Science Affair
Copyright© 2025 by Anonymous
Chapter 24
Young Adult Sex Story: Chapter 24 - A high school boy starts a science project with his best friend that ends up changing their lives.
Caution: This Young Adult Sex Story contains strong sexual content, including mt/ft mt/Fa Consensual Incest Group Sex Orgy Anal Sex Oral Sex Safe Sex
The first day of school seemed very strange to me. I felt like a visitor, and there were so many young-looking kids in the halls that it seemed like we had been invaded. Kathy, Jim, and Tucker had taken over the LAN, so I had no reason to go to Annie’s room before class. I really missed her sexy flirting until my fourth period Computer Science class. She was fingering the pendant when I sat down, and she was trying not to look at me. As the class proceeded, she avoided calling on me, and I resisted raising my hand. This was going to be a hard class to concentrate in. That night in bed, we both laughed about how hard it was, and we vowed to keep our heads and treat each other as student and teacher. We weren’t fucking like student and teacher when Kathy got into bed with us. She was still lonely, even though she and Jim had fucked like bunnies after school when they were supposed to be studying.
We had frequent phone calls from Anita, Marta, Lila, and Greta over the first several weeks of school. All were doing well, and Marta informed me that she had her period. She and Anita would fly out the day her fertile times started and remain for four days, including a weekend. Annie and I talked it over, and we decided that I would take Anita and Marta to the cabin for the weekend, if the construction on the cabin allowed it. There just weren’t enough beds in the house, and Annie would feel better about the situation. I sensed some jealousy, and she admitted that it wasn’t fair that Marta could have my baby and she couldn’t. We talked it out and made love. Man, I loved her! Kathy stopped getting in bed with us after a week, and I started sleeping with Mom one night a week again. It was so sweet making love to her, and we both felt better because of it. Chuck continued spending the weekends at our house with Steph and Mom. Jim even got to stay over twice.
We had been in school 3 1/2 weeks when Anita and Marta arrived. I picked them up at the airport, and it was a sight rarely seen in our town. There they were; two sophisticated New Yorkers, dressed by designers, getting into my little car. They practically raped me on the way home. Marta insisted she fuck me first so she could get a full load of sperm. Annie and Kathy got only brief hugs and kisses before I was taken up to my room. Marta was so horny she had an orgasm just from me sucking her tits the way she loved. She didn’t want the full treatment and insisted I fuck her hard. I think I set a record for cumming fast. I had barely finished cumming when Anita rolled me on my back and sucked me till I was hard again. As soon as I was moderately hard, she was sitting on my cock and fucking me like a wild woman. She had several orgasms before I pushed her over and remounted Marta. I managed to give Marta a second load before I collapsed between them.
Afterward, we talked and they updated me on the events in their lives. We showered and dressed, then went downstairs. Mom, Chuck, Kathy, and Jim were there. Kisses and hugs were exchanged, and we went out to dinner at Karen Schmidt’s restaurant. Anita apologized for the abrupt trip to the bedroom at dinner, and everyone laughed. Marta slept with Annie and me that night. Annie was wonderful with her and seemed to want to make sure Marta received all of my sperm. I fucked Marta before school the next morning and after school. It was Friday, and I drove Marta and Anita up to the cabin that evening. That weekend, Marta was so full of cum she sloshed. I was pussy whipped when we got home Sunday night. Marta received another load before school Monday morning, and they flew home later that day.
Annie was glad to have me to herself that night, and we made some of the sweetest love ever. A month later, Marta and Anita were back. We went through the same routine, and I’d bet my cock was in Marta’s or Anita’s cunt half of my waking hours that weekend. Marta received all of the cum again. They were back again just before Thanksgiving, and we had to go to a hotel suite because the cabin was torn open for the construction. They arrived again the week before Christmas, and in bed that first day, Marta told me she was two months pregnant. She hadn’t told Emery yet, just so she would have an excuse to come see me. Anita chimed in that she had a steady man friend, but she hadn’t had him in the sack yet. She was playing the cautious game with him, and he seemed to be taking it well. I wished her well, and we all fucked like it was our last time together, as it probably was. Marta made the announcement to Mom and Annie that night, and Annie seemed as excited as Mom was.
