A few months ago I awoke with a massive hard on, rolled over to my wife who was sleeping on her back, and slid my fingers between her legs. Finding wetness, I thought I had it made and slid my two middle fingers into her. She immediately reacted by undulating her hips against my hand and sleepily moaned, "Oh God, You're here already." She soon increased her hip movements and came fully awake as her arms started to pull my head down for some serious kissing. With surprise in her eyes, she gasped as she realized it was me and not some dream lover fingering her, and closed her legs. Rising up, she said as she begged off having sex with me, "I was dreaming. It's late and I've got to get the kids their breakfast." Disappointed and still with a raging hard on, I wanked it in the loo as I got ready for work. When it was time to leave, she left the kids at breakfast and went with me to the front door. She looked delicious wearing her normal summer house wear, one of my T-shirts and her loose gym shorts. At the door, still feeling randy, I pulled her into a passionate embrace and felt her braless breasts under her T-shirt. She kissed me back and said, "Maybe tonight." I replied, "For sure", and left with a smile. My work sometimes brings me close to home during the day and around noontime I found I was within a few miles of home. Thinking that I could use my lunch hour much better getting a 'nooner' while the kids were at school, I swung by ours and had to park in the street as the local washer & dryer appliance service truck was sitting in the driveway. I inwardly groaned as this was the third time in as many weeks that she had to call them for something. Since I was already here, I might as well get some lunch and maybe a quickie in our bedroom while the service guy was working in the basement laundry room. I went in looking for her in the kitchen. She wasn't there, but the door to the basement was open, so I started down. Just as I was about to call out to her, I heard the unmistakable sounds of a woman being sexually manipulated. I heard her moaning and gasping like she would do as she approached climax. I quietly descended the rest of the stairs and peered around the open doorway into our large laundry room. They were standing next to the day bed we kept opposite the washer and dryer. Her shorts and panties were lying on the floor next to where they were standing with their bodies wrapped around each other. He was kissing her with his tongue down her throat and she was giving as good as she received. I always wondered what our deep, passionate kisses looked like and now I knew. As they kissed, his hand was up between her thighs with at least two fingers, maybe more, up her pussy, moving very rapidly in and out as he finger fucked her. Her hands were tightly gripping his shoulders for support as she approached her climax. I watched as she came. Her head rolled back and she loudly gasped out her climax, her hips rapidly jerking into his hand. He fingered her through a long noisy orgasm. When she was finished, she pulled him toward the bed and lay down on her back. He lowered his trousers and pants to his ankles and followed her, kneeling between her outspread and raised legs, then moved his upper body over her, holding himself up on outstretched arms. She acted desperate for his rather sizeable cock, a bit longer and thicker than mine, and guided it toward her gaping pussy entrance with her hand. He moved his hips forward a bit and she helped him in. As he pushed it in the first few inches, she gripped his upper arms with her hands and closed her eyes. He pulled back a bit, then pushed it fully up her in a single slow thrust. As it went in, she pushed her hips up and moaned loudly. I stood there watching with strong mixed feelings. I was angry at being cuckolded, but also fascinated to watch her being fucked by another man, a secret fantasy I'd had the last few years of our 12-year marriage. I also had a raging hard on. My lust won out in the end and I remained silent as I watched them fuck. He was stroking his cock into her slowly as he hovered above her on his arms and seemed in no hurry to move things along. She, on the other hand, had taken charge and was forcefully and rapidly undulating her hips up into his cock, fucking him harder than he was fucking her. It was interesting to see how desperate she was for another climax. Her moans had turned into loud groans as she worked herself along the path of delight, and he was content to let her lead. As I watched, she enthusiastically fucked him for several minutes, groaning and gasping passionately. But he continued to fuck her with slow almost lazy, but deep thrusts of his cock. She must have been getting off on the depth of his penetrations. Finally, her hip thrusts became almost violent as she reached for completion and she soon came with cries "Oh God, I'm coming! I'm coming! Your cock feels so good! I need your cock! Fuck me! Come in me! Come in meeee!" I saw her abdominal muscles wildly contracting, then spasm as her orgasm rolled over her. Just hearing her and seeing the violent jerking of her body was unbelievable. I couldn't remember her ever being that way under me and I became angry again, but controlled it as I continued watching, my cock harder than I thought possible. When she finally recovered from her climax, she resumed fucking him, undulating her hips with the same desperation as before. He had slowly fucked her through her climax and continued the same way now. She was soon on her way to another climax, again wildly undulating her hips under him. She interspersed her moans with urgings for him to fuck her harder and faster. He let her go another minute or two, then quickened his pace as he thrust into her harder. At the same time he lowered his upper body onto her, placed his