MarkWallert
Male
| "What if this guy from the car pooling is a hottie?" | ||
"It would be cool. If so, I'll hide and you take him home." | ||
I bid you welcome to my book series "Aims to cause suffering – my life as a swinger, wife-sharer and cuckold."
With this works, I'm looking forward to taking all of you, who are interested, along on my erotic journey through my sexual life of the past twenty years. In this book series, I talk about my first steps as a swinger, my experiences as a wifesharer and my development into a cuckold.
Part 1 is now available on Amazon: https://www.amazon.de/dp/B0841P7FFJ/ref=cm_sw_em_r_mt_dp_U_dxXjEb8M5J94V
I will attach some pictures of the experiences described in the book….. and one story out of book number 2. Enjoy!!!
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It was in 2003. After my first swinger experiences with my first long-term-girlfriend Susanne, I met Vannessa. She was a dream of a girl: athletic, smart, saucy and very attractive. She had long blond hair, a perfect face and a body to melt. Her butt was extraordinary and her tits in perfect shape. I loved everything of her and somteimes wondered why she took me.
After approximately one year of relationship and our first steps in swinger lifestyle together, the following story took place in real:
I frequently looked at the pictures of Vanessa and me. Our collection consisted of numerous albums by now. My favorite photos among them were the ones that had been taken at the "Josefine's" when we had been alone there one evening. In the pictures, Vanessa was posing so sexy in her lingerie in the middle of all the leather couches on which we had fucked so often. The slutty ambience and the memory of all those thrilling evenings turned me on enormously. One evening, a couple in the erotic theater had invited two men from the area, which was open to all visitors, to the couples adult theater. They enjoyed themselves there as a foursome. In doing so, the partner of the woman remained discretely in the background most of the times, while his female companion had sex with the two strangers. That constellation had impressed me mightily. I looked at the photos of Vanessa in the erotic theater and imagined more and more frequently that we could also ask an unknown man to enter the area, which was reserved for couples, so that Vanessa could enjoy herself with him there. There they were again: my cuckolding fantasies. I felt a growing desire to share my girlfriend and to see her in the hands of strangers, and that feeling was stronger than ever before. I looked at the photos so often and thought of my fantasies that would probably come true at the "Josefine's".
Together with Vanessa, I had already gained experience in the field of swinging, which I hadn't experienced before. Nevertheless, my wish for experiencing further things in the field of swinging was becoming more and more dominant thenceforward. Particularly the imagination concerning a stranger in the couples adult theater was omnipresent now. And during our next visits to the "Josefine's", I thought of it with increasing frequency. I could barely focus my attention on anything else. I longed for watching Vanessa touching a stranger. However, every time when we went to Offenbach, I had a lack of courage to really go ahead with my plan. The men outside gave me the creeps. Furthermore, I didn't know either what Vanessa would say to it. At home, while looking at the pictures, I had always imagined things, but then I lacked of courage when we were at the place in question. And so, unfortunately, sharing her once with a stranger there remained my imagination for a long time.
After experiencing various additional flops with couples, we weren't in the mood anymore to waste our leisure time on private dates. Searching for a couple took a lot of time, because, as already mentioned, the community was still small in 2005, so that the choice was rather meager. Besides, Vanessa and I still didn't know exactly what we were looking for at that time. On the one hand, we were interested in a couple like Tim and Katharina, with whom we had spent such a great evening as a foursome. On the other hand, I was somehow more interested in seeing her with a single man by now. And thanks to the "Josefine's", we actually had our daily ration of sexual adventures. So, we didn't need further dates anymore. Vanessa and I still were in touch with several couples on Joyclub, but we contacted them very infrequently, and it didn't come to further meetings anymore from then on. Apart from chatting with couples now and then, we had also made the acquaintance of single men, of course, and we wrote to each other from time to time. It wasn't our intention to meet one of them, but we exchanged nice messages.
One Saturday, Vanessa and I went inline skating. It was a beautiful summer day, and we skated side by side along a path on the edge of the woods. I remember clearly where we had been and that I had been horny all day. Maybe it was the sun that stirred my hormones. Vanessa's tight shorts and her hot butt, which skated along right in front of my nose most of the times, certainly contributed to it. We enjoyed the weather and skated along the path, when I asked Vanessa bluntly without beating around the bush, "Darling, do we want to meet one of those boys from Joy?"
