Science Affair
Copyright© 2025 by Anonymous
Chapter 20
Young Adult Sex Story: Chapter 20 - 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
Tuesday, before the prom, I called Trina and Maryanne to confirm the times and set the itinerary. Annie advised me to get their dress colors for corsages and to ask what type they wanted. Trina was as sweet as she could be and told me her dress was deep red and she wanted a wrist corsage in white. She laughed when she said the dress had no place to pin a shoulder corsage. I would pick her up for dinner at 6:00. Maryanne was bubbly when I talked to her and she also wanted a wrist corsage, mostly white with a little blue. Her dress was navy blue. I made the dinner reservation at Karen Schmidt’s restaurant. Kathy and Chuck would have dinner with us. I felt I needed support. Trina asked me what I was going to wear to the prom, while I was eating lunch, the next day. I told her I had a black tuxedo. She smiled and blew me a kiss as she walked away, her great ass swinging in a tight mini-skirt. I had a lot of incredulous stares from my fellow students. That night, Kathy said she had received lots of questions about who I was going to the prom with. Several had asked if it was Trina. She said she just smiled and said they would have to wait and see.
That Saturday, I went for my workout, picked up the corsages, and got a haircut. I was pretty excited about the evening and Annie told me she was going to fuck me hard before I left, hoping I would have a limp cock for Trina. Sure enough, I was in the shower when Annie got in with me. It was a hard and fast fuck. She seemed almost as excited as I was. We cuddled afterward and she assured me she was all right with me going out. I told her that I wished I were as sure. She said her big regret was that she wasn’t my date. I concurred with that sentiment.
I borrowed Steph’s big Lincoln and drove to pick up Maryanne. It was a beautiful spring evening, and her mother answered the door. I got a hug and soft kiss on the lips from Mrs. Langley at the door. I asked how she was, and she smiled as she squeezed my hand. “We are doing much better, Mike. Thank you for asking.” I received the obligatory complement about how nice I looked, and she led me into the living room. She introduced me to her husband, a handsome silver-haired man that looked quite a bit older than her. He asked me where I was going to college and about my family, then he went back to his paper. Mrs. Langley took me to the foot of the stairs and held my hand as she asked how I was. I assured her I was fine and looking forward to school being out. She was sincere when she wished me the best. Maryanne made her entrance a minute later, and she looked spectacular. Her dress was navy-blue underneath at least a hundred vertical rows of silver bugle beads. The effect was to make her already tall figure even more so. It was a tight sheath, slit up to the middle of her thigh, low-cut, with silver straps over her shoulders and crossing the exposed tops of her tits. She wore very high heels and diamonds on her ears, which highlighted her sparkling eyes. I gasped audibly at the sight of her, and my effusive compliments were sincere. Her dad came out to watch as her mom took pictures. I held a silver shawl for her, and we left with my mind in a haze. In the car, she scooted over beside me on the way to Trina’s and leaned her head against my shoulder, my arm clutched to her breast. I was having trouble breathing. She talked excitedly about the prom and how much fun it was going to be.
Maryanne stayed in the car while I went in to get Trina. Her mom answered the door. I was just about fucked on the spot! She pulled me hard against her and tongue-kissed me. She was panting when we broke the kiss, and I was getting hard. She whispered, “I’ve missed you, honey. Please come over sometime.” I was speechless as she pressed her pelvis against me. I finally mumbled that I was pretty busy and I had to be careful. Her eyes were smoking when she stepped back and squeezed my cock, reminding me of how horny she had been before. She smiled up at me and whispered, “Oh, now I’ve gotten lipstick on you.” She took my hand and pulled me into the kitchen where we had first fucked and took a damp washcloth to my face. We had barely gotten back to the door when Trina came down the stairs, looking even hotter than Maryanne. Her dress was a clinging red satin, and she couldn’t have had underwear on. Two straps tied behind her neck, and the damn thing had no back or sides. The skirt flared a little, and that just emphasized her tiny waist. The simple dress just framed her beautiful face and figure. Her hair was up, and pearls were on her neck and ears. She didn’t need jewelry, and she knew it. I was stunned again and complemented her dress and beauty profusely. She smiled, walked right up to me, and gave me a very hot kiss. I almost fainted when she stepped back and smiled at me.
