Science Affair
Copyright© 2025 by Anonymous
Chapter 17
Young Adult Sex Story: Chapter 17 - 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
Kathy and Steph were excited to see us back and especially excited when Mom told them about Annie and me. Kathy was so relieved that she hugged Annie and cried. Steph smiled and hugged Annie, welcoming her to the sex-crazed family. Steph looked at Chuck and me analytically, then said mildly, “You boys had better take your vitamins and get plenty of rest, but before that, Chuck honey, I’m really missing you. Let’s go upstairs and I’ll demonstrate.” She took his hand and almost ran upstairs. I wished him luck on his mission.
“Tell my parents I loved them if I don’t return,” he called over his shoulder. Steph grinned and hugged him around the waist. They were kissing when they reached the landing. Annie grinned at me and then Mom offered to show her around the house. They went off toward the kitchen while Kathy questioned me about the weekend. I tried to explain what had happened and almost forgot about the third prize. I asked about her weekend and she said they had fun, but she missed me terribly. She said the basketball game was fun and Steph had taken her shopping. They had bought some neat clothes, but it wasn’t the same when I wasn’t with them. She almost cried again. I pulled her onto my lap and held her tight.
“It scares me to think how much I’ll miss you when you leave me, Mike.” I told her I would always love her and we had a long, sweet kiss. I whispered that we should go up to my room. She smiled and hugged me hard, “I was afraid you wouldn’t want me when you got home.” I kissed her eyes and told her I would always want her. We went up to my room as Mom and Annie came down from upstairs. Annie smiled and winked at me. I made long, sweet love to Kathy. She was terribly affectionate and cried when she had her first orgasm. By her third one, she was yelling and swearing like normal. After we showered, she was back to normal and telling funny stories about some of the basketball players and cheerleaders.
We were all sitting at the kitchen table drinking Cokes when I brought up the cruise. Annie immediately blushed, and Mom knew something was up. I explained to Mom that Annie had somehow managed to book a cabin on the same cruise we were going on. Mom just smiled warmly at Annie and said that it was wonderful. Kathy said coldly, “I don’t see why we need a cabin and a suite with five beds. We will only be using two beds.” Mom agreed and said she would talk to the travel agent and see if Annie could cancel her room and move into ours. Annie was really excited about it, and we talked about how much fun we would have. Mom asked Annie if she would like to go to the lake cabin with us sometime. Annie grinned at me and nodded.
Mom said dryly to me, “I take it Annie has been there before?” I nodded sheepishly.
“Oh, Linda,” Annie said with concern.
“Please don’t blame Mike for that. I feel terrible that we deceived you.”
Mom patted her hand and said softly, “It’s OK now. Mike learned his lesson.” I nodded, and Mom squeezed my hand. We talked about going to the cabin next weekend, and I hesitated to say anything. Then I blurted out, “I’m supposed to have a date with Mary Hansen Friday night, and Kathy has one with her basketball player.” They all looked at me like I was some weirdo.
Mom said, “Mike is supposed to at least maintain the appearance of having normal teenage relationships, as are Chuck and Kathy. Chuck is slipping since Steph won’t let him out of bed on the weekends, but it’s probably best if these two maintain appearances.” Mom was eyeing me with a questioning look, and I felt my conscience roll over and play dead. Annie agreed that it was a good idea. I couldn’t help blushing. I felt like a snake. We set the following weekend for the cabin. Mom invited Annie to stay next Saturday, and it was settled. I unpacked Mom’s car, and we settled in for a quiet evening of wild fucking. Actually, Annie and I went up to my room and made love before she went home.
After Annie left, Mom asked Kathy to go to her room while she talked to me. I felt my face flush. I knew she was going to chew me out about something. Kathy said, “Don’t kill him, Mom.” Mom assured her that she wouldn’t kill me, maim maybe, but not kill. After Kathy was gone, she reached into her purse and extracted a piece of paper. She laid it in front of me and said quietly, “I thought Trina Munson was your secret lover. Maybe you can explain this?” It was the note, Trina had put on the door to her sister’s apartment, telling me to undress and come into the bedroom. I blushed and hung my head in my hands. I told her about Trina and our meetings at her sister’s apartment. Mom shook her head as she took another piece of paper out and laid it in front of me. The Polaroid of two naked, headless blondes with big tits! Mom put a fingernail on the slimmer one in the picture, “I figure this is Mary, but who is this?” Her fingernail had moved to the other blond. I blushed and tried to hide.
