Science Affair
Copyright© 2025 by Anonymous
Chapter 15
Young Adult Sex Story: Chapter 15 - 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
I woke with Mom shaking me and saying it was time to get up. She was dressed for work, and she looked sharp. I grabbed her arm and pulled her down for a kiss. I loved her kisses. She pulled away after a hot minute, saying, “I’m going to get mussed up, and I have to leave.” I grinned at her as I stretched. She blew me a kiss and left. I snuggled to Kathy for a minute, and she murmured a good morning as she kissed me sleepily. I had a morning hard-on, and she felt it against her tummy. She pushed it down between her thighs and squeezed it against her pussy.
“Oh, Mike! I love to wake up like this!” We made love slowly and gently. After we came, we had to hurry to get ready. Breakfast was toast from Steph’s homemade loaf of bread and jam. We carried our books and coffee to the car. It was cold again, and the snow was crusty and hard. Chuck came running out of his house and jumped in. He looked refreshed and cheerful.
The three of us went into Annie’s classroom. She greeted us as we sat in front of her desk. She was wearing a dark blue two-piece wool suit with a lacy blouse visible at her throat. The skirt was long as she came around her desk and sat on it. She asked us how our vacation was. It was a rhetorical question, and Kathy was giggling. Annie’s eyes were twinkling. She unbuttoned the jacket slowly as she asked us about the science project. As the buttons came undone, it was apparent that she didn’t have a bra on. Kathy caught on to the situation and kept quiet as the game played out. When the last button was undone, she twisted her shoulders to one side so the jacket opened, exposing one tit. She continued talking as if nothing had happened. She reached to her throat and fingered the coffee bean pendant as she looked at me. Kathy couldn’t resist giggling. I was getting hard when she finally told us to check the servers. Chuck was as hard as I was, and Kathy couldn’t resist patting our cocks as we went back to do our checks. We showed Kathy what to do, and she understood fully. I got a lot of suggestive remarks about my hard-on as we worked, and Kathy broke up when we walked toward the door. Annie was pulling a nipple and fingering the pendant. Kathy asked if Annie did that to me every day? I nodded.
“No wonder you are horny when we get home!” I laughed and said it kept me alert for my classes since it was hard to sleep with a hard-on.
My first few classes were OK, and when I sat down in the cafeteria at lunchtime, Trina Munson joined me. That brought a lot of stares and a buzz of conversation. She was prettier than ever. I asked how her vacation had been, and she smiled as she said under her breath, “I was horny the whole time! Want to get together again?” My life flashed before my eyes! She smiled as if we were talking about the weather and said in a conversational tone, “My sister is traveling this week.” My cock betrayed me, and I asked her if tomorrow after school was OK. She nodded brightly and said, “See you there.” She suddenly started talking about her computer when Chuck came to the table. We talked about her computer until she finished her salad. She got up and left with a breezy, “Thanks, Mike.” Chuck was amazed! Several guys gave me the thumbs-up sign along with big, knowing grins.
Chuck said softly, “Let me guess.”
I told him curtly, “Don’t guess.” He nodded, and I knew that would be the end of it. As if the Trina episode wasn’t enough to get the rumors going, they went into volume production when Maryanne Langley stopped to talk to me in the hallway. She was cordial and friendly when she said she needed to talk to me soon. I told her I could meet her after I dropped my sister off at home. We agreed to meet at her house. She patted my arm as we parted. I was in a quandary about meeting her and Trina. During Study Hall, Chuck and I went to Annie’s room to check the trouble reports. She had a class underway, and Kathy was in it. When Annie saw me, she touched the pendant and with a straight face nodded for us to proceed. Kathy looked at me with a raised eyebrow. I scowled at her, and she grinned. Kathy and I could have a conversation without saying a word. We picked up the two trouble reports; both were in the library. We left, and Annie didn’t look at me as we left. Kathy met Chuck and me at the car. She was teasing me about Annie all the way to Chuck’s house. On the way home from Chuck’s, I told her I had been summoned to talk to Maryanne Langley. I got the expected ridicule from Kathy about my cock getting me in trouble. When I told her about the date with Trina, she really went off on me! I apologized repeatedly, and she finally cooled down.