“I’m really ready for a big night, Mike, darling. Are you?” I croaked out a squeaky “yes” and looked at her mother. Emily had no expression as she looked at Trina. Oops, now ladies don’t start fighting. I quickly hustled Trina out of there. On the way to the car, Trina was laughing and shocked me when she said, “Mother hates it when I get the handsome guy’s attention.” She wanted to sit in front with Maryanne, so that’s the way we went to the restaurant. We entered with them on my arms. They looked dangerously sexy and drop-dead pretty. Every eye turned to them, and they loved it. We were seated and looking at the menus when Kathy and Chuck came in. I then knew why Kathy had not let me see her in the dress. The material was shimmering black and clung to her body. A line of black crystals ran up a slit in the front and seemed to point at her pussy. A single strap of black crystals over her shoulder pointed at her nipple, barely hidden under the material. Her diamond pendant nestled between her breasts, seeming to light them up. She had Mom’s big diamonds on her ears. She looked like a very sexy and mature woman, except for the obvious body of youth. She was smiling sexily as she walked, and it was a walk I hadn’t seen before; a sexy and confident walk. I guessed that Anita had coached her. I stood to greet them and noticed the restaurant was hushed, and people were whispering. Kathy stepped toward Trina and offered a gloved hand. The outfit was so together that I hadn’t realized she had long gloves on, matching the dress. She was definitely the queen of our little enclave. Trina said she looked gorgeous, and Kathy returned the compliment. Next, she shook Maryanne’s hand, and they traded compliments. I seated her, and she took her gloves off smoothly as she told Trina how happy she was to have dinner with us. Chuck sat between Kathy and Maryanne, looking comfortable and handsome. Kathy’s gloves went into a small purse that matched the dress.
Trina whispered loudly to Kathy, “Where did you get that dress?”
It would have sounded ostentatious if her eyes hadn’t been dancing so. Kathy said in a very sophisticated voice, “Oh, it’s just a rag I picked up from Halston in New York.”
Trina’s eyes got big and she mouthed an O, gulped, and said, “Really?”
Kathy grinned, “A friend took me there last week to get fitted.” That started the talk, and dinner was a big success. We were just finishing when Kathy asked the waitress to give Karen our compliments. Sure enough, a few minutes later, Karen came out of the kitchen and greeted Kathy like a sister. She was wowed by Kathy’s dress and smiling widely. Kathy introduced Trina and Maryanne. Karen asked the requisite questions about our dinners and thanked us for coming, and then she hurried back to the kitchen. We dawdled over coffee, talking like old friends. Trina asked Kathy and Chuck to sit with us at the prom. That was certainly a break from traditional protocol! Chuck and I paid the checks, and we left for the dance. Trina sat in the middle on the way and whispered that she was going to fuck me till I couldn’t walk. That got my attention. The gym was decorated like a cityscape, and it was labeled with New York banners. I entered with Trina and Maryanne on either arm, feeling pretty proud. We were fashionably late, and the place was pretty crowded. All eyes turned as we entered, and a loud buzz started immediately.
Trina whispered to me, “This alone was worth it! Isn’t it amazing that little things can create such a stir?” I had to agree with her. Several girls rushed over to us to complement Trina and Maryanne. Girls that had never spoken to me were acting like old friends. I overheard several girls ask Maryanne and Trina why they were both with me. Trina started answering them; “It takes both of us to handle him.” Maryanne picked up on it and told a few that I was more than they could both handle. It was pretty funny after a while, and they were enjoying the attention. We sat at a table with some of their senior friends, and one was the football player that didn’t seem to like me. His date was one of the cheerleaders, and she seemed to be ignoring him. When Kathy and Chuck joined us, Kathy became the focus of attention as word got out that she was dressed in a New York designer outfit and friend of the queens, Trina and Maryanne. I was looking at Kathy analytically, and I tried to be objective. In that environment, she gave away nothing to Trina or Maryanne. Her figure was as good as Trina’s, and she was definitely pretty. The asset Kathy had over both of them was that she carried herself so well and seemed comfortable with the attention.