School was out for Christmas, and my last semester was over. Annie and I would be moving to start college the first week of January. Anita and Marta stayed at our house for three more days, and I still managed to fuck them both most of the time. It was a tearful parting when I put them on the plane home. Marta promised to call and give us updates on the pregnancy, and Anita guaranteed Annie and me that she would visit us at school.
Christmas was special this time. Dinner at Grandma’s was extra special. Steph brought Chuck, and Annie met the family. Cousin Mel and April were pretty nice, and April seemed pretty adult. Afterward, Kathy whispered that April had a boyfriend.
As the holiday proceeded, it became evident that Mom was upset about Annie and me leaving. Kathy kept crying every time the subject came up. I met Annie’s mother as her boyfriend for the first time. We were both surprised that it was not a surprise to her mother. She had suspected it the first time she met me. She joked about how the rest of the family was going to take it, and she agreed that they didn’t need to know until we announced our engagement. That was a day I was dreading, not because of the engagement, but because of the Langleys and the Munsons.
New Year’s Eve was special too. We had a party, and the night was spent in wild fucking and tender reminiscing. We looked over all of the pictures and had a laugh viewing the videotape of Kathy yelling and swearing. Chuck had graduated too and was moving in with Steph. She was already planning their wedding and wanted to start decorating the baby’s room. Chuck just smiled through it all and gave her lots of hugs. When we sang “ Auld Lang Syne,” Mom and Kathy both cried.
Annie and I packed for two days after New Year’s with growing excitement. Kathy helped when she wasn’t crying or in bed with Jim. Mom surprised us when she gave us the deed to a condo near campus. She said it was an early wedding present. Annie cried, Mom cried, and that got me to crying too. Kathy was already in tears, so it was a pretty mournful day. The movers picked up Annie’s furniture from the warehouse, and two days later, we moved into our new home. Mom came with us and helped unpack for two days. She had a tear when she kissed us goodbye and drove home. That night was what we believed was the beginning of our married life together. We had a three-day honeymoon before Annie and I started classes.
I had a hard time getting used to the study grind. Thank God Annie was there to help! She would encourage me when I was discouraged, berate me when I was lazy, and fuck me when I was stressed. We fucked a lot. Her classes were fairly easy for her, but she had to study even more than I did. Mom and Kathy came to visit every other weekend and stayed overnight with us. I got tickets to the basketball home games when they were there, and we had fun. Kathy was doing very well in school, and Jim was doing even better. They were competing to be the top two in their class. Jim had started the process of being nominated to the Air Force Academy, and Kathy decided she was going to go to Colorado College so she could be near him. They said that Chuck and Steph were happy, and he was doing well in school. Mom went to stay with them whenever she got too horny. That remark from Kathy prompted Annie to have me sleep with Mom whenever they visited. Mom was still the second-best lover in my life.
Spring break came quickly. Mom rented a large beach house outside of Panama City, Florida, for us. Annie and I flew down and found Chuck and Steph already there. His spring break was four days earlier than ours. Anita arrived the evening after us, and it was a happy reunion. Anita was her usual bashful self, and she had me in bed about two minutes after she arrived. Man, she was horny! Afterward, she told me that her boyfriend had proposed, and she was considering marrying him. She laughed and said he proposed out of sexual frustration. She refused to fuck him until they were married. She brought out a sweet letter to me from Marta. The pregnancy was going well, and they were both happy. Marta said the sex was even better between her and Emery. Emery was learning to be a very patient lover, but she said he was only good for one orgasm a day.
“Maybe you should come for a visit to stimulate him?” Annie read the letter over my shoulder, and I explained about Emery getting excited on the boat when he watched me fuck Marta. Anita and Annie both chuckled about that. Marta was getting big and fretting about her weight, but she was doing the right things for the baby. Anita also told us that Greta had called to tell her that she had a border. The border was her 19-year-old second cousin, and she was trying to get him broken in. Evidently, he fucked like a rabbit and came even faster. Her husband had been indicted the day after the divorce was final. They had four cases of child molestation against him, and the prosecutor was trying him on each one separately. He was going to jail for a long time. The announcement had caused many problems for Willa/Amy at school, so Greta had sent her off to a private school in Massachusetts.