Vanessa looked at me with surprise, we continued skating, and she answered:
"Are you in the mood for it? What do you have in mind?"
She didn't seem to be averse to my suggestion. I saw my chance coming.
"I would like to see you with another man."
"And what about you?"
"I'll be present as well, but I only want to watch."
"Okay."
Okay? Wait a moment. Had Vanessa agreed to fuck a stranger just like that a moment ago? And I should watch them doing it? I almost toppled over in my inline skates. I immediately got a boner in my pants, I hadn't reckoned with her consent so quickly. Should I be in a sulk now? Was she probably longing herself for an unfamiliar dick? I was a bit confused. But I only wanted to do one thing now: skating home fast and fix a date. On our way back home, Vanessa and I almost didn't talk with each other. I don't know what she was thinking on our way back. For my part, I was terribly afraid that she could change her mind again and reconsider her decision. So, I rushed home particularly fast, deliberately wordlessly. I wanted to wrap the date up, before things could turn out differently. I was only horny all the way back to our place. I rushed home. I wanted that date so much, and I wanted to witness by all means how she would be fucked by another man.
When we finally arrived at home, I didn't waste any time and immediately sat down in front of the computer. I opened Joyclub and began to write messages to some of the guys we had gotten in touch with in the past few days. It didn't take long, until the first one answered. Sebastian was in his late twenties and lived in the house of his parents not far away. He had his own apartment in the attic there. I explained to him quickly what we were looking for: a young man who would fuck Vanessa right before my very eyes. I wanted to watch it only passively.
Sebastian was immediately thrilled. Not only that he would have the opportunity to fuck Vanessa, but he could also have her all to himself. His interest was aroused at once, and after exchanging a few more messages, he invited us to his place. So, we would have our first real cuckolding date on the very same evening. A man was supposed to sleep with my girlfriend, and I would only watch them and remain entirely passively at the same time. It was extremely spontaneously, so that there was little time left for nervousness or fear. I didn't have time for considering whether I did the right thing or not. I couldn't back down again anymore. In fact, we actually had to hurry up.
While I was preparing dinner, Vanessa took a shower. We were in a great hurry. I still remember that I wolfed down my dinner, because I didn't want to arrive too late at Sebastian's place, not under any circumstances. Everything was hectic and a bit chaotic. I was terribly excited. And then we were ready and started on our way. The trip didn't take long, but I already felt that my stomach began to grumble. Something was rebelling.
After parking close to the house, we actually stood in front of the door to the apartment of a stranger who should fuck Vanessa immediately, only a couple of hours after coming up with the idea of having a cuckolding date while we had been skating. It was unbelievable. Everything happened so fast, and I totally understood the scenario that had taken place only days later.
Sebastian's parents ran a bar with drinks and light snacks on their premises. It was in the backyard of the house and closed that evening. That was where Sebastian asked us to meet him for the first time. It was a pretty neutral place, and it seemed that he preferred to make the acquaintance of us there rather than right away in his own rooms. We knocked on the door, and a tall, slim man opened the door for us. Sebastian looked exactly as in his pictures; he was attractive, had blond hair and a mischievous grin on the face. He was wearing light blue jeans and a polo shirt. He introduced himself, shook hands with me and welcomed Vanessa with a kiss on her right and left cheek. We entered the bar. It was very dark inside. It smelled of a mixture of alcohol and old furniture. And it was exactly as the bar looked like as well. It had definitively seen better times and radiated the charm of an inn in the eighties. The three of us sat down at an old bar, and Sebastian explained to us that the bar had closed down a couple of months ago. For that reason, it seemed to be an ideal place for a first meeting. I agreed with him and looked around the honky-tonk. I saw numerous old wooden chairs, an abandoned bar and various paintings on the wall. In general, the interior looked like a bar as a bar had simply looked like thirty years ago. Time had taken its toll on everything, even though the furniture wasn't dirty or run down, but it was little inviting neither; the wood was dark, the decorations were ridiculous, and the seat covers were worn.
The three of us started a conversation, but only Vanessa and Sebastian talked most of the times, because I wanted to stay a bit in the background, after all. Furthermore, my stomach was still causing me trouble. Sebastian wanted to know, of course, whether we had such dates frequently, how long we had already been on Joyclub and what kind of hobbies we had. He sounded us out to some extent.