When the band started playing a fast number, I asked Trina to dance, and Maryanne the next. Kathy danced with Chuck, and she was drawing a lot of eyes. I realized that Chuck and I were pretty good dancers, and it was fun getting sexy on the floor with Trina and Maryanne. The first slow song was Maryanne’s turn, and she melted against me. I was hard in a couple of minutes, and she worked her pussy against it. She whispered in my ear, “I don’t think I’ll be able to wait till prom is over.” I kissed her ear and said I couldn’t wait either. She held my hand on the way back to the table, and she whispered something to Trina when we sat. Trina’s hand immediately grasped my cock, and she felt the length of it, then squeezed it hard.
“Mike, I had almost forgotten how big it is,” Trina breathed into my neck. A moment later, Maryanne’s hand joined Trina’s, and I warned them that I wouldn’t be able to dance if they kept it up. They both giggled and told me that they would take care of me later. When they let go and sat back, Kathy gave me a raised eyebrow. I just shrugged and gave her a wan smile. I had to sit out the next fast dance till my cock went down, and then I danced with Trina.
At 11:00, the junior class president took over the microphone to announce the Prom King and Queen. It was no surprise when Maryanne was one of the Queen’s Court and Trina was the Queen. Trina looked sincerely surprised when it was announced. She leaned over, kissed me sweetly, and then I stood and offered her my hand to rise. She looked like a queen as she took the stage. She was tied up with pictures and dancing with the guy who was King for a long time. He was the football team captain and star of the basketball team. Maryanne was paired up with a guy who was probably five inches shorter than she was. She smiled a lot, but I knew it was a strain. I asked Kathy to dance a slow dance, and she was pretty proper as we danced. She laughed and told me that my cock was pretty evident when I was dancing with Maryanne. I explained what had happened, and she warned me that it was going to be a long night.
When Trina and Maryanne came back to the table, Kathy had gone to the restroom, and I asked Chuck to dance with Maryanne while I danced with Trina. Trina was pretty excited, and she was humping my cock as we danced. I got hard again, and that only made her hotter. When the song ended, I told Trina to lead me back because my cock was tenting my pants so much. She giggled and spun away from me, saying, “Let the nosey bitches see it, Mike. They’ll eat their hearts out.” Sure enough, she stayed arm’s length away from me on the way back, and several of her friends were staring at my crotch. I was pretty embarrassed by the whole thing, but Trina seemed to get even hotter. When Maryanne and Chuck sat down, there was more whispering with Trina. Trina looked at Maryanne with an amazed stare and then she whispered to me, “Maryanne says that Chuck’s cock is longer than yours. Is it?” I gave her a noncommittal shrug and told her to check it out. She got an evil smile on her face and promptly went over to sit in Kathy’s chair. She leaned her forehead against Chuck’s neck, and her hand disappeared under the table as she whispered to him. His eyes got bigger as she groped him. She was giggling when she hugged his arm and kissed his neck. Kathy was approaching, and I could see from her expression that she knew what Trina was doing. Kathy bent down and whispered in Trina’s ear. That caused a start in Trina, and she stood quickly, hugging Kathy. They talked for a minute, and Trina returned to her chair with dancing eyes. Trina whispered to Maryanne and me, “You were right, Maryanne. He is longer, but not as fat as Mike. Kathy is a stitch. She told me he can fuck for hours before he cums. I invited them to our after-prom party.” I asked where it was, and she just winked at me.
We left at midnight. Trina directed Kathy and Chuck to follow us. We went straight to Trina’s sister’s apartment. Why was I not surprised? Kathy and Chuck were right behind us. Trina rushed us up to the apartment. Once inside, she directed us to sit as she went into the kitchen. A couple of minutes later, she brought out a tray with a bottle of champagne and five glasses. She asked me to open and pour. After I had handed out the glasses, I toasted the three most beautiful women at the prom. Trina toasted me as the best lover at the prom. Kathy toasted Chuck as the best lover in town. The glasses were emptied quickly. Trina looked at Kathy, “Kathy, Maryanne and I brought your brother here to fuck him till sunrise. I asked you to join us because I thought you and Chuck might like to have some fun. Want to stay?” Kathy nodded and looked at Chuck. He gave a lopsided grin and shrugged. I tried to protest that I hadn’t been asked. Trina told me to shut up and take my clothes off. Kathy giggled and told Chuck to do the same. We both protested that they had to strip too. Trina ordered us to get naked first. I looked at Chuck and shrugged. He shrugged too, and we started to strip. That started the girls humming “The Stripper.” Chuck and I got into it, and we put on a show for them. When we dropped our shorts, they cheered and clapped. I was semi-hard, but Chuck was still limp.