I looked at Anita and said, “Let me guess which school.” She grinned and nodded, saying it was the prep school she and Marta had attended. She visited Willa/Amy frequently, and she was doing well. Greta flew out to visit often, and Anita always met her when she was visiting Amy.
“Mike, darling,” Anita said with a wily smile, “the East Coast chapter of your harem invites you to visit them. We have been too long away from your skills.” I laughed and told her that school prevented any social visits for a long time. I was going to try and graduate in three years, and that left little time for anything else.
I looked at Annie and said softly, “When we get married, there will be no more social visits.” She smiled at me sweetly, and a tear formed in her eye. A moment later, she jumped on me, and I got the wildest kiss yet from her ever. The kiss led to other things, and Anita had to watch us make love for over an hour.
Afterward, Anita said dryly, “Annie, you don’t have to show off in front of me quite so much.” That brought a big laugh, and we all hugged in a sweaty pile.
Two days later, Lila arrived in a car alone. She had driven from Atlanta by herself and, to our surprise, it was with her parents’ permission! Mom, Kathy, and Jim arrived the next morning, and Lila disappeared into a bedroom with Kathy and Jim for two days. We only saw them when they were hungry or going to the bathroom. Kathy, Jim, Lila, and Anita all left on Sunday evening. Kathy was staying at Jim’s house until Mom got home. Chuck and Steph left Tuesday. Mom moved in with Annie and me for the next four days. We had wonderful sex and long days on the beach. It was a great vacation!
School resumed too soon, and it was back to the grind for Annie and me. My grades were pretty good, and it looked like I might be close to a 4.0 by the end of the semester, thanks to Annie. She was enjoying her classes, and we had a little time to socialize with a few of her classmates on weekends. After the initial shock of my being a freshman, they seemed to accept me, albeit on a diminished intellectual level.
Annie and I hosted a finals dinner party in early May, and Anita flew in for it. Anita flashed a diamond the size of a golf ball and said the wedding was set for August so we could attend ... She related how well Marta was doing and how big she was getting. She said it was pretty funny watching skinny Marta hoist her belly around. Her due date was in July, exactly nine months from the second day of her first trip to visit us. That was the day I kept her filled with cum at the cabin. In bed that night, Anita was insatiable, and afterward, she told us how horny she was getting. She was still celibate with her fiancé, and he seemed to have accepted the fact that they wouldn’t have sex until they were married. She said she was praying he wasn’t a dud in bed.
After finals, we had a five-day break until summer school started, and we went home. Annie visited her mother for two days, and I slept with Mom. Mom was wild the first night, and afterward, she told me that she got very lonesome at times and missed sex terribly. Chuck was too busy with his classes and Steph to be of much help. I asked about Jim, and Mom snorted, “Your sister isn’t going to share him with me. She is getting very jealous of other women around him.” That led me to have a long conversation with Kathy about Mom the next day. When the subject of Jim and Mom came up, she became almost belligerent. When I calmed her down, she told me that Jim had been suggesting they sleep with Mom when he was over, and Kathy didn’t like the way he got excited when he talked about it. I reminded her that he used to get very excited when he fucked Annie, and I was sure it was because of the novelty, not because he was in love with her. When I asked, Kathy assured me that Jim loved her, and they talked all of time about when they would get married. She told me about weddings at the Academy chapel when he got his commission and how romantic it would be. I got her back to the subject of him fucking Mom, and she got agitated again. I talked about how she and I slept with Mom, and she never got jealous, but with Jim, she did.
“Why is that?” I asked quietly. She finally admitted that she was upset when he got so excited, as if Mom was sexier than she was. I laughed and said Mom was certainly sexy, and I loved having sex with her, but Annie was my love. I told her that I got hard sometimes just thinking about fucking Mom while Annie was in bed with me.
“So, do you get hard thinking about fucking me?” she asked with a warning look. I grinned and told her that I often daydreamed about the first time we fucked, and to prove it, I pointed at my hardening cock.