After making small talk for a little while, he suggested to continue the evening at his apartment. He obviously regarded us as likeable and honest people, so that we could enter his private rooms now. I was suddenly very nervous. Should all of my fantasies really become true now? My stomach began to rumble louder, my heart to beat faster and my mind to shut off. My palms were moist in a flash, and my pulse began to race. I had always wanted to be present and watch my partner getting intimate with a stranger. Ever since I had been in a relationship with Susi, that fantasy had kept running through my head. Now it seemed that nothing stood in the way of making my fantasy come true. But now I was gradually getting scared to play my own game. I really was in a state of agitation. Vanessa, however, was obviously relaxed. She smiled at the two of us and followed Sebastian in the direction of his private apartment.
When we walked in, the size of the apartment surprised me. Basically, it was only a slightly bigger room; there was a couch in the middle, and a TV, as well as a game console, in front of it. The bed was in a corner, and two wardrobes were in the other corner. There was no other furniture. Sebastian offered me to sit down on the couch. Vanessa sat down right on Sebastian's bed. I was dumbfounded. She had never experienced a cuckolding date before. Nevertheless, she behaved in such a relaxed and determined manner now, as if it was the most natural thing in the world, whereas I was torn inwardly. The whole scenario made me incredibly horny, but it also made me nervous and gave me the creeps. What would happen? It will certainly be awesome to see her together with Sebastian on the bed. But would it change anything between us? Is he probably better in bed than I am? Is our relationship at risk? Exactly such thoughts occur to every cuckold on the first few dates. There were concerns and fears. However, despite all those negative thoughts, which I couldn't dismiss, my lust and the things that were going on in front of me gained the upper hand. And my horniness made me forget all of my fears.
The very moment, however, when Sebastian joined Vanessa on the bed, I felt really nauseous. That was all too much for me. First, the hastily eaten dinner; then the time pressure, and now countless millions of feelings were pouring into my mind, turning my stomach into a volcano. I was seething on the inside: horniness, stress, jealousy, fear, dinner, love, heartache. It all was coming together now, and I felt that I had to go to the bathroom. I shouted to Vanessa and Sebastian that they should simply ignore me, I would return soon. I dashed quickly out of the room, down the stairs and back into the bar, where I disappeared quickly into the bathroom. As soon as I sat down on the floor, I had to ******* immediately. I was sitting in front of the toilet bowl, heaving up my complete dinner. Sitting on the floor did me good. I could finally calm down to some extent. Vanessa and Sebastian were in the back of my mind, of course. A little later, I was in a state of agitation again and wanted to return to them, because I didn't want to miss anything, after all. I remained sitting on the floor for a bit longer, so that I could regain my strength, before I washed my face with some water. And then I returned to Sebastian's apartment at a smart pace. I was just on my way upstairs, when I saw Vanessa approaching me.
"What's the matter with you?"
"I only ate too hastily, everything's fine. Let's go up again."
"Are you really okay? Shall we go home?"
"No, everything is perfect, really. I only had to go to the bathroom. Now I'm really fine again."