Kathy beckoned Chuck closer, and as he stepped up, she grasped his cock and told the girls, “Watch this.” She bent forward, gave his cock a long lick, and then swallowed it. I could see her throat working, and a minute later, he slipped from her lips, significantly longer. She swallowed him all the way again, and there were gasps from Trina and Maryanne. When he slipped from her lips that time, he was almost full-sized. Kathy grinned at the girls and made a production of slowly swallowing him again. This time, he groaned, and his hands played over her hair.
Trina gasped, “My God, Kathy, how do you do that?” She withdrew him slowly and beckoned Trina to try it. Trina went to them like a zombie and sat beside Kathy, taking Chuck’s cock from Kathy’s hand. Kathy proceeded to coach Trina on how to swallow it, and after much choking and gagging, she got him down for a few seconds. Maryanne was next, and she wasn’t able to do it at all. By then, I was hard too, and Trina noticed. She stood and announced, “Come on, girls, let’s get naked and fuck!” What followed was a wet dream for every guy in our high school. As Chuck and I hummed a stripper beat, they got naked. Maryanne was a little bashful at first, but she got into it and was doing a bump and grind like a pro. Standing naked beside Trina, Kathy had the same figure, and her pink swollen aureoles were a definite turn-on for me. Trina was jealous of Kathy’s shaved pussy and the trim of her pubic hair. I almost blurted out that I would do her like I did Kathy’s. Trina was wiggling her butt in front of Chuck, and then she would push back against his cock. She asked Kathy, “Will you share?” Kathy said, “If it’s OK with Chuck, it’s sure OK by me.”
Trina stood close in front of him so his cock was touching her belly and her tits his chest when she asked, “Chuck, honey, would you please put your cock in my little pussy?”
He grinned as he looked at her for a minute and said, “Do I want to fuck the Prom Queen? Well, if I must.”
She giggled and pushed her tits harder into his chest, “Thanks, honey.”
I moved over to Maryanne and put my arm around her waist, then whispered, “Let’s go into the bedroom.” She smiled at me sweetly and nodded. I told the others we were going into the bedroom and to have fun. We walked in with her head on my shoulder and pulled the covers down on the bed. She got on and held her arms out to me. We melted together in a long kiss and she pushed her body against me. I began to explore her body for a long time, kissing and sucking her breasts, belly, legs, and finally her sweet pussy. She came alive, moaning and rocking her pussy against my face. She became more and more agitated when I avoided her cunt and clitoris. I trailed my fingers over her ass hole and stroked her tits as I kissed and sucked her labia, when she whimpered and called out, “Please Mike, make me cum.” I slowly pushed my tongue into her cunt, causing her to arch hard against my face as her hands held my face there. I slowly tongue fucked her and she got more frantic in her movements. Her cunt was drooling with pussy juices and my face was smeared from ear to ear. I was very patient and waited for her to escalate her movements. The sign was when she tangled her fingers in my hair. I pushed a finger into her cunt as I moved my lips up to her clitoris. She started her orgasm as soon as I touched my tongue to her clitoris. She was bucking hard against my face and screaming for quite a while. I just held on and tried to maintain contact. When she let go of my hair I kissed her pussy a couple of times, pulled the finger out of her slippery cunt, and moved up to kiss her. She was moaning and rocking her shoulders as I captured her lips and kissed her sweetly. Her arms flew around my neck and she pulled me tight, pressing her body against me. When the kiss ended she asked me to put it in her. I raised up and guided my cock to her cunt. She was tight and it took several minutes before I was all of the way in her. I held still in her for a few minutes until she whispered breathlessly for me to go slow. I did just that, probably going slower than she wanted. We fucked very slowly for quite a while, until her cunt loosened up a little. She was moaning as I speeded up a fraction, and a few minutes later, she had another orgasm, crying out, “Oh God, Mike, Oh God!” I waited for her to regain her senses, and a few minutes later, I resumed. This time, she urged me faster, and her hands were pulling my butt hard as I slid into her cunt. Her calves were behind my knees as she leveraged her cunt against my thrusts. We fucked faster and faster as she built her intensity. I was getting the first cum surges when she began screaming and sobbing. That was the trip wire for my cum, and it rapidly pulsed up my cock. I drove into her hard as the spurts lasted for a long time. I was shaky when I finished and began kissing her face and neck. She was out of it for a couple of minutes after I rolled us over. A few minutes later, she was murmuring as I snuggled her neck, and my hands roamed over her body. We had been cuddling for about fifteen minutes before she raised her head and looked me in the eyes.
