breasts or letting my mind wander to uncomfortable places as I took in her still delightful fragrance. I realized Liz was trying to talk to me. "Sorry, what?"

"I swear, you are so not a morning person." She smiled. "I was asking what you would think about letting Ashley stay here for a while. We have the room, and she does not know anyone in town." I stammered an agreement, not that it would make much of a difference, and drug myself away to get ready for work before I did or said anything stupid, or, more accurately, stupider.

The next couple of weeks went well enough. I was somehow becoming rather accustomed to the idea of having someone modeled after all of my wet dreams with seemingly no modesty living with us. It was perfectly normal for Ashley to wander around in skimpy tops without a bra or a nearly untied robe, or for her to be casual about closing her bedroom or even the bathroom door sometimes. Liz said it was 'just part of her free Bohemian lifestyle'. Liz often sighed that she wished she could be so free and open about herself.

Ashley would occasionally manage to brush me with a heavy, warm breast, and loved to make innocent-seeming comments that were dripping with innuendo or double meanings. One of her favorite tricks was to drip something on the top of a mostly exposed expanse of creamy tit-flesh, then wipe it up with a long finger and slowly suck it off as I watched. It was exquisite torture watching her slender, crimson-tipped finger slide over the smooth resilient flesh. I spent more time than usual 'catching up on work' on the computer. I even 'borrowed' a pair of her used, deliciously fragrant silky panties or tiny thongs a few times, making sure they went straight back to the hamper.

Liz was gone for the night, having resumed her weekly gatherings with her teacher friends, and left something in the oven for Ashley and me for supper. Since it was a casual meal, I took mine into the living room to watch some TV. I did not really notice Ashley settling into the nearby chair until I caught her scent- the same intoxicating one she wore that first night. At first, she just sat and ate. When we were done, she took our plates out and came back, sitting next to me in the loveseat, swiveling her long legs onto my lap.

"So, Samuel. What is it like being married to the scrawny ice bitch?" I was startled by the question and started to sit up, but was held in place by her legs. Her using my full name actually turned me on a bit. Most people just called me Sam. I stammered something about not knowing what she was talking about.

"Oh, come on. She was such a prudish goody-goody two shoes growing up, and she seems to be exactly the same now. I'll bet she was a virgin when you married, and from what I have seen, I also bet you don't get a lot of sex from her." I managed some sort of rebuttal.

"If that was the case, why do you spend so much time on the computer late at night, and why do I sometimes find my delicates have been... ahem... 'disturbed'?" I went red and began to bluster. "Oh, it is perfectly OK with me if you borrow them once in a while. In fact, here." She tossed me a small bundle- a pair of bright red lacy panties with a definite musk scent, and still warm. I fumbled with them and tried to hand them back. "Eh. If you don't want them, go ahead and drop them in the hamper as you go by.

"But seriously, Sam. You are a good-looking man. Tall, well-built, good looking. Your time at the gym has really payed off for you. You're not super rich but you are quite well-off, and seem intelligent enough... at least when I can get you to talk around me. Why are you with someone like her instead of someone like me?"

"Like you?" I did not -quite- stammer.

She wriggled her toes on my lap. "Someone who loves sex. Someone that would look good on your arm and be able to help you professionally. Someone who would fuck your brains out on a regular basis and send you to work with a fresh blowjob and a smile on your face. Someone, like ah said, like little ol' me." She was pouring on the honey-sweet drawl. God, that affected me!

I almost had to shake my head as I swatted her foot away. "I'm sorry if I am sending out the wrong signals, but I love Liz and wouldn't do anything to harm her or our relationship." Ashley smirked as she shifted position. Her top gaped open to reveal most of her creamy breasts. I watched them move as she breathed. Then she laughed and broke the spell. I had to excuse myself and go to the den to watch something innocent on TV to cool down.

For the next month, Ashley did what she could to get a rise out of me. She came in to use the bathroom when I showered, sent me innuendo-laden texts, she even sent me nearly X-rated selfies with innocent-sounding captions dripping with meaning, like the tit-shot that included nipple captioned 'Support the fight against breast cancer. Breast Cancer Awareness Week! I was pretty sure it was her breast but I certainly could not prove it. I began to find her used panties 'accidentally' laying in the bathroom- sometimes even in places like my jacket pocket. Whenever she would pass by me, she always made an effort to make contact- usually with involving tit or ass. One night she started feeling my arm muscles and cooed to my wife "He is so strong. I bet you feel really safe with him around?" Even as she was doing this, her other hand was out of sight and slipped under my slacks to caress my ass. When I flinched rather badly, both women tittered about how shy and embarrassed I was.

One of the more evil things she would do is to leave a drop of her perfume... or sometimes a more personal scent... on my pillow.

And it was working. Oh, god was it working. She was about all I thought of when I stroked myself. Even when Liz and I had our rare sex, all I could think about was what it would be like with Ashley. I almost called out her name once. Just imagining what her breasts would feel like in my hands, her lips on mine, running my hands in her hair or along her hips; what her pussy would feel like... I could almost come without touching myself if I thought about it enough.