I was feeling pretty guilty as I drove to Maryanne’s. She was waiting for me. She let me in, and we went to the kitchen for Cokes. She seemed a little more at ease than the last time, and I asked her how things had developed. She frowned. “It’s been hard. Mom and I had a long talk about you, her sex life, and Dad. She still thinks you are special, and I’m sure she would jump in the sack with you in a minute. She said she had no sex life for the last ten years and had never had an affair. Evidently, Dad has ignored her, so she just shut him off. She did suspect he has had several affairs, but she didn’t want to break the family up over it.” She looked at me with a pained look. “I don’t know how she put up with the situation for so long! It came to a head on New Year’s Day. Mom said Dad was hitting on my aunt, and she confronted him the next day. They had a big fight, and I ended up in the middle of it. I asked Dad if he had been having affairs, and he admitted it. I guess he could lie to Mother, but not me. He was really feeling bad about me being in the middle of it. When I asked why he felt bad about me finding out and not Mother, he was speechless. He has agreed to go to counseling sessions with Mom and break off his affair.” I told her I thought she had a chance of saving things. She nodded and looked at me with pleading eyes. “Mike, will you promise me that you won’t have any more contact with Mother?” I nodded.
“Even if she begs you?” I nodded again.
“Will you tell me if she contacts you?” I hesitated at that one.
“Maryanne, I have a hard time betraying a trust.”
She nodded. “I understand that. How about you tell her that you promised me you wouldn’t have sex with her?” I agreed that I would do that. She smiled and patted my hand.
“Thanks, Mike. You are a nice guy.”
“Maryanne, I’m sorry you had to get involved in this. I need to keep my pants zipped up. My conscience had been bothering me, and I ignored it. I guess it’s true that guys think with their dicks. I’m truly sorry.” She smiled wanly and patted my hand again.
“I can understand how it happened. Mother is a sexy woman. She was hurting and available. I’m sure most men wouldn’t turn her away.” I felt a little better when she said that. I thanked her, letting me off the hook. She smiled.
I asked, “How are you holding up through all this?” She looked at me for a minute, and tears welled in her eyes. I moved to her side, and she fell into my arms. I sat and held her in my lap as she cried for a long time. When the sobs began to abate, I stroked her hair and squeezed her tight. She sat quietly for several minutes more. She sighed and hugged me.
“Thank you, Mike. I needed someone to talk to.” I hugged her back. She sat in my lap with her head on my shoulder for several minutes more.
“I’m feeling much better! You are the only person that knows about this, and I wouldn’t know whom else to talk to. My sometimes boyfriend only seems to think of one thing.”
I laughed, “Now, what would that be?” She giggled and hugged me.
“Is that all you guys think of?”
“No, not all, but just about all!” I was trying to be lighthearted, and she matched my tone.
“Tell me truthfully. Do you think about screwing every woman you meet?”
Laughing, I said, “Only the sexy ones. When I think about girls like Dorie Madsen (class slob), I get a sinking feeling. I’ve even had nightmares about being in bed with someone like her!”
Maryanne exclaimed, “So! You do think about having sex with every woman you know! Even if it’s with revulsion!” I had to admit she was right. She laid her head on my shoulder again.
“Are you thinking about having sex with me?”
“Until a minute ago, no.” She giggled. I asked, “Do you think about having sex with every guy you meet?”
Laughing, her head on my shoulder, she said, “Only the sexy ones.”
“Are you thinking about having sex with me?”
She sighed, “Do I have to answer?”
“Only if you tell the truth.”
In a subdued tone, she said, “When I saw you having sex with Mother, I wondered. When we were together the last time, I wondered, and when I saw you at school, I wondered.”
I squeezed her a little tighter and asked, “What about now?”
She was quiet for a moment and said softly, “Yes.” My cock was doing its thing.
She wiggled her butt against it and, laughing, said, “I can tell that you are.” We sat there for a few more minutes, the tension building. She whispered, “I know how Mother felt when you were with her the first time.” I didn’t say anything. Another long pause, and she whispered, “Would you kiss me, Mike?”
I told her softly, “We won’t stop at a kiss, Maryanne. Is that what you want?”