“Oh, Mike, it was better than I remembered. Thank you. I feel so wonderful, floating, and so content. This is what lovemaking should always be.” I told her she was beautiful and a wonderful lover. There was a pause, and she said quietly, “I need to ask my mother if she has this with my father.” I didn’t say anything until she asked, “I feel ashamed that we pressured you into taking us to the prom. Will you forgive me?”
I laughed, “Let me see if I have this right? You want me to forgive you for making me fuck the two most beautiful girls in the senior class? Is that right?” “I know how you feel about Annie. It was a dirty trick on both of you.” I assured her that I was more than OK with everything, and she would have to take Annie’s feelings up with her. She sighed and nuzzled my neck, saying, “I’ll do that, and thanks again.” We heard someone yelling, and she asked, “What was that?” I told her we should go see. She agreed and slowly got up off me. My cock flopped out of her, and she giggled, “We are making a big mess on Elaine’s bed.” She cupped her hand over her pussy and ran into the bathroom. I followed her and got her a wet washcloth as she sat on the toilet, wiping her pussy. She smiled at me shyly and said softly, “I feel so warm and happy with you, Mike. I’m usually pretty shy about my body, but with you, I’m not at all.” I told her she shouldn’t be shy at all. She should be proud of her body, and I loved seeing her like this. She finished wiping her pussy and stood up to wash my cock off. She giggled as she fondled me. I stroked her breasts as she worked, telling her that she had wonderful breasts. She sighed and took my hand, leading me out to the living room.
The racket we had heard was Kathy having an orgasm. Chuck was on his back in front of the fireplace with Kathy riding him steadily. Trina was sprawled on her back beside them with her legs spread wide and her pussy looking well fucked. Her eyes were closed and her mouth was slack as sweat covered her body. She had been fucked hard. I went into the kitchen and found another bottle of champagne in the fridge. I opened it and carried it back into the living room. I found two glasses and poured some for Maryanne and me. She was sitting on the couch, intently watching Kathy fuck Chuck. I startled her when I put the glass in front of her. She looked up at me blushing and took the glass with thanks. I sat beside her and wrapped my arm around her shoulder. She nestled against me and whispered, “They don’t even know we are here. Isn’t it something, the way they are so sexy?” I told her that the yelling we heard was probably Kathy and to watch her when she had another orgasm. Maryanne never took her eyes off them as they slowly increased speed. Kathy’s tits were bobbing up and down as she rocked her cunt over the length of Chuck’s cock. It reminded me of watching someone riding a horse at a gallop, smooth and strong.
It was several minutes before Kathy began muttering and a couple of minutes later she began yelling and swearing, “Oh fuck! Fuck me you cocksucker! Oh shit! It’s fucking crazy! Oh God, fuck me! Fuck my cunt you ass hole!” On and on she went in a constant stream as she came. When she collapsed and was quiet, I told Maryanne that Kathy always yelled like that when she had a hard orgasm and she didn’t know she was doing it. Maryanne was amazed. I asked her, “Did you know you scream when you cum?”
She looked at me aghast.
“No, I don’t! Do I?” I nodded, grinning. She smiled and shook her head, looking back at Kathy, lying flat on Chuck’s chest, panting and shaking.
I whispered in her ear, “Chuck grunts when he cums and he hasn’t cum yet. Would you like to try him?” She gasped and blushed, staring at them.