Even as things were heating up at home, things were happening at work. At Evans Engineering, we encourage 'skunk works'- small groups of employees working on their own projects as long as the project helped the company or the community in some way. Some of our best stuff has come from this, even if a lot of the 'projects' were just thinly disguised ploys to build fighting robots.

One of my 'go to' guys, Ed, was excited over the results of a learning aid he was working on. It was basically tricked out 3D goggles, souped-up noise-cancelling headphones, wired-up gloves, some sensor pads, and a rather clunky-looking piece of customized software on a laptop. For the presentation, he brought in my receptionist, Tessa, and had her sit in a comfortable chair. He hooked her up to the equipment ("This will look better in a production version" he assured me), and brought up the app.

He explained what to do if she had a question or needed help, and how she could terminate everything with a word. When he was done explaining he told her "Hit 'start' whenever you are ready." She flicked a finger, then for the next ten minutes, her fingers and head moved smoothly and steadily. Her body swayed a couple times, and her breathing sped up for a while, then calmed back down. Some of the cables must have been sensors as a display on the screen showed her pulse and other readings also speeding up then slowing down.

As she was moving almost randomly in her chair Ed explained that her brain was being assaulted with multiple types of input at different levels and intensities. Some of it was almost subliminal stuff, slipping in her eyes and ears when her attention was busy elsewhere; others were riding on frequencies that easily imprinted on the memory structures in the brain. He explained that a key feature of the program was basically distraction- keeping part of the brain focused on the hat while the magician messed with the hidden rabbit. By balancing multiple streams of data in this way, the brain accepts the new information easily and treats it as an absolute truth. Because he was that kind of guy, Ed also made sure I knew how much other members of his team helped, especially the one with the advanced psych degree.

When Tessa turned off the system, Ed slipped the tech off. "So, how was it?" he asked, smiling.

"That was definitely interesting. I choose the 'Intro to Calculus' module, failed the pre-test totally, and nearly aced the post test. The weird thing is... I don't remember it actually teaching me anything; I was just playing an old video game most of the time. It was like the knowledge was already there and the test just unlocked it." We spoke for a few more minutes and I asked her some calc questions of my own. She did indeed know the topic. Considering that math was one of her personal weaknesses, this was pretty amazing stuff. Then Ed dropped a small bombshell on me.

"We also found we can use the device to modify behaviors. Tanya used it to stop smoking, and Jim used to it help get himself back in shape." When I asked how that was working, he told me that Tanya had not smoked or gained weight in over a month, and that Jim was losing about eight pounds a month and could already do some pull-ups! I admit to being intrigued by the mental image of the 'much larger than I ever was' Jim doing a pull-up. I was briefly ashamed of a quick frisson of pride that since I've been working out, I can do pull-ups and more pretty easily.

I thanked Ed for his presentation and did some paperwork for him and his team to get a 'first round' bonus (they would get more if we formally adopted the project, then would get a share of the profits if we sold it.) Then I settled in to read the supporting paperwork.

I cannot put my finger on when my motivations for reading it changed, but I began to fantasize about using it on Ashley and/or Liz. At first, I was thinking that I could use it to get Ashley off my back. A bit later it occurred to me that maybe I could use it to get Liz to act a little more sexual. I could give Ashley some modesty or inhibitions and relax the same in Liz. Hell, I could pretty much swap their attitudes in this sort of thing. I could even...

I sat up in my chair, a plan hatching nearly fully-formed in my mind. I would need to test different aspects of it... of course! Suddenly a plan for that came to me as well. I set aside several hours a day for the next week to research and develop the plan.

The next few weeks were busy. I did most of a day's work in the morning, then used as much of the afternoon as I could to do experiments, usually using Tessa as the guinea pig. I was astounded at how easy and effective the system was. I quickly found I could use the device on her and get her to forget that I did, although it took a lot of trial and error to find the best way to phrase things so her brain naturally accepted it.

I changed her snack preferences towards fruit, and weaned her from coffee to water. She joined a gym, not missing a session, and it was 'all her own idea'. By the end of this time she felt it was perfectly normal and appropriate to not only show me her shapely bared breasts, even asking me to play with them. I resisted taking this further with Tessa (she is cute but happily married) and looked forward to taking the system home. I also made sure to erase or hide everything related to the project after approving another round of bonuses for Ed and his team. I also sent him a note that the device would not be marketed until we could find a way to ensure its ethical use- the thought of other people having access to something like this terrified me.

When the big day arrived, Liz was out with the teachers again, and Ashley was trying to seduce me again. Last week, I fell asleep on the couch and woke to her petting my cock! This time I had a trap set up for her. I was using the device to watch an 'interactive porn' program I rigged up starring someone who looked a lot like her, When she came in the room and 'caught me', I maneuvered her into trying it out 'so she would not tell Liz about it'.