The two of us went back to Sebastian, and I also had to explain to him briefly one more time what had happened. I assured Vanessa and Sebastian that I was fit now and sat down on the couch once again. The mood was a slightly disturbed, of course. For that reason, I tried to look as normal as possible and to cover the incidence in the restroom, because I wanted that the show would begin, after all. Vanessa returned to Sebastian, and the two of them were lying on the bed in a tight embrace and kissing intimately within a few seconds. Watching them meant that a dream had come true. It was so shamelessly wicked when their mouths touched. It was so wrong but still so right at the same time. Sebastian's hand was already sliding under Vanessa's sweater. Then he began to massage her breasts. Once again, I was seething on the inside. This time, however, it wasn't due to my dinner. Thanks to my visit to the restroom, my stomach had improved considerably. Without any further concerns, I could watch the spectacle on the bed, which took place about ten feet away from me. Now my cuckolding feelings were driving me crazy. Sebastian's hand was exploring the tits of my girlfriend Vanessa. His tongue was sticking in her mouth. I had already dreamed of that moment so often. I had seen those pictures in my mind's eye a million times, and they had served frequently as spank bank. It had been my innermost desire for a very long time. And now it was coming true. It triggered a hurricane of emotions inside me. Seeing her with him so intimately was so painful. It was so daunting. It was dangerous, filthy, wicked, against all conventions. It tore my heart, made me sweat, tremble and boil with rage inwardly. It wore me out, caused me fears and worries. Keep watching them was a challenge. But the bottom line was mainly this: it was simply awesome. It was exactly what I had always wanted to experience. A little later, Vanessa was lying under Sebastian and let him caress her breasts. She let it happen. She looked completely relaxed. They kissed extendedly. In doing so, they rolled in bed to and fro again and again, and Sebastian felt her up incessantly. His big hands were on her pretty boobs most of the time, sometimes he caressed her belly, sometimes her back. And then his palms, which looked like digging shovels, wandered down between Vanessa's legs and moved up again. The two of them didn't deign to look at me and were indulged in kisses and caresses like lovers who were newly in love. They only had eyes for each other and looked uninhibited in bed. Vanessa opened Sebastian's pants and reached into it courageously. It seemed that she rubbed his hard dick only briefly, and then she began to remove his pants completely. In doing so, she knelt between the bottoms of his feet, pulling soulfully down his jeans, until she held the single piece of clothing in her hand. Sebastian was wearing tight, blue boxer shorts, which couldn't conceal that he liked what Vanessa was doing. It was clearly visible that he had gotten a boner. He turned around in bed, pulling Vanessa with him. Now he was lying with his rod on top of Vanessa. They kissed one more time. I didn't dare to avert my gaze anymore; I didn't want to miss any detail anymore. I watched Vanessa and Sebastian making love to each other, their lips touched and their tongues played with each other. Both had put a hand on each other's back of the head. Everything looked so intimate as if they were real lovers. It was so ******* for me, it hurt so brutally, but it was brutally wicked at the same time.
Now Sebastian began to undress Vanessa slowly. First, he removed her black and gray sweater. He pulled it over her head and threw it on the laminate. Her red bra followed immediately. He had opened it quickly and tossed it aside. It almost seemed that he threw Vanessa's clothes deliberately as far away as possible to provoke me. And it proved to be successful. I was getting incredibly horny. With every piece of clothes, I realized more and more that Sebastian had a hold on Vanessa and was well on the way to fuck her soon. All of that was so terribly painful and disturbing. It wore me out, but it turned me mega on at the same time. That mixture of positive and negative feelings drove me into a state of frenzy. I wasn't able to think anymore, I simply stared at the things which were offered to me in the bed in front of me and reacted. I opened my pants and pulled it down. I slipped off my boxer shorts, and then I was sitting with a bulging dick on Sebastian's couch. I couldn't help it. I had to pleasure myself. I didn't ponder what Sebastian or even Vanessa would probably think in respect thereof. In retrospect, I realized that the situation was pretty weird indeed. My girlfriend was lying on the bed with her tits exposed, and I was sitting several feet away from her, popping a boner. However, it wasn't the case that I walked over to my girlfriend to act out our lust together as would be expected. It was a stranger who could enjoy her exclusively, and I was damned to watch. So, I was sitting there in an unfamiliar apartment, watching a stranger having sex with my girlfriend; and I even liked it. Crazy. While I was jerking, I saw Sebastian kissing Vanessa's tits. He looked over at me from time to time, and I would have loved to know what he was thinking at that moment. Vanessa took no notice of me. She took off Sebastian's over garments and began to caress his chest. She kissed his buff upper body, and I could see that his dick pulsated simultaneously, because there were rhythmical twitches in Sebastian's boxer shorts. He was obviously hot for Vanessa. Who could blame him for that? As always, Vanessa looked incredibly hot. Her tits were firm, her belly was flat and her face was picture-perfect. And I had driven her in the arms of another man. Had I gone nuts? On the one hand, I wanted to put an end to all of that, but on the other hand, I wanted more. It was like a *******. I was attracted to their love play, even though I knew that it was dangerous. I was playing with fire. But I couldn't do without it anymore. I had become a cuckold a long time ago, and I only wanted to watch how this stranger would do it with Vanessa.