I whispered, “Her mother.”
“My God, Mike! She’s married, isn’t she?” I nodded, looking at the table.
“And you had a picture in your pocket?” I nodded again. I was lower than snake shit. There was no way out of this mess, except to crawl and beg.
“You were planning on going there again Friday?” She was incredulous, and I was almost crying.
“I don’t know how to explain it, Mom. Mrs. Hansen was lonely. Her husband lives in Washington, and they haven’t been a couple for years. Mary confided in her that we had sex, and then it sort of included Mrs. Hansen. I don’t know how to get out of it.”
Mom was angry, “My God, Mike, is there a woman in this town that you aren’t screwing?” She paused and said softly, “I’m sorry. That wasn’t fair. Can you understand why I’m upset?” I nodded.
“Are there any more married women you have been screwing?” I nodded.
“Well, who?”
“Mrs. Langley.” I said morosely.
“Maryanne too?” I nodded.
“Jesus, Mike. Are you trying to get shot by a jealous husband, an irate father, or both?” Still looking at the table, I shrugged.
“What’s the story with Mrs. Langley?”
“She has been neglected for years too. Her husband has been having affairs. Maryanne caught us and confronted her mother, then asked her dad about the affairs. He confessed, and they are getting counseling now. Maryanne and I are friends now, and she talks to me about it. I haven’t had sex with either of them since the counseling started.”
Mom sighed, “Thanks for the small favors. What do you propose to do about Mrs. Hansen?”
I shrugged, “I don’t know what to do. They are both really nice, and I don’t want to hurt their feelings, but I know it can’t go on. I’ve been scared to death that Annie would find out.”
“Does Chuck know about this?”
“I don’t think so. Kathy does. I’ve been talking to her about it.” Mom stood and went upstairs to get Kathy. When they returned, Kathy looked scared.
Mom put the note and picture in front of Kathy and said, “Your brother left these in his pant pocket, where I found them doing laundry. He tells me you know all about it, so I guess you should be in on the murder. I think I am going to kill him.”
Looking at the picture, Kathy said, “Big tits. Mary and her Mom?” I nodded, still looking at the table.
“I’m sort of to blame for this, Mom. I talked Mike into taking Mary’s cherry. She talked to her Mom about it, and then she tried him out. You know what happens once she gets his cock in you.”
Mom snorted, “That doesn’t excuse having sex with a married woman. What do you think I should do?”
Kathy paused, “Well, you don’t HAVE to do anything.”
Mom looked at her and said flatly, “I should stand by and watch my son get involved with a married woman? I should just wait for the day he is called into court as a witness in a divorce? I should calmly wait for the day a jealous husband or irate father kills him?”
“Well, if you put it that way.” Kathy was chastened.
“Mike, look at me.” I looked into her eyes; they were hurt and pleading as she asked, “Do you want to keep having sex with these women?” I shook my head.
“Do you want me to intervene?” I shook my head again.
“What are you going to do to end it?”
“I’ll call them right now and tell the truth.” She nodded. I went to the phone and called Mary’s. Mrs. Hansen answered. I stumbled for a moment about what to say to her and then blurted out that I had to stop having sex with her.
She paused for a moment, “I agree, Mike. It is foolish of me to even consider continuing with you. Thank you for doing the right thing. I’ll tell Mary, and we won’t expect you for dinner Friday. Do you wish to talk to Mary?” I thanked her, and she went to call Mary. Mary picked up the phone, and I told her that I had talked to her mother, and we agreed that we would not have sex anymore. Mary was quiet as I told her that we should not have sex anymore either. I asked her if she would still like to date me if we didn’t have sex.
She paused and said softly, “That would be OK.” I thanked her and hung up.
Mom and Kathy were looking at me with worried expressions. I said, “I feel better now.”
Mom smiled wanly, “Promise me that you will not take up with a married woman again.” I nodded.