hands under her shoulders, and he began pounding into her to the accompaniment of her groans of, "Fuck me! Fuck me hard! Make me come again!" I watched as he soon went into the short strokes, fucking her unmercifully, almost as he wanted to drive his cock through her body and out the other side. She suddenly screamed out her climax, her body shuddering violently under him. She gasped out, "I'm coming! God, it feels so good! Don't stop fucking me!" As she was urging him to continue fucking her, he came with a roar, shooting his cum into her with several short but violent hip thrusts, then collapsed on her. She continued coming for several seconds longer, gradually slowing as she finished. They lay there recovering, holding each other with him still atop her, slowly moving his cock in her. Then he slowly rolled off and lay next to her, and said after a few seconds, "I've got to go. This was in between calls and I can't take any more time." She rolled into him giving him a full body hug and a deep kiss, then rolled away so he could get up. As he did she said, "This was better than last week, and last week was fantastic! Let me know when for next week." He grinned as he answered, "For sure. Third time was the charm. Having you is the highlight of my week." It was obvious her adultery had started with that service call three weeks before. I wondered who initiated the seduction. If it wasn't her, she certainly was into it now. I quickly escaped up the stairs through the kitchen and waited down the hallway as she escorted him to the front door. They kissed there, each of them intimately caressing the other one. He slipped his hand up inside the loose leg of her shorts and started to finger her. She moaned her approval and I watched as he fingered to another small climax. At the finish, she said, "I don't want to let you go. I need some more fucking by that wonderful cock of yours." He squeezed her cunt through her shorts and replied, "Me too, but I've got to go." She gave him a last deep kiss as he left and headed for the kitchen. I quietly followed her and saw her disappear down the stairs to the basement. She heard me as I stepped into the laundry room behind her. She turned and was startled to see me, saying, "What are you doing here?" Leering at her with both anger and lust, I answered, "I just watched you fuck another man!" She visibly paled. I advanced on her grabbing her shoulders, and pulled her toward the bed. She was so shocked at being discovered, she offered no resistance. I sat her on the edge of the bed and pushed her onto her back. Before she could react, I reached under her bum and pulled her shorts and panties off together. I then swung her onto the bed lengthwise, opened her legs, and climbed between them. She knew what I was going to do, but was still so surprised at being discovered, she offered no resistance. Pushing down my trousers and pants to my ankles like her repairman lover, I rapidly mounted her, sliding my cock up her with one anger driven violent thrust. As I went up her, I felt his residual cum squish out of her around my cock. She silently lay under me with closed eyes as I began thrusting into her hard and deep. I was so angry at her, I fucked her violently, almost brutally. Due to being unbelievably horny from watching her being fucked by another man, I came all too soon, filling her with my cum. I stayed hard with lust and soon resumed fucking her, coming a second time. When she realized I was finished, she started to wrap her arms and legs around me, but I stopped her and instead got up and dressed. I was still angry and went up to the lounge where I sat thinking hard about her betrayal. The ironic thing was that I had recently had a fantasy of watching her being fucked by another man in a threesome. Within about a half hour my anger had cooled considerably and soon watched as she came into the lounge and sit opposite me. We looked at each other warily, then she spoke. The gist of our conversation on her part was that she was sorry for me being hurt by her infidelity, but she was not sorry she the need to go outside our marriage. She explained that the idea for doing so had been coming on for many months and she had gradually become obsessed by it, noticing and sexually fantasizing about other men until she acted on it three weeks previously when he had come to service the clothes washer. She admitted to seducing him by giving off that look that all men recognize when a woman is sexually available, then encouraging his advances. She continued with, "I think you enjoyed watching or you would have stopped us. Instead, your cock was rock hard and you fucked me afterward like when we were newlyweds. Am I right?" I nodded 'yes' and told her about my fantasy to watch her being fucked by another man and then joining in. We quickly came to the realization that we both wanted the same joint extramarital experience and we should have communicated that to each other. By this time, she had moved to sit next to me and we soon were kissing and intimately caressing each other. I brought hr to a small climax with my fingers, then fucked her on the floor, this time with her body wrapped around mine and our eyes open as we brought each other to a wonderful orgasm. Afterward, we talked and worked out the details of having men join us for threesomes. In the ensuing months since then, when she encounters a desirable man she lets him know she is available and, if he's agreeable, sets up the threesome at a convenient hotel or motel for a Friday night when we can get a babysitter for the kids. A very satisfying side effect to this has been that our sex life at home has improved considerably with us having sex in the morning or evening, sometimes both, several times a week, especially when our next Friday evening 'play time' approaches.