Note: This story was dynamically reformatted for online reading convenience. My son's girlfriend is pregnant and we don't know who the father is. It could be him...or it could be me. Jeff had been going with Becky for almost a year, since they started at the local college. He was a football player and she was a cheerleader, so I guess it was inevitable. I had had all those talks with him and I knew that Becky was his first. On his sixteenth birthday I had given him a box of condoms and for the rest of high school it had gone unopened. He brought her over for dinner and I could sure see what he saw in her. She was about 5' 5", slender but with a pair of tits that were about five sizes too big for her body. She made nice with her boyfriend's father and became a fixture at our home. One day I came home early from work and heard the unmistakable sounds of two people wildly fucking. I crept upstairs and stood in the hall outsider Jeff's bedroom. They were on his bed, her on her back and my son pounding into her. His young hairless ass was contracting as he drove himself into his hot young girlfriend. I could see her huge tits flopping around from his thrusts. Her legs were in the air and she was humping her ass off the bed with wild abandon as my son fucked her. I quietly retreated and let the kids have their fun. A couple of minutes later I heard the door open and close and assumed they were going out. Jeff came into the kitchen where I was and was startled to see me. "Hey, Dad." "Hey, Jeff. I guess you aren't a virgin anymore, huh?" He turned twelve shades of red, but I assured him all was good. The next week Jeff was off to a football camp. I was puttering around the house when I heard a knock at the door. It was Becky. "Hello," she said. "Jeff said I could come over and use your pool. Is that okay?" "Sure, Becky. Come on in." She retreated to the bathroom and came back wearing the skimpiest bikini I had ever seen. The small triangles of material barely covered her large tits, and I could see little curls of pubic hair coming out the sides. She gave me a smile and went out to the back. About fifteen minutes later I walked out back and there she was, lying on a lounge chair, topless. Her huge jigs spilled off to the sides and her large brown nipples were puckered and erect. My cock grew quickly in my shorts. I must have made a noise because she opened her eyes and looked over at me. "Like what you see?" "Ye...yesss." I stuttered. "So does your son. By the look of that tent in your shorts, someone wants to come out and play." She got up and walked over to me and put her arms around me. Nature took over and I reached up to fondle her globes of flesh. "Jeff was okay for a first-timer, but I like older guys." "Smart lady." "Shall we go inside or do you want to fuck me out here in front of the neighbors?" In a flash we were in my bedroom and this eighteen year-old slut had pulled down my shorts and was taking my cock in her mouth. I was wet and ready she laid back on my bed and spread her legs. Her pussy was gorgeous, all pink and wet and framed with a bush of dark blonde curls. She pointed to it and I got between her legs and went to work on her muff. With tongue and fingers I made love to her hot box. Her hands clenched around my head, driving it into her. By the time she had come three times my face was covered in her juices. She screamed as I brought her to an orgasm, her pussy slapping at my face as she thrust her hips up to meet my tongue. "Come on up and give Becky a good fuck!" Not needing further invitation I got on top of her and eased my erect penis into her steaming young hole. She let out a grunt as I got it all of the way up into her, mashing my groin against hers. The look on her face was unbelieveable, a contortion of pure pleasure and a mask of undiluted lust. "That's it. Fuck me hard!" With each stroke I pulled out more and more and pounded slowly back in. She was babbling incoherently at this point, her head just going from side to side. I could barely make out what she was saying. "So good, so fucking good, please don't stop." I began to move faster now, my own orgasm getting very close. She was starting to scream "faster, harder" and I obliged. I was pounding that fresh teenage pussy for all I was worth. Becky wrapped her legs as far as she could around my back, pulling me as deep as I could go. She raised her ass off the bed to meet every thrust and suddenly let out a scream that could have shattered glass. That young, tight teenage pussy clamped around my member as she came, and that sent me over the edge. I let out a yell and emptied my seed deep into her. It felt like I shot out a gallon of cum. Squirt after squirt went into her. The cum was oozing out around my cock and onto the sheets as I slowly pulled out. My cock was slowly shrinking as I lay down on the bed and pulled Becky to me. All that week she came over every day after school and we sucked and fucked long into the night. We fucked in every room, even Jeff's. To took her bending over the counter in the kitchen, it the hot tub, in the poolhouse. The hottest moment was when I took her ass cherry as she sat on the hood of my brand new Jaguar. Where she told her parents she was going I never knew. When Jeff got back from camp we had to sneak around a little but almost every afternoon he had football practice and that was our time to fuck. On several days we would screw ourselves silly in the afternoon, she would then leave and come over later for dinner and fuck Jeff's brains out at night. He never caught on that his girlfriend's pussy was extra juicy because his father was depositing his sperm in her before his son fucked her. Becky told me that my son was improving as a lover, but was still not in the same league as his dad. She said his cock was almost as big as mine but, being younger, he recovered much more quickly. He was mastering eating her pussy and was up to lasting over ten minutes of hard fucking before he came. This went on for a couple on months until Becky turned up at my door in the middle of the morning. She had cut classes to come see me. I opened the door and she was carrying a small package. "I have to go to the bathroom," she said. Get naked and meet me in bed. I did as she asked and, twenty minutes later she came to me, fully clothed and carrying something in her hand. She threw it onto the bed. It was a pregnancy test strip and it had two pink lines. She got on the bed with me and started crying. All this time I had assumed she was taking precautions. That's what happens when you're out of the dating scene for so long. "whose is it?" I asked once she had calmed down. "I don't know, yours or Jeff's. I am either carrying your child or grandchild." "Are you going to keep it?" "Yes. I have to." "I don't know what to say." "You don't have to say anything. But what are we going to tell Jeff?" That was a tough one. I had betrayed my son in the worst way a man can betray another man. All sorts of thoughts swelled through my head when I looked own and saw Becky's hand gripping my penis. We made slow, sweet love that day and I deposited four loads of sperm into her already impregnated womb. She didn't bother to leave this time, we just waited for Jeff together. When he got home we were sitting in the living room. He put down his book bag and came to see us. Immediately he sensed something was wrong. "Sit down, Jeff. We need to talk." We told him about how we had been together since he was away at football camp and that Becky was now pregnant by one of us. He was shocked, as could be expected but didn't seem to be too angry. "So what are we going to do?" he asked. We spent all night hashing over plans and priorities. Both kids wanted to go to college. Neither wanted Becky to get an abortion. We finally came up with a unique situation and solution. We all agreed that a paternity test wasn't important, that the child would be raised as theirs. I would pay to send them to school and arrange for daycare for our child. The kids would get married but both of us would continue to share Becky as our common wife. Becky took to motherhood and loved the feeling of being pregnant. Over the next ten years she bore five more children. Each of them looks like Jeff and I. And we really aren't sure who fathered which child. And we really don't care. We all love them equally and have a happy, though unique, family.