“What about Trina and the Langleys?” I told her that the Langleys weren’t likely to pursue it anymore, and Trina hadn’t indicated that she wanted to continue it either. She nodded and asked, “Is there anyone else I should be concerned about?” I shook my head. She picked up the note and picture; “Do you know what to do with incriminating evidence?” I took them from her and tore them up.
“Don’t ever put yourself in a position like this again, Mike. It’s just not smart.” I agreed and promised. Kathy looked at me sympathetically and patted my cheek.
The week went quickly. My workout on Tuesday was disappointing, and Billy laughed. She had warned me. Mom stayed out of my bed till Wednesday night. She was sweet and loving after that. Annie was having her period. Thursday’s workout was a little better.
Friday night, I went to pick up Mary for our date. She met me at the door looking very sexy. I was pretty nervous, and she seemed too quiet. Her mother came out of the kitchen to meet me. She seemed businesslike as she shook my hand and said softly, “It’s nice to see you, Mike.” I mumbled something and almost couldn’t look her in the eyes. She was looking at me with a questioning look and said quietly, “I suspect you got in trouble. Is that true?” I looked at her like she was clairvoyant, then I nodded.
“Did your mother find the picture?” I blushed and nodded, looking at my shoes.
“It was very foolish of me to let you keep it. Your mother must think we are real sluts.” I looked at her then and shook my head. I explained about Mom’s concern for my safety, the possible scandal if Mr. Hansen found out, and the dishonor of having an affair with a married woman. She nodded while I was talking and said, “Your mother is right. I’m not proud of my behavior, and I set a bad example for Mary. We have talked it over, and I have a plan underway to settle the situation with my husband, or our marriage will be over. I don’t want you or Mary to feel any guilt about the past, but I don’t want you two to have any more sex. Save that for marriage.” I nodded and looked at Mary. She was looking at the floor as I had been. Her mother said, “You two go have fun. Let’s chalk this up as a learning experience.” She went to Mary and kissed her cheek, then returned to the kitchen. I helped Mary with her coat, and we left. We had dinner at a Chinese place and talked about her mother. Mary was OK with the situation and said that she agreed with her mother about waiting to have sex until she was married. I agreed with her that it was best. I didn’t tell her anything about my sex life. We went to a movie that was pretty mushy and held hands. I gave her a short, goodnight kiss and hug at her door. On the way home, I realized that I didn’t have a hard-on the whole evening.
I had another shock when I got home. Mrs. Hansen was sitting in the family room with Mom! They both smiled when I stopped dead in my tracks, mouth agape. Mom said with dead calm, “Mrs. Hansen and I have been discussing the situation. Was Mary OK?” I nodded, still in shock.
Mrs. Hansen said with a reassuring smile, “Your mother is very understanding, Mike. Please be assured that we are both agreed that the affair is ended.”
Mom said quietly, “You may go to bed. We want to talk some more.” I ducked my head and tried to keep from running upstairs. I could feel their eyes boring into my back.
Kathy was in my bed. She didn’t mention anything about Mrs. Hansen. Her date was a dud. She said he just wanted to paw her tits the whole night. She didn’t think it was funny when I said she had great tits to paw. We made love, and I was gentle with her tits.
Saturday, I was finally caught up during my workout. I vowed to Billy that I wouldn’t let that happen again. Mom made no mention of Mrs. Hansen. Saturday night, Annie went out to dinner with us. I noted that she and Mom were becoming good friends. She had joined Mom at the hairdresser that afternoon, and they spent about two hours in Mom’s room getting ready. Kathy and Steph joined them about an hour into the exercise. I dressed and had trouble getting a shirt to button around my neck. I was definitely getting larger in the neck and shoulders, but the feeling of strength was almost narcotic. I was beginning to understand why bodybuilders became addicted. My sport coat was getting tight too.