“Oh Mike, I love you so!” She fell on me, and we kissed for a long time. It didn’t take long before we were naked and making love like we used to. She was more in control than she used to be, and it lasted a long time. She had multiple orgasms accompanied by her screaming and swearing until I finally came in, yelling like old. Afterward, she called Jim and told him she was going to spend the day with me and would see him tomorrow. She told him she loved him, and after she hung up, she snuggled up to me. We spent the day in bed and were there when Mom got home. She looked in on us with surprise, and Kathy beckoned her over to talk. When Mom got close, Kathy winked at me, and we jumped on Mom. She was shrieking and laughing as we got her clothes off and began kissing her tits. It wasn’t long before I was fucking Mom to several orgasms, and then with aching, hard cock, I fucked Kathy. That night, we ate delivery pizza in bed.
The next day was Saturday, and after Kathy returned early with Jim, they went straight up to Mom’s room. When Annie got home, I explained what had happened, and she smiled, then giving me a hard look, she began stripping, telling me she was very horny and needed my cock. We fucked right there on the floor in the kitchen. Afterward, we went up to my room and took our time. When Mom finally got out of bed with Jim and Kathy, we called Steph and Chuck to go up to the cabin. I hadn’t been there since Marta and Anita’s visit last November. We picked them up and arrived in time to make dinner. There was no wind, so it was no use taking the Love Boat out. The addition, off the left of the great room, was beautiful. Mom’s new room had a beautiful view of the lake, and it had its own fireplace that backed up to the one in the great room. It matched the original fireplace, and I couldn’t tell what stones were new. Her bathroom was wonderful. The shower was big enough for at least four, and she had a big Jacuzzi tub. The dressing room had a hide-a-bed couch and was as big as her old bedroom above the great room. Mom and I went out to the new boathouse, and it was just like our original design. The Love Boat was up on rollers, and it was easy to roll it in or out of the water. I felt bad that it was all so nice and I hadn’t been there all year. Mom hugged me and assured me that it would be here when I graduated. We sat on the dock and talked for a long time. She assured me that she wasn’t getting too lonesome, and the business was running just like she wanted. I talked about my major, and I had decided that I was going to go for a civil engineering degree and Professional Engineer certification. I wanted to come home and work for her in the business and maybe expand into some other types of construction. Mom encouraged me to specialize in structural engineering, as it was one of her biggest direct expenses. She said she was always at the mercy of the engineering firms, and she was never sure the designs were either good or cost-effective. They certainly weren’t timely, since they catered to their larger clients. We talked about Chuck coming into the business, and he seemed to be headed toward either construction engineering or going on to become an architect. Mom told me that she and Annie were discussing the early stages of designing a construction management package for the Internet, and Annie was going to do her research paper on it. We were still talking when Annie came out and told us to come in for dinner. Mom apologized for not helping, and Annie pooh-poohed her. Dinner was steak, salad, and four bottles of wine. Everyone was mellow after that, and we sat out on the deck as it got dark and enjoyed the warm evening. Even the mosquitoes cooperated, and we only lit one bug torch. We talked about school, events around town, and news from Anita, Marta, Lila, and Greta.
Kathy brought us up to date on Lila. She was coming for two weeks in June. Jim wasn’t going to work for Mom until Lila left. Kathy, Jim, and Lila would probably be at the cabin most of the time. Kathy promised that she would bring her to see Annie and me for a weekend.
Mom said Anita was heavily into her wedding plans and trying to keep her sexual frustration in check. We all had a laugh over that. Greta was settled in with her boarder and seemed pretty happy. Amy liked her school and was in Europe for a summer French class. Marta was getting too big to do anything and was moaning about how uncomfortable she was. I expressed concern, and Mom assured me she was fine, just getting very pregnant. We all agreed to pitch in on a baby gift, and Mom said she would call Anita for ideas. As the conversation wound down, Kathy stood and pulled Jim to his feet. They both went to Mom, and after pulling her to her feet, they went in. A minute later, the light in Mom’s room came on. Annie gave me a raised eyebrow, and I nodded. Steph asked what was up, and I explained about the talk I had with Kathy. She pondered that for a moment and offered a concern: “Linda, you will be alone when Kathy goes off to school next year. We need to find her a man.” I agreed with her, and we discussed possibilities. We all came up short on ideas, but we agreed to keep in touch if we found a possible match for her.