Looking at me with her eyes big, she asked, “Would he like to?” I assured her he would. God, who wouldn’t? She asked me how she should ask him. I laughed and stood up, went over to them, and helped Kathy off his cock. Kathy groaned as it popped out of her. Chuck looked at me curiously. I nodded toward Maryanne on the couch. He understood and held a hand out toward her. She blushed and slowly made her way over to him.
She was standing beside him when he asked, “Are you ready?” She nodded shyly, and he held a hand up to her. She took it, and he guided her to straddle his hips. She looked over at me, and I reassured her that it was OK. She stepped across him, her pussy directly above his cock, lying hard along his belly and glistening from Kathy’s cunt. He reached up to her hips and pulled her down. As she lowered herself, he held his cock up with one hand toward her pussy. When it first touched her pussy, she gasped and froze. He wiggled it to spread her labia, found her cunt, and raised his hips to start it into her. She gasped again, placing one hand on his chest and the other to her breast as she lowered herself a few inches. Her eyes got big, and she looked down at the juncture. Only a few inches were in her, and she had about seven to go. Very carefully, she watched as he slid into her cunt slowly. She sucked in a deep breath and held it for the last few inches, then it all left her in a whoosh when she bottomed on him. She whispered, “Oh my God, it’s all the way in!” It was then that I noticed Trina was up on an elbow, watching them. Maryanne sat rigidly on him for a few minutes, and then slowly, she began to relax and enjoy the feelings. Her hands came to rest lightly on his chest, and she whispered to him, “This is nice.”
Chuck nodded, “Yes, it’s very nice. You look beautiful.” She smiled at him and slowly rocked her hips. She murmured softly, then lowered her knees to the floor and began to gingerly fuck him. It was a couple of strokes before she had confidence and began fucking him in earnest. Trina motioned for me to help her, and I stood to help her up. She grinned as she came into my arms.
“That was wild, Mike. He is something else.” I nodded and told her that he can go for hours without cumming.
“My God! He is fucking all three of us, and he hasn’t cum yet?” I nodded with a grin. She shook her head in amazement. I handed her my champagne glass, and she sipped it gratefully. She assured me that it was OK for me to open the other bottle. I poured another glass and knelt beside Kathy. I held her up and put the glass to her lips. She smiled at me and took a drink. That revived her, and she took the glass from me. I returned to Trina. Taking another glass, I filled it and led her into the bedroom. She giggled, “Do you have designs on my virtue, sir?”
“I don’t have designs, young lady. I am going to fuck you till I fill your pussy with my semen.” She gasped theatrically and acted as if she was pulling away from me.
“Oh my! But sir, I’m just a young girl who is afraid of your massive weapon.” I snorted and drained my glass. I urged her to finish hers, and she downed it in a big gulp. She set her glass on the night table, and we fell on the bed laughing. She shrieked when her shoulder landed in the wet spot. I hopped out of bed and fetched a towel. We spread it over the spot, and then I began to work her body over very seriously. Her pussy was very sensitive, so I had to be very gentle. She pulled me into a 69 and began to give me a gentle blowjob. She had an orgasm before I was hard and was almost to her second one. I pushed a finger in her ass, and she had it. We switched ends, and I pulled her on top. She sat up and, grasping my cock, guided it into her cunt. She was slippery, but tight, and it took her a few minutes to get all the way in. When I was finally seated in her cunt, she said softly, “Oh man! It feels like I have a post in me. Chuck’s felt like it was in my throat, and yours almost splits me open.” She shuddered, and her tits jiggled nicely. I took them in my fingertips and began the gentle strokes. She sighed, “Oh Mike, that’s so nice.” That was the beginning of one of the longest fucks I could remember. She was all over me. We changed positions at least six times, and she must have had a dozen orgasms. When I finally came, I passed into the red fog, yelling my head off. I was on my back when I came to. Trina was lying cradled in my arm, her head on my chest. I pulled the blankets over us, and I fell asleep.
I woke, sandwiched between two soft bodies. Trina was in front of me, and Kathy was behind me. I got out of bed gingerly and went to the bathroom. I pissed, washed off quickly, and brushed my teeth with my finger. I crawled back in bed after I confirmed that Chuck and Maryanne were asleep on the floor in front of the fire. They had couch pillows and a comforter over them. I fell asleep again.
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