The grand entrance was grand indeed. I was getting used to seeing Mom, Steph, and Kathy dressed to give a hard-on, but now Annie was another jewel in the crown. She was built almost exactly like Kathy and the same size, but she brought elegance to a sexy dress that Kathy didn’t have yet. Chuck and I were whistling and clapping as they came down the stairs. There was a whole lot of exposed jiggling tit and leg. Annie had a red wool sheath slit up the front of her thigh, very low cut, and the back had thin straps criss-crossing. Her hair was up and some diamonds sparkled at her tits and ears. She had on more makeup than a schoolteacher would usually wear. She was beyond hot! Mom was in a black mini-dress with lots of tit showing and Steph was in a flesh-colored mini-dress that proved she didn’t have underwear on. Her nipples were very prominent and I could almost see the color of them. Kathy had a very low-cut brown silk top, no bra, and a black leather micro-mini. She looked very suckable. I warned them that men would fight for them tonight. As I was putting Annie’s coat on, I asked her how she liked going out with the sexy women of my family. Her eyes were sparkling when she said, “This is fun, honey. I love them all.” I told her she was too sexy to go out in public as I kissed her neck. She laughed, “As long as it works on you, honey.”
I drove us to Karen Schmidt’s restaurant. The entrance was dramatic. It was like the invasion of the beauty queens in rape dresses. The maître d’ remembered us and was very nice. We even had the same waitress. She was glad to see us. After the drinks were ordered, the chef, Karen Schmidt, came out for a minute to say hello. She made a wine recommendation, then hurried back to the kitchen. We felt honored that she had interrupted her work to greet us. Mom ordered the wine Ms. Schmidt had recommended and hors d’oeuvres. The wine came promptly, and I was surprised that the waitress brought wineglasses for all of us. She poured for Mom to taste and then around the table. It was a red wine. I normally didn’t like red wine, but it was very aromatic and seemed to explode with flavor as I sipped it. Maybe I could learn to like red wine. Mom explained that red wine was more complex on the palate, but once I gained an appreciation for it, red would become my favorite dinner wine. Once again, we ordered different things, and I decided to try the duck with a cream sauce. The appetizers were wonderful, and a second bottle came. We were all having a great time, and I was happy that Annie seemed like she had always been a member of the family. I also realized that Chuck seemed as if he had always been a member. I proposed a toast to the “family,” and everyone agreed. The dinner was more special than the last time.
Kathy surprised us when she asked the waitress if she could see the kitchen. The waitress returned a minute later and escorted her back. Mom was as surprised as I was, and Annie noted that Kathy had borrowed one of her cookbooks. She was gone for at least a half-hour and came back with Karen Schmidt escorting her. They were talking to each other rapidly, and Kathy seemed excited. Ms. Schmidt asked how our dinners were, and we all agreed the food was wonderful. Kathy was bubbling when she said, “The kitchen was fantastic! Everything is crazy! People are yelling, running around, and Karen is so cool and in charge. She knows all the recipes in her head and works so fast, it’s amazing!” Karen smiled and assured us that it’s not always that crazy and she doesn’t always remember everything. She thanked us for coming and hurried back to the kitchen. Kathy was still excited and rattled on about how Karen seemed to know exactly what to add to a dish and how much. “Then she prepares the plate, and it’s beautiful when she is done!” Mom was looking at her open-mouthed, then she looked at me, and I smiled. We grinned at each other, and then Mom asked Kathy why she was so interested. Kathy shrugged and said, “I just thought it was interesting that a pretty woman could be so professional and creative. Mom, it’s awesome the way she runs that kitchen!” Her eyes were sparkling as she said, “I want to be a chef and own a restaurant.” Mom smiled and told her that was wonderful. Mom paid the check, and we went home feeling content and mellow. Kathy was still excited about the kitchen and talked about how you learn to be a chef.
When there was a break, Mom told her, “We have the basics for you to be a chef, honey. We have food, a kitchen, and people that eat. You can try out on us. I’ll work out a menu with you, and you can practice at home.”
Kathy snorted, “Wait a minute. You think you are going to get a free cookout of this?”
“You can’t blame me for trying.” We all voted for Kathy to be the house chef. She didn’t think we were funny.
At home, Mom served cocktails to Steph and Annie while Kathy looked over the cookbooks in the kitchen. Mom said that this was the first time she had seen Kathy so interested in a profession. Annie suggested we get her some Julia Child books and information on cooking schools. Kathy’s birthday was next month, so I told Mom that the books would be on my list.
We settled in front of the fire to talk, and eventually, Kathy joined us. Annie and I were cuddled on the love seat while Chuck was on the couch, his arms around Steph and Mom. Kathy plopped on my lap and cuddled my neck, telling Annie, “You have to share him tonight.”
