When I returned home from the conference, Helen was already gone but Sandy described in detail the wonderful time that they had had. They had been close before, but the intense sexual activity had drawn them much closer, as would be expected. It was clearly three days of intense bonding. It was fascinating to hear all of Sandy's report, but the most surprising thing of to me was the total lack of sex in Helen's marriage. I found it hard to believe, particularly when Sandy talked about Richard's use of groupies when someone as pretty and sexy as Helen was his wife. However, the one thing that she did not include in her description of Helen and Richard's marriage was the question of Helen becoming pregnant and the impending test of his intentions. As she explained later, she wanted to see how that played out before we discussed it.
As I said, the three days were a time of closeness, but it turned out that there was one element of the bonding between Sandy and Helen that astounded me when I heard of it. This obviously was not new and had occurred over the months since Helen started visiting us, but it was a total surprise to me - and not a pleasant one. It was a couple of weeks after I got back. Richard was on a long flight and layover and Helen was returning for another visit. We had had a problem with the jets on the Jacuzzi and I casually commented that I had better get it fixed before she arrived. Sandy's replay astounded me. "Don't worry about it for now. We'll be having our periods about that time.
My response, on a topic which men tend to avoid, was, "Damn it, what lousy timing - wait a minute, 'our' periods! When did this become a joint thing? Do you plan it together?"
"No, dear, we don't plan it, it just happens. I know that you ignore that subject, but Helen and I have matched for the last two cycles - what's the term? Oh yes, 'menstrual synchrony.' Women who live together tend to have their periods at the same time. Helen and I matched to the day after two months in Spain, and we picked right up after she started coming here regularly. Apparently we are together enough to trigger the synchronization. It's not a planned joint activity, it just happens. Sorry about that!"
Men tend to be disgruntled when informed that the most significant part of a woman's anatomy will be "out of order" even if they understand the physical process causing it. In my case, it was particularly annoying because it seems reasonable to believe that if you have two women, they should stagger the "events" so that one is always available! Saying that "it just happens" doesn't make it fair! Note: I make no claim to being logical about this!
After saying all that, however, I have to admit that it all turned out pretty well in this case - their cunts were unavailable, but their hands and mouths still worked. I ended up naked in bed with two very attractive, semi-nude women, one on each side, one playing with my very hard cock and the other fondling my balls. It was a situation much to be desired, two mouths and four hands at my service!
Probably the most surprising experience of that time together was hearing my wife giving instructions on how I liked my equipment worked on. She demonstrated how to stroke the shaft and gave detailed instructions on how to handle the balls. It was amusing and, at the same time, exciting, as I listened to her almost giving a lecture, for I had no idea as to how well she had studied me. This was particularly true when she gave a practical demonstration.
She was working her hand up and down on my cock with her right hand while massaging my balls with her left. I was concentrating on the sensation, approaching the critical point when I heard her instruct Helen, "See, as he gets closer, the balls tighten up. When they are loose, they are very tender and must be handled very carefully and, sometimes, that's all he wants. But as they tighten, they are much less sensitive and they can be squeezed and slapped and he likes that. You'll learn with experience. Normally when Mack's balls are really tight, he likes them slapped hard and, if he lifts up toward your hand, you can really smack them. You have to watch his reaction, and, rarely, if he holds them up high, like he is now, really slap them. At that point, he will be ready to erupt, so take the cock in your mouth and gently suck and swallow."
I erupted and she swallowed. She was giving up the secrets she had learned over the years, cues that I gave without realizing it. I really was surprised, hearing how carefully she had studied my reactions, but I realized that I had done much the same thing with her - knowing just what to do and when to do it to maximize her pleasure. Still, it was touching to hear. It was also evident that she expected Helen to be a real part of our love making and that she clearly welcomed her. She was actually giving lessons!
It was a pleasant two days with two women taking turns working on me. I reciprocated by kissing tits and sucking nipples and the two women did the same, but I was the center of attention. Sandy demonstrated how to perform felatio, her head bobbing up and down while playing with by balls, again swallowing when I exploded in her mouth. When alone, we didn't do a whole lot of that, but the threesome somehow made it more exciting. That certainly was true when Helen proved that she had learned the lesson and, for the first time, had a cock come in her mouth and she tasted male cum. She instinctively pulled back a bit when I came, but resolutely stayed there until the last drop went down her throat. It was, of course, a major step for her.
Another such step took place the following afternoon. Contrary to what this account of our sexual activities might suggest, we did have classes to be taught and administrative duties to carry out, so we weren't involved in sex the entire time. On that second day, I once again got home before Sandy and was greeted by Helen with a very loving kiss. She hugged me and asked, "Would you be interested in doing something before Sandy comes home?"
Not too surprisingly, I thought that was a very good idea. Shortly afterwards, I was nude on the bed and a bare breasted - well, "maiden" is the wrong word, but you know what I mean - was sitting beside me, grasping my cock and industriously working it up and down. Her other hand, as instructed by my wife, was massaging my balls. Happily, she had learned the lesson and her handling of the balls became more aggressive as my arousal mounted. She seemed to know, without real experience, when was the right time to start slapping them. The whole situation was such that whatever restraint I might have had over my emotions vanished and I just began surging upwards as I approached orgasm. At just the right moment, just before my climax, she brought her hand back and hit my balls hard and took my cock in her mouth just as I came. I think that my hips were six inches off the bed, my cock driving forward into her mouth in one of the biggest orgasms I can remember.
I collapsed backwards on the bed as she kept my cock between her lips as it softened in her mouth. At that moment, we heard Sandy come in downstairs and, as she had last time, she called out, "Where is everybody?" This time the answer was different.
"We're up here in the bedroom! Come on up!"
"What a scene to come home to! My sister, half naked, on the bed with my completely naked husband, obviously engaged in some depraved act!"
Helen replied, "We're not engaged in any such act! We just finished! Now I'm waiting to find out if I learned the lesson you taught me!"