She was quiet for a minute, raised her head to look me in the eye, and said, “Yes.” Her eyes were smoky blue and liquid-looking. The kiss just happened. I was breathing hard in a moment. Her kiss was soft and sensuous, then became hot when her tongue played over my lips lightly. She moaned and twisted her butt on my cock. Her hands roamed over my neck and back. I caressed her back and butt lightly. She became very active, pushing her breasts into my chest and wiggling her butt. She suddenly jumped up and pulled me upstairs to her room. Her bed was a lot like Kathy’s, a four-poster with a lacy canopy. She turned to face me and pulled me in for a kiss. She was almost as tall as I was, and her legs were longer. That placed her pussy right at my cock. She pressed against it and rocked her hips as the kiss progressed. She was breathing heavily through her nose and moaning. I caressed her back as her hands pulled my butt hard against hers. She broke the kiss and told me to hurry. She started taking her sweater off, and I began stripping. She had a slip on, so the long skirt was next. When the slip dropped, I was surprised at the size of her tits. They were compressed in a full bra. She released the bra clasp, and they sprung out, in all their glory. She had tits as large as Mrs. Hansen, but firmer. Her nipples were small, and the areolas were small. I had my pants almost off when she dropped her cotton bikini panties and showed me a trimmed light brown pubic bush. Her thighs were tight to her pussy, and her labia seemed fat. I was pushing my shorts down when she wrapped her fingers around my cock. Softly, she said, “I wanted to touch you the first time I saw your cock.” I stepped out of my shorts and pulled her to me for a kiss. Those big tits drilled holes in my chest. She kept her hand on my cock as I stroked her butt and back. I reached over to her bed and pulled the cover down as I backed her up to it. When her legs touched the bed, I pushed her backward onto it. She let go of my cock and giggled as she bounced. Her tits were shaking wonderfully as they flattened out a bit. I lay down beside her and started kissing her neck, shoulders, and down to those great tits. She sighed when I gently stroked one tit and gave the other little kisses and sucks. After I had given her tits considerable attention, I moved down her belly. She squirmed and whispered loudly when my lips first kissed her pussy. She was wet and wonderfully smelling. I had to push her knees apart, and as I kneeled between them to kiss her pussy, she whispered, “Nobody has kissed me there before.” I vowed to make it memorable. I began by giving her pussy lots of little kisses and sucks. Whenever my lips sucked in the vicinity of her hidden clitoris, she would moan and push her pussy into my face. She was dripping from the crack at her vagina down over her ass. My lips and chin were liberally coated. She arched hard against me the first time my tongue pierced her labia. She had the sweet, hot taste that I loved. I slowly licked up almost to her clitoris and then back down. Her labia parted more, and I began kissing and sucking the inner lips. She was really squirming around, and I had to hold her butt to keep contact. When my tongue entered her cunt, I was surprised at how small it was. She pushed hard against my face, and her hands were on the back of my head with gentle pressure. I began slow tongue fucks, interspersed with sucks, and she became wilder. She suddenly pulled my face hard against her as she arched, her belly rippling. She was having an orgasm already! I kept up the tongue and sucks until she eased her hold on my head, and her ass settled down on the bed. I slowly began kissing up her open pussy toward her clitoris as I inserted my finger in her cunt. I began circular motions with my fingertip until I found a spot that got a reaction, then I sucked her little clit. I wasn’t prepared for the explosion! She arched so hard I lost complete contact! I rapidly reinserted my finger and found the spot quickly. This time when I sucked her clitoris, I had her thigh gripped under my free arm. She tried to buck hard again, but my weight prevented her. She wasn’t making much noise, just short, jerky gasps and groaning exhales. Her tight pussy was clamped on my finger when I started licking her clitoris with the underside of my tongue. She cried a long, soft wailing sound as she tried to arch and pull my face harder to her pussy. It was a long orgasm. When she released my head, I quickly moved up and guided my cock to her pussy. I suddenly remembered an important point.
I asked breathlessly, “Should I use a condom?”
