Author's Note: My sister-in-law engaged me in a sexual liaison in which I was a willing partner. The very pleasurable encounters described in the following story resulted from a long-standing flirtation, marital frustration and serendipitous opportunity. I hope you enjoy it. The names are pseudonyms. If your sensitivities are offended by stories involving infidelity, I respectfully suggest you move on.
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I am a 50+ gentleman who, like countless men and women, has contemplated an inappropriate liaison with a marital relative. In my case it involves my very attractive sister-in-law who, especially in recent years, has become a frequent figure in my fantasies. How she came to be a sexual player in my imagination is a long story rooted in many years of mutual flirtation fueled in recent times by my wife's multi-year declining interest in desiring the joys of physical intimacy.
Susan, my sister-in-law, periodically travels from out-of-state to visit my wife Debbie and she stays in our home. Her husband does not accompany her because he is "too busy" to take time away from running his business.
She is a very attractive, mature woman in her 50s. Her height is about 5'6", she has strawberry-blond, shoulder-length hair (colored beautifully), and carries her moderate weight (125?) well on a medium-sized frame. All of her physical features are very attractive; trendy hair style, beautiful green eyes, engaging smile, flawless complexion, full breasts (34/36B?), a surprisingly firm, peanut-shaped ass and nicely toned legs. For many years I have seen her turn men's heads, both in public settings and during private social gatherings, and I, too, have enjoyed the view.
During multiple visits she complained to my wife and me that her husband Edward has grown distant from her, and she suspects he is having an affair. Her anger and pain were clearly evident in the tone of her commentary, and she said discussions with him about his inattentiveness to her needs always degenerated into heated arguments that ended with damaged feelings and no productive results.
Susan and I have always been flirtatious. I am confident that there has long been a mutual attraction transcending the familial relationship that comes with me being married to her sister. During recent visits, the touches have been more frequent, the greeting kisses have moved from the cheeks to the lips and the private, affectionate glances and sexual innuendo between us have become more titillating. I admit to being a willing participant with her in escalating the physical and mental aspects of our closeness.
Toward the end of her most recent visit, Susan approached me after lunch while my wife was otherwise occupied, and she told me she greatly enjoyed her current stay with us, especially appreciating my warmth toward her. I did not know where her conversation was leading, so I just let her talk.
She moved close to me, put her hand on my arm, looked into my eyes and told me, "I am very lonely, and I have been thinking about you for many months. I hope that doesn't shock you."
Without breaking eye-contact, I put my hand over hers and replied, "I have been thinking about you, too, in ways that are not appropriate." I immediately felt that I may have been too presumptuous about the intent of her words, but I was wrong.
She quickly said, "I want you to know how I feel, Mark," and she leaned against me and kissed me, twice, both times softly, and then more firmly a third time which clearly indicated to me she had a pressing need for intimacy created by her unresponsive spouse.
I put my hands on her waist and pulled her tightly against me, feeling for the first time the pressure of her breasts against my chest and the contact of her thighs on mine. I continued the increasing passion of that third kiss and when I put my tongue on her lips she eagerly opened her mouth and an audible groan rattled in her throat.
Our first passionate encounter ended abruptly when my wife called to us from another room. We separated quickly with both of us a bit stunned by what had just happened.
I spent the rest of the afternoon contemplating the joys of passionate, fulfilling sex with a willing and eager woman, something that had become a distant memory for me. My mind's eye repeatedly undressed Susan and visualized us fucking each other to multiple orgasms. I knew I was very likely overreacting, but I reveled in thinking about the extraordinary pleasures we could share.
We went to a cozy restaurant that evening, and our flirting spoke volumes although it was necessarily subtle due to my wife's presence. Susan was seated across from me, and during the meal she rubbed my leg under the table with her bare foot. It was a simple, suggestive act, and I found it very pleasing and highly erotic. I felt my cock becoming firm, and I liked it.
My wife left us to use the rest room, and I said to Susan, "I really enjoy flirting and our earlier time alone together was great, but I want to know how serious you are about us going further."
"I am serious, Mark. Honestly. I have strong feelings for you, and I want to act on them."
I replied, "Okay. I want that too. If it is going to happen before you leave, it will have to be tonight after Debbie goes to bed."
Susan was leaving the next day. Moreover, I am very much a "night person," and I usually stay-up long past the time Debbie retires. We could enjoy each other, quietly, in the privacy of my office.
I said, "Come to me in my office around 1:00 AM, and we will spend some quality time together." Susan did not have time to reply as Debbie was on her way back to our table. I presumed that her continuing to rub my leg was her unspoken "Yes."
Susan sleeps in a bedroom opposite the master bedroom and down a lengthy hall from my office. She puts her toiletries and cosmetics in a bathroom across from my office door, and numerous times in the past she got up to use the bathroom during the night while I was still working. We always exchanged eye contact and a smile as she went in and out. Her preferred sleepwear was an attractive, semi-sheer mid-thigh length nightgown, and each time she passed-by I checked her out as best I could with her full, heavy breasts and bikini panties being magnets for my stare.
The doors to both the master and Susan's bedrooms were closed at night during her visits to provide privacy. Considering that Debbie is a sound sleeper, the door to the master bedroom would be closed and the considerable distance down the hall to my office, I was confident that Susan and I could enjoy each other quietly enough to keep Debbie from being awakened by our play.