Vanessa seemed to have similar thoughts, because she had opened her pants herself by then. Sebastian helped her to remove and pull them over her slender legs. Now she was only wearing her thong and suspenders, as she was lying on Sebastian's bed. He had obviously not expected it, because when he saw Vanessa's nylons, he was flabbergasted. He caressed her legs extensively. It seems that he had a partiality for nylons, because he simply couldn't let go of them. He touched every spot on her thighs, her knees and shanks. In doing so, he frequently came suspiciously closer to her inner thighs and her pussy. Vanessa and he kissed again and again. Now she was sitting upright very close to him. She wrapped her legs around his hips. At the same time, Vanessa began to caress the back of his head. Sebastian continued running his hands over her legs. Gradually, but determinedly, his hands wandered slowly further up. His goal was clear–he wanted to touch Vanessa between her thighs. She freed herself from his embrace and opened her legs willingly. She let him do as he liked. To top it all off, she let herself fall backward and was lying with her back on his bed again. Sebastian could look right at her pussy. He reached behind Vanessa's thong and shoved two fingers into her pussy. She gave a moan. At this sight, my dig was as hard as stone, and I felt that I was already on the verge of getting off. I had to stop masturbating repeatedly to prevent that I would shoot my load too early.
Vanessa's thong flew in my direction, and Sebastian buried himself between her thighs. He had turned over onto his belly and had just put his tongue on her pussy when she already climaxed vigorously. It seemed that Vanessa's lust had accumulated to such an enormous extent that it erupted like a volcano when he touched her vagina for the first time. Sebastian used it as an opportunity to drive Vanessa further to her second orgasm now. His tongue wandered over her public mound, her labia, into her cleft and back again. Vanessa jerked and moaned. Her hands grasped Sebastian by the back of his head, pulling him deeper to her again and again. Her moans grew louder and louder. I jerked. It was a view that I haven't been able to get out of my head up to the present day. Vanessa let him lick her pussy completely shamelessly before my very eyes. She was lying there entirely naked in front of a stranger. Without the slightest qualm, she opened her legs wide for Sebastian. She enjoyed his caresses and allowed him to lick her from one orgasm to another, while I was sitting next to them, jerking. All of that was so outrageously sassy and wicked. I think that the fact that the own girlfriend has the audacity to get intimate with a stranger is the elementary thrill for every cuckold. For my part, that perception has held true to the present day. Watching a couple having sex is certainly mega wicked. Watching a pretty woman making love to someone is certainly erotic. And to listen to her moans is certainly arousing. But I think that the most decisive factor for a cuckold is that she does it at all. That she is really so shameless to fuck another man, that she has the audacity to cheat on her partner; that another man sees, feels and experiences what should actually be reserved for himself; that she is indecent and slutty; that she behaves unbecoming and has the nerve to cuckold the own life companion. I think that's the crucial point that a cuckold is driven by. His jealousy, anger and fear turns into lust, passion and desire. The very moment, when I was in Sebastian's room, I understood it very clearly for the first time. And I really enjoyed the moment, when I saw Vanessa with Sebastian, to the fullest. I kept rubbing my dick busily, and in doing so, Vanessa came one more time.
After her second orgasm, she whispered something into Sebastian's ear. The two of them darted a quick glance at me and smirked. And then Sebastian removed his boxer shorts. I don't have a clue what the two of them were talking about, but it seemed that it was about me and amounted to the fact that Sebastian would fuck her now. I was embarrassed and horny at the same time. I enjoyed sitting submissively in front of the two of them, having to masturbate, while watching them making love. Sebastian fetched a rubber from the nightstand and slipped it on. Vanessa opened her legs even a bit wider and smiled at Sebastian happily. Then he approached her pussy slowly and entered it very easily. Vanessa was obviously pretty wet, because Sebastian's rod disappeared completely into Vanessa. She closed her eyes, grabbed Sebastian by the back of his head and began to moan again. With every thrust, she got louder. He began to bang her slowly. His wand slid in and out. It was soaking wet and slipped again deep into my girlfriend without any problems. She was lying there and had forgotten everything around her long ago. She enjoyed Sebastian's thrusts. He fucked her gradually faster and faster. I kept jerking, and in doing so, I had to take breaks again and again. By a hairsbreadth, I nearly jerked off vigorously just this minute. But I wanted to protract my orgasm, didn't want my lust to abate. So, I held my tool firmly in my hand to quiet it to some extent. I watched the opposite happening right in front of me. Sebastian had gathered speed in the meantime, and so had Vanessa. Now the two of them were very loud. I was glad that Sebastian's parents weren't at home. His moans were getting increasingly louder now, and Vanessa's moans grew louder as well. They fucked for about three, maybe four minutes. Sebastian's face got redder and redder, Vanessa came once again, and he obviously shot his load eventually into the condom. He moved inside her slowly for a little while, until he lay down next to her with exhaustion. It was clearly visible that Vanessa's pussy was completely red. The two of them were lying happily and wordlessly next to each other. Once again, an emotional turmoil of jealousy and doubts surged up within me. However, before I could come to terms with the depressive mood on my part, something happened that changed my mind immediately: Vanessa got up from the bed and approached me. She took my dick in her hand and whispered into my ear, "It was so wicked. Thanks for that. I love you."