Annie smiled and said with a giggle, “Let’s wear him out.” Now there is something that will really worry a teenage boy: two hot-looking women saying they are going to wear him out. I laughed and reminded them that it was two to one and they had to play fair. They both gave me evil grins as they shook their heads. Feigning fear, I dumped Kathy off my lap and ran upstairs to my room, where I hopped under the covers on my bed. Annie and Kathy came running into the room and after much bravado, they pulled the covers off me and began taking my clothes off. They did it rapidly, with a lot of laughter and giggles. When I could, I would tickle one of them. They were still dressed and I wanted to be careful of their clothes, so I helped them undress and we all fell on the bed with a lot of kissing, giggling, and squirming. It was wonderfully erotic, wrestling with two warm women; feeling breasts, lips, bellies, thighs, and pussies all over my body. I was finally able to hold Annie still long enough to get her long clit between my lips. I was hunched over her belly, on my knees, when Kathy sucked my cock into her mouth. The fight went out of Annie immediately and I wasn’t going to pull my cock from Kathy’s lips anytime soon. I figured that I would have to get Annie there fast and then work on Kathy or they would make good on their threat. I plunged a finger into Annie’s quickly lubricating cunt and found the sensitive spot while I set a steady pace, licking and sucking her clit. She hadn’t had an orgasm since last weekend, so I figured it would be quick. It was hard to hold onto her with Kathy’s head in the way, but I managed. Annie was rising to meet my lips in rhythm to my finger in her cunt. I cupped her ass with my free hand and began tickling her ass hole. She quickly started bucking against my face. I was trying to ignore Kathy, but she was getting very good at blowjobs. She didn’t have the right angle to swallow, but just the attempt was very stimulating. I pushed a fingertip into Annie’s ass, and she started her orgasm. It lasted quite a while, and when she pushed my face away, I immediately swung on Kathy and started her the same way. She was already wet, and it didn’t take her long either. I was getting close to cumming in her mouth when she began bucking hard on my face and let my cock out of her mouth. When she pushed me away, I rose to look for Annie. She was lying on a pillow, watching us with a content look. She smiled at me, and I attacked her with kisses all over her face and body, smearing pussy juice all over her. I snared her clit and flipped it back and forth with my tongue until she pulled me up and asked me to fuck her. I didn’t hesitate and slid into her, hot and smooth. She clamped her legs around my butt and arched to meet me. I drove her butt into the bed, and we stayed motionless for a minute. She whispered, “It’s been too long, Mike. I need this.” I frantically kissed her face, and she trapped my face with her hands and kissed me hard, her wild tongue dancing in my mouth. The wild fuck urge eased, and when her legs let me, I began slow, controlled fucking. She met each thrust, and we kept the pace steady for a long time. Little changes with her hands or legs indicated a change of pace. It was like we were reading the same book, page, word, and letter at the same instant. My cock felt huge and strong in her. She was light as a feather as she used her strength to lift effortlessly to meet me. Her eyes were looking into mine with love, and I gave it back to her. I was whispering love to her in time to our fucking, almost musically. The pace increased gradually, and I was amazed again at her strength as she lifted her body to meet me. Her eyes were unfocused, and her gasps were catching when I felt her cunt begin the nipping spasms of her orgasm. She held the pace, and I felt the beginnings of my orgasm. I stopped, and she held me close as her orgasm diminished. A minute later, I started again, in control. Her eyes focused on me again, and I saw them sparking, as if she was telling me that the next time I wouldn’t be able to stop. She stepped up the pace more quickly, and this time when her orgasm started, she began thrusting harder against me. I couldn’t control myself, and the surge in my cock was much stronger. I lost control, and she met my insane thrusts as perfectly as ever. I was thrusting and yelling as my cum surged up and into her in great bursts. The red fog settled over me, and when I came back to her, she was holding me tight with her legs and arms, humming something meaningless to me as her cunt spasms squeezed my cock. I raised a bit and kissed her face with gentle kisses. We were both soaked in sweat and breathing very hard. I looked over at Kathy, and she was grinning at us.
Kathy said, “That was so hot, you guys!”