Gasping, she said loudly, “It’s OK!” I pushed the tip up and down her slit several times, and the opening to her vagina didn’t seem big enough. I nestled the tip against the opening and pushed gently. I slid the tip about halfway into the opening and held it there. She groaned, “It’s so big!” I backed off and gently fucked just the tip against the opening for several minutes, and I could feel her gradually open up. Millimeter by millimeter, I went into her. When the crown finally slipped into her, I slid smoothly all the way in. Her breath left her in a great whoosh and then came back into her in a great gasp. I held myself still until she gasped, “Oh my God!” Her hands were clutching my waist, so I held still for several more minutes while she panted. Her eyes were wide open, staring at nothing. When her eyes focused on me, she whispered, “This is incredible! I had no idea it would feel like this!”
I looked at her incredulously, “Were you a virgin?”
She smiled, “Not technically. I lost my hymen when I was thirteen with a neighbor boy. This is my first time since then.” I was shocked!
“Are you taking birth control?” She nodded. I breathed a sigh of relief.
“Tell me when you feel comfortable.” She smiled and hugged me.
“Oh, Mike, I feel so wonderful!” She had a dreamy expression.
“Maryanne, you look beautiful. You look and feel like you are glowing. Your pussy is so tight and hot, I want to stay hard in you forever!”
She smiled, “I think I would like that. Mike, would you move it a little?” I kissed her softly and started pulling out of her slowly. She was very tight, but slick. When I was almost all the way out, I stopped and held still. Her eyes were bright and looking into mine. Her hands pulled my waist slightly, and I went into her ever so slowly. She was panting when I bottomed in her, and I held still again. It was at least a minute until her hands moved, and I fucked out, then in slowly. We kept that up for a long time. Gradually, the tightness eased a little, and she was urging me to go faster. I slowly increased the speed and held it there until she was arching to meet me. Her face had a sheen of sweat, and her tits were rolling as we fucked. When her hands became urgent on my waist, I picked up the pace some more. She began to gasp, and a soft wailing cry came out of her. I kept up the pace until that orgasm started to subside, and I picked up the pace some more. I was still in control, but my cock had that huge feeling that I knew was a precursor to my cumming. She went into another orgasm, and I managed to barely keep control. The wailing sound was a little louder this time. Sweat was covering both of us. Her tits were jerking now with the power of my thrusts. She was still arching to meet me when I let loose. She was hard into another orgasm when I felt the cum surge start. It shot rapidly up my cock, and I was in a red cloud when I blasted into her.
She was gasping and lying limply under me when I regained some control. I rolled us over, and she lay on me for a long time as her breathing slowed and the sweat cooled. I caressed her body and whispered that she was beautiful, until she murmured something unintelligible. I hugged her, and she feebly hugged me back. She whispered into my neck, “Now I know why Mother wanted to fuck you again. That was beautiful, Mike!” I hugged her, and I felt her cunt squeeze my cock.
“You feel so good in me! So this is what post-coital languor is. I’ve never felt this content before. Life is beautiful indeed.” I laughed and hugged her hard. Her cunt squeezed me again. She raised her head a little and looked at her clock.
“I hate to move, but I don’t want Mother finding me like I found her. She might not be as discrete.” I hugged her and she slowly raised up until my cock slurped out of her tight sheath. She gave a little gasp, “I feel so empty!” She looked down at the cum smeared over my pubic hair and dripping off her pussy lips.
“Yuck! What a mess!”
“It’s not a mess, Maryanne. It’s you and me. Rub your pussy over my cock. It will feel wonderful. Looking between us, she lowered her pussy against the underside of my cock and slowly smeared the cum over us. It was sensuous and intimate.
She sighed, “It feels so ... so nasty! No, so sexy!” She laid down on me, and we kissed warmly as she slid her pussy over me. She sighed and raised up slowly. I told her we should take a quick shower, and she nodded shyly. I held her hand, and we went into her bathroom. I cuddled her to me as I started the water. She kept her head on my shoulder and her arms around my waist. No words were spoken when I stepped into the shower with her. I asked her if she wanted to wash her hair, and she nodded. I pushed her head under the water and shampooed her medium-length hair gently. I rinsed her hair and put her conditioner on. As I was massaging it into her hair, she sighed, wrapped her arms around my waist, lifted her face for a kiss, and pressed her body against mine. We kissed sweetly, and she sighed when the kiss ended. She laid her head on my shoulder and held me tight. I hugged her tight and whispered that she was beautiful. She sighed again and raised her head for another kiss. After that one, I told her we had better hurry. Her eyes lost the dreamy look, and she nodded. I washed her quickly with soapy hands, and she purred like a kitten when I washed her tits and pussy. I rinsed her with my hands to more murmurs of contentment, then I quickly washed myself. I turned the water off and carefully stepped out with her to dry. I toweled her hair vigorously, and she giggled. When I gently patted her body dry, she sighed and held my face to her tits when I sucked her nipples gently. I dressed while she sat naked on her bed, watching. I kissed her gently, and she smiled, “Thank you, Mike. I’ll remember this always. It was the loveliest experience of my life.” We kissed again, and I left.