I could have started crying within a split second. Her words moved me to the core. I was happy and proud that she was my girlfriend. And I was relieved that I had gone through my first cuckolding experience with her. Painful and ******* feelings had rained down on me. However, I was the happiest man in the world a few moments later. I knew that this could be the beginning of a life as a cuckold.
The event with Sebastian was over extremely quickly. She hadn't even given him a blowjob. And his physical constitution didn't allow a second round either. Actually, Sebastian was a sexual flop. Nevertheless, the evening was a successful beginning for Vanessa and me. The relationship between me and her had really gathered speed after that adventure. After our first cuckolding experience, we were hotter for each other than ever. We lived on it for weeks and dreamt of more. Whenever we had sex from then on, we envisioned possible further scenarios and unfamiliar dicks that would take her, groups of men–typical cuckolding fantasies. We were young, wild and had only just begun. Vanessa had enjoyed our experience in the same manner as I had. We wanted to build up on it and to look for new horizons: I as a cuckold and she as a hotwife. Unfortunately, things turned out differently than expected, though. No matter how much Vanessa and our experiences turned me on, we began to drift more and more apart on a personal level by the end of 2005. The brighter the light, the deeper the shadow, and the shadow in question was undoubtedly Vanessa's difficult disposition. No matter what I did, I did it all wrong. And due to the fact that both our natures were dominant, we rubbed each other the wrong way.
Today, thirteen years later, I can assess the situation even better. Vanessa and I are still in touch with each other in these days. Whenever we meet, however, I realize that she is a difficult person. I like her, and I can deal with her negative and petulant nature by now. Being in a relationship with her, however, didn't work and would never work at all. Back then, her beautiful looks and the prospect of more erotic adventures prevented me from leaving her. But those two points can never be sufficient for building up a relationship, if the dispositions of two people are too different from each other. Consequently, we separated eventually and got together again a few weeks later. But then we separated once again and gave it another try shortly afterward. That on-off relationship went on for many months, yes, even considerably longer than a year. There were times when our friends didn't know the state of things anymore. Sometimes, we slept next to each other and with each other as well, of course, although we weren't a couple at all. We neither could live with nor without each other. And it was quite often the case that we even didn't know the current status of our relationship either. It was a terrible back and forth. On the one hand, in view of all those reproaches and fights, it couldn't go on like that anymore. On the other hand, I didn't want to lose that gorgeous woman. And I certainly didn't want to do without those erotic experiences, of course, not by any means. However, such adventures in the field of swinging, wife-sharing and cuckolding can only possible, if there is blind trust between the partners and the own relationship works perfectly. Relationships, which are in a crisis, are a conceivably unfavorable foundation when it comes to games that require trust and love as a fundamental basis. How should it be possible to turn jealousy into lust, if you are not happy with your partner? It will lead to further problems, resentment and mistrust. And so, due to the increasing problems in our relationship, Vanessa and I left our erotic games alone more and more frequently, until it came to a complete standstill in respect of erotic adventures. Even the visits to our favorite couples adult theater weren't a ritual any longer. We were simply lacking of energy for that, because we were too concerned with our own problems. It simply worked out less and less between Vanessa and me. We had fights almost every day. The peak was certainly reached during our vacation together in the Caribbean in 2007. We had another fight and separated again. I took her to the airport, and Vanessa left for home earlier than I did, alone. That incident put an allegoric end to us as a couple, and eventually, it also meant the end of our relationship for good.
If you liked my story and want to find out more about my development as a swinger, wifesharer and cuckold, just go on amazon and read my books:
https://www.amazon.de/dp/B0841P7FFJ/ref=cm_sw_em_r_mt_dp_U_dxXjEb8M5J94V
Yours Mark