“I agree, honey. He tried to pull that stopping shit on me the second time, and I wouldn’t let him.” Annie was looking at me as she gasped it out. I just grinned at her and shrugged. She slapped my butt, and I pushed my semi-hard cock into her involuntarily. Her eyes got big for a second, and her mouth formed an ‘O’. I gave her a wide-eyed grin and asked her if I was wearing her out. She looked at me with arched eyes and said, “Not for a minute, big boy.” Her cunt squeezed me hard, and it was my turn to look with big eyes. She grinned and said softly, “Got anything left for Kathy?” I shrugged and ground my cock hard into her slippery cunt, feeling the semen oozing out over her labia from the pressure. It felt wonderful, and my cock gave a little surge. She laughed and kissed me hard, then pushed me off.
I flopped beside Kathy. She gave me a big smile as she rose over me and rubbed her tits back and forth over my sweaty chest.
“I want you in me, Mike. I love it when you get hard in me.” Her eyes were smoky looking, and she seemed to be almost dreamy. She grasped my slippery cock, not yet hard, and rubbed the knob over her pussy lips several times before forcing it into her cunt. The feeling as my cock gave a little, then entered her, was erotic. She was hot and slippery as the fat, spongy shaft went into her. I felt another surge and arched up to her. She settled down on me, then pressed her tits into my chest as she kissed me sweetly. I hugged her close and stroked her butt softly. We lay with her head into my neck, her breath soft on my throat. I stroked her hair and told her that I loved her. She gave a contented sigh and stirred her cunt on my cock gently. I tried giving my cock a twitch and got a modest response from it. She murmured softly, and her knees squeezed my hips momentarily. Over the next several minutes, I tried giving my cock twitches, and gradually, they increased in strength. Kathy responded each time until I gave a twitch, and a definite surge flowed through my cock. Kathy whispered, “I feel it growing, Mike. I love this feeling!” She ground her cunt on me, and I felt a surge without forcing it. She raised her face a few inches above mine and looked into my eyes as she said softly, “Wanna fuck?” I grinned and nodded. She kissed me long and sweetly, then ground her cunt on me in a big circle. I could definitely tell I was getting hard. She raised up and braced herself on my chest. I began the gentle fingertip stroking of her breasts, and her nipples immediately hardened, the pink, puffy aureoles puckering at the base of her nipples. She sighed and closed her eyes dreamily as she slowly rotated on my cock. I was almost completely hard, and after a couple more minutes of slow stirring, I was. I tweaked her nipples a little harder, and she opened her eyes to look at me. I nodded, and she began her slow front-to-back sliding fuck. Her slick, smooth labia felt wonderful moving over the base of my cock and pubic bone. She moved steadily for a long time, and I held still, just stroking her nipples, feeling the friction decrease as she lubricated us. I was very sensitive, causing me to feel her cunt rippling over the flare of my knob and the hard nubbin of her clitoris, dragging over the top of my cock, when she slid my cock into her. Her breathing increased, and a pink flush moved from her face down over her chest and tits. Suddenly, she froze and gasped as a rapid flutter in her cunt sent ripples over my cock. The next stroke was a little faster, and I arched a little to meet her. Her lips were moving, but she wasn’t saying anything, just soundlessly mouthing words. The intensity of her orgasm increased rapidly, and when it peaked, she almost froze, then ground her clitoris against me rapidly as her tits jiggled and swayed under my fingers. A minute later, it ended, and she began the sliding, fucking faster. I was arching to meet her, but I was nowhere near coming. My cock was aching, and the sensitivity was excruciating, but I wanted to be in her as far as I could go. Kathy was going faster, causing her tits to joggle up and down. My fingers kept losing her nipples, so I began pinching them a little harder to hold on. She was really going hard when she began yelling and swearing, jerking her cunt hard on my cock. It was a long orgasm. When she slowed, her arms gave way, and she fell onto my chest. I held her and talked soothingly while she fought for breath, and her cunt rippled with aftershocks. She was so cute, I was overcome with emotion and just wanted to keep her folded in my arms forever. I would have rocked her if I didn’t have a post planted in her cunt. I crooned to her and stroked her affectionately for several minutes. When she raised her head, she smiled wanly and said breathlessly, “Annie’s turn.” I looked over at Annie, curled up beside me. She was smiling softly as I raised an eyebrow, and she nodded.
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