Kathy was waiting when I got home. She was doing her homework in the kitchen. She looked up at me with a raised eyebrow. I said, “Her parents are getting marriage counseling. She asked me to refuse to see her mother if she contacts me. I promised I would.”
“So that took two hours?” She wasn’t mad, just skeptical.
“Would you believe we just talked?” Kathy raised her eyebrow.
“Mike, honey, do you have to fuck every horny woman who bats her eyes at you?” I blushed and felt my heart sink.
“Kathy, I didn’t go there to screw her. We just talked for a while, and she started crying. I hugged her for a while, and well ... The rest just happened.” I knew I was whining, but I couldn’t help it.
She nodded.
“I know, stud. Women can’t resist you, and you sure don’t resist them! Is she going to be after you for more?”
I shrugged, “I don’t know. This was the first time she had sex since she was thirteen. She was kind of overwhelmed.”
Kathy’s eyes were big in surprise.
“Did she have an orgasm?”
I nodded, “Several.”
“Jesus, Mike! She will be after your bod like a dope addict looking for heroin!” I shrugged.
“Do you want to fuck her again?” I shrugged again.
“Kathy, I can’t seem to say no. She is gorgeous and sweet. She needs somebody to talk to about the mess her parents are in, and I seem to be the guy she wants to tell. When she got sexy, I couldn’t make myself turn away. If she gets me alone again, I’ll probably screw her. I know I shouldn’t, but I can’t help it. It’s the same with Trina, Gina, and Mary. I feel like I’m turning into a male whore!” Kathy wrapped her arms around me and hugged me.
“My big brother, male slut.” She laughed, and I hugged her back.
“Go do your homework. I’ll call Mom and have her bring carryout home. Do you want pizza, Chinese, or pasta?” I shrugged, and she said, “Pizza, OK?” I nodded and glumly went up to my room.
I was into my math when Mom stuck her head in and said, “Pizza is ready, honey.” I got up and kissed her with the soft, sexy kiss and hugged her. She sighed and leaned against me for a minute.
“I’m going to change, honey. Go eat.” She went to her room, and I went downstairs. Kathy had set the table, and we ate in silence. Mom came down in jeans and a sweatshirt, looking like a teenager with her hair in a little ponytail. She ate with us and asked about school. Kathy talked excitedly about working with Chuck and me on the computers. I talked about my Calculus and Physics classes. It was a relaxed and normal meal. I realized that this was the first time we had been together like this for quite a while. When I mentioned it, Mom smiled. “Nice. Isn’t it?” Kathy and I both agreed.
After dinner was cleaned up, I went back up to study. Kathy came into my room in her pajamas and climbed on my bed with one of her books. She was reading when I finished. She looked up from her book. “Mom and I talked. We are going to take turns sleeping with you on school nights. Tonight’s her turn.” I stared at her, open-mouthed.
“Go to her room and have fun!” Her eyes were sparkling. She just loved shocking me! I jumped on the bed and flipped her over on her stomach. She shrieked as I spanked her butt with a couple of sharp swats. I let her up, and we kissed a hot kiss.
“Wait till tomorrow night! I’m going to be really horny by then!” I grinned at her as I got up off the bed.
I undressed and went down to Mom’s room. She was sitting up in bed, bare-breasted, reading. She smiled at me as I got in bed. She put her book aside and turned the light off. The first kiss had me hard, and we made slow love for at least an hour. When I finally came, I was drained. I fell asleep with her lying on top of me, my cock still in her cunt. We had a quickie in the morning after her alarm went off. I showered with her and went to my room. I shaved slowly and went to wake Kathy. She was snuggled in her bed, and I nuzzled her neck until she was awake. She wrapped her arms around my neck and kissed me warmly. I told her it was time to get up. She moaned and slowly got up. Mom popped in to give us a goodbye kiss and breezed out looking content. Kathy yelled after her, “Watch it, Mom! You have that just-fucked look!”