I talked to Chuck about my conversation with Mom, and he told me that it was a good idea. He was going to work for her starting Monday, and that brought up the subject of last summer. We had many laughs, and I finally realized we had been talking for hours and we hadn’t had any sex. When I mentioned it, Annie laughed and said, “You and Chuck are getting too old for sex. Steph and I are going to have to get a couple of 16-year-old studs to keep us satisfied.” Steph agreed with her, and that started it. Chuck nodded at me with an evil grin, and we pounced on them. They were kicking and screaming as we hoisted them over our shoulders and carried them up to the bed on the mezzanine. We flopped them down side-by-side and sat on their stomachs, holding their arms over their heads.
They were both laughing and squirming to get loose when I yelled, “Who is getting too old?”
Annie yelled, “Mike and Chuck are too old for fucking!” She repeated it. Steph picked it up, and they began chanting it. Annie had on a T-shirt, so I moved her wrists together and held them with one hand and told Chuck to hold both of them. He held Steph’s wrists with one hand and Annie’s with the other. Then I quickly tore the collar of her T-shirt loose and then ripped the body of the shirt down the middle, exposing her glorious tits. She was shrieking and trying to get loose from Chuck’s grip through all that. Steph had on a halter-top, and I simply pulled it up over her tits and pinched her nipple firmly. She shrieked and tried hard to get out of Chuck’s grip.
“Who is getting too old?” I yelled. They took up the chant again. I scooted down to Annie’s thighs and had a bit of a struggle ripping her gym shorts apart, and then I tore her panties off. She was shrieking, but still chanting when I took over, holding their arms as Chuck ripped Steph’s shorts off. I was surprised that Steph had shaved her pussy bald. The process of wrestling with them was getting irksome, so I rolled Annie onto her stomach and, picking her up around the waist, I dropped her across Steph’s tits as Chuck released Steph’s arms. It was pretty funny hearing Steph go “ooomph” from Annie’s weight. Now Chuck could hold them both as I stood up and stripped, then I laid across them both as Chuck stripped. While this was going on, they were making an incredible racket and kicking. I pushed a knee between Annie’s and soon I had levered her legs apart as I kneeled between them. Her cute butt was up for easy access, and I simply pressed my semi-hard cock against her exposed pussy. Her pussy was slick, and the head of my cock popped into her cunt. She really shrieked and began taunting me with the chant as I worked my cock into her cunt. Chuck was watching me, and when I was almost all the way in, I told him to put it in Steph. He had a hard time because of the angle created by Annie on top of Steph’s chest. I managed to get a pillow, and he levered Steph’s butt up by lifting her thigh, and he slid the pillow under her ass. That helped, and he managed to get in her. They were still chanting as we began fucking them steadily. Annie’s weight was getting to Steph, so Chuck and I allowed Annie up on her elbows. Her tits were still against Steph, but the weight was off her. Chuck and I matched our thrusts, and the chants began to weaken after a while. Annie was the first to moan and stop chanting. Steph soon followed. Annie began rocking back to meet my thrust, and Steph wrapped her legs around Chuck’s hips. I could sense when Annie was getting close, and I signaled to Chuck to stop. On my cue, we both stopped. Annie groaned, and Steph whimpered.
I asked, “Who is getting too old to fuck?”
Annie muttered, and Steph shouted the chant until Annie picked it up. I signaled to Chuck, asking if he would like to switch, and he grinned. In a moment, I pulled out of Annie and he from Steph. They both stopped the chant for a second, and in a flash, we changed. He was into Annie easily, and she gasped when he bottomed in her. I had a little trouble getting into Steph. Her cunt was still very tight. Gradually, I eased in, and I fucked her slowly for several minutes until she began meeting my thrusts. She was sweating, and I could see Annie’s tits sliding over Steph’s as Annie rocked back into Chuck’s thrusts, their sweat mingling. They were forgetting their chant, so I signaled Chuck to stop, and as they both groaned, I loudly asked, “Who is too old to fuck?” They both paused for a moment, so I pulled all of the way out of Steph, and Chuck did the same to Annie.
“Oh God, don’t stop now!” Annie moaned. I repeated the question.