Mom giggled and stuck her head in the door.
“Thanks for the warning, honey, but I have been just-fucked. I’ll watch it though. Thanks!” She breezed out.
Kathy looked at me darkly, “I don’t know if I can take this. She looked so happy, and I’m so horny! How about a quickie?” I shook my head slowly and pointed at my watch. She groaned and went into the bathroom. I dressed and gathered my stuff. Downstairs, I fixed breakfast and ate. Kathy joined me a little later.
Annie’s outfit of the day was a sweater and a skirt. She had the skirt unbuttoned up to her crotch and no panties. Her pussy looked fresh-shaved and very trim. I was hard, and she was wet before we got up to check the servers. Kathy was teasing me while we checked the servers. I asked Annie on the way out when I could come over, and she said Friday would be best. She whispered that she was very horny. Kathy grinned at her and asked about dancing. Annie said she would have to check the studio schedule. Kathy whispered to her loud enough for me to hear, “I got wet too.” Annie grinned at her and fingered the coffee bean. Kathy giggled, and we went to class.
Trina waved to me and said, “Hi, Mike,” at lunch. Chuck winked at me.
I was walking slowly to my first class after lunch when Maryanne stopped to talk. She held my elbow excitedly and whispered, “Mom took one look at me when she got home and figured out what had happened! She doesn’t know it was you, and I won’t tell her. We had a long, wonderful talk about sex and orgasms. When I described my orgasms, I think she suspected it was you. How many guys are there in this town who can turn a girl on like that? Darn few, Mike! Darn few! You are the only one that Mom and I know.” She giggled and squeezed my elbow. She kissed my cheek quickly, and away she went. There were a dozen classmates looking at me open-mouthed. After all, how many junior computer geeks get kissed in a hallway by a senior beauty queen? It was a first in our school!
Kathy was subdued after I dropped Chuck off. I was feeling guilty when I dropped her at home and headed for Trina’s sister’s apartment. Trina had put a note on the door again. I went in and locked the door. She was standing in the bedroom, posing in a very brief dark blue lace bra and bikini panties. She looked like a Playboy centerfold. She clapped her hands excitedly and told me to get undressed quickly. I didn’t need a second invitation. My guilt disappeared. We were kissing before I had my shorts off. She was very horny. I was on my back with my cock in her cunt before we kissed the second time. She took her bra off as she sat on my cock, her eyes closed and a dreamy smile on her face. I was caressing her tits when she opened her eyes and looked into mine.
“Oh man! I have never been this horny before! I really needed this, Mike! My boyfriend is a dud in the sack.” She leaned forward on my chest and gave me a long, luxurious fuck. She shuddered, and I felt her cunt spasm.
“Jesus, Mike! I’m having orgasms already!” I stroked her tits the way Kathy liked and watched Trina go through a half-dozen orgasms before I ever thrust into her. She was a wild woman by the time I felt my cum start, and she was sobbing when I shot my cum into her. I hadn’t been there a half-hour yet! She collapsed on me, and we cuddled for a long time. She talked about how her boyfriend just wanted to fuck and forget her. I asked if he was affectionate, and she said he used to be. As she talked about him, she came to the realization that he probably had a girlfriend he was fucking at his college, and Trina was a quick fuck on vacation. She giggled, “It was a quick fuck too! He came before I was even thinking about an orgasm! On top of that, he has a little dick!” She giggled again, and her cunt squeezed my cock. I was fondling her gorgeous tits as we talked, and she said softly, “I love the way you touch me. My pussy gets tremors. Can you feel them?” I grinned at her and twitched my cock. I was surprised at how strong it was. She gasped, “Oh God, Mike! Do that again!” I tried harder, and it twitched strongly in her. She stirred her cunt slowly, and after she quieted, I twitched again. I was getting hard again. She tested my cock again and smiled dreamily, “I love the way you get hard in me. I can feel you stretching me. It’s so sexy!” She stirred my cock again, and this time I was hard. She fucked me slowly and shook when she stopped. She looked down at me.
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