There was another pause, and Steph yelled, “For God’s sake, Mike, put it back in me!” I laughed and rubbed the head of my cock against the opening to her cunt. Chuck did the same to Annie. She pushed back, trying to get him to reenter, but he just squatted back on his heels and held her butt away.
“OK! OK! You guys are studs! Now please fuck me!” Annie yelled. I grinned at Chuck and told him to wait. Annie began to moan, and I had an idea. I pushed Chuck back further and picked up her nearest leg as I picked up Steph’s leg on my right and raised them up. As I lifted them, they began to hang head down at an angle, and I put those legs over my shoulders, then straddled their lower legs with mine. They were forced to face each other on their sides, and my cock was pointing at two cunts that were sideways to me. I was able to thrust forward, and my cock slid into Annie. She quit protesting and moaned. I pulled out of her and pushed into Steph. She groaned deeply. This was fun! I set up a sort of rhythm, giving Annie a stroke, then Steph. It was slow and certainly caused interruptions, but I was enjoying feeling two different cunts on alternate strokes. I don’t think it was too comfortable for them, almost standing on their heads, and their legs split wide, but they weren’t protesting much. They were holding each other’s waist as I fucked them, and their tits were pressed to the other. Annie groaned as I pulled out of her and whimpered, “This is going to take all day. For God’s sake, Mike, please fuck me!” I just told her to hold on as I pushed into Steph. I continued like that for several minutes, and a frustrated Chuck moved around to kneel above their heads and push his cock down between their noses. They quieted down as they licked his cock. I changed to giving each of them two strokes, and they responded a bit with moans. Very slowly, Annie got closer to an orgasm, and she began clutching Steph’s back when I was fucking her. Steph was further away from hers. Steph recognized what was happening to Annie and began stroking and pulling Annie’s nipple. I moved up to three strokes each, and Annie gradually reached her orgasm. Her cunt began nipping my cock, and when I pulled out of her after three strokes, she sobbed and thrust her pelvis at Steph. I gave Steph her three strokes, and when I pushed into Annie, her orgasm resumed on the second stroke. Thus, it went on for several minutes as I pushed Annie in and out of her orgasm. She wasn’t having real intense ones, but they seemed to be at a mid-level that she was able to maintain. Steph finally began approaching hers, and she was sobbing as I fucked her. I was getting tired of holding them both up, so I motioned for Chuck to move around beside me. When I pulled out of Steph, I dropped her leg off my shoulder. He dropped between her legs and began fucking her. I maneuvered Annie onto her back, and when I pushed into her, she slammed her cunt up at me with a big sob. The slow stuff was over. She wanted it badly, and I began fucking her hard. She was wild as she met my thrusts, and her cunt was grabbing me on every thrust. When my cum finally started, I was lost in a fog of yelling, sweating, and slamming cock into a clutching cunt. It seemed kind of funny that as we both recovered, Chuck was still fucking Steph steadily. The guy was amazing!
We got to go sailing on Sunday, and we promised each other to take more weekend breaks and come back to the cabin. We went back to summer school, and I finished up my freshman math courses while Annie started her master’s research project. The 4th of July break was almost two weeks long, and when we arrived at Mom’s, Anita was there. I received a very hot kiss, and she announced that this was her last fling before the wedding. Once again, she was so horny; all I had to do was give her a hard cock, and she did the fucking. When we were recovering from the first wild fuck, she was lying on top of me and mentioned casually that she was thinking of having a baby soon. I looked her in the eyes and guardedly asked, “How soon?”
“Maybe today,” she giggled. I was incredulous and asked how she would explain it to her fiancé.
“I may give in to the poor man’s predicament and my desires when I get back. So your job, big boy, is to fill me up this week. I want to be a mother by April 4th. So, think you can give me another load of sperm soon?” I shivered and made her promise not to tell Mom or Annie. Marta’s pregnancy was a big enough problem for Mom. I didn’t need another. We managed another load of sperm before we showered, dressed, and went downstairs for dinner.
Over dinner, Anita told us that Greta had been out to visit when she picked her daughter up from school and they left for a summer vacation in Europe. Greta’s live-in boarder was turning into a pretty satisfactory lover, but she didn’t want her daughter to know, so they were spending most of the summer traveling. Marta was getting very restless and was very anxious to have her baby. She was due in a couple of weeks.