Science Affair
Copyright© 2025 by Anonymous
Chapter 4
Young Adult Sex Story: Chapter 4 - 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 somebody knocking on the door, and Kathy was saying, “Yes, mother! I’m awake! I sat bolt upright. I looked at Kathy and tried to gather my wits.
“Get into your room!” She whispered as if she were telling an idiot. I suddenly realized what was happening. I hopped out of bed and ran through the bathroom into my room. Mom was knocking on my door, and she was peeved.
“Mike! Answer me this minute!”
“Sorry, Mom, I’m awake.” I was trying to sound sleepy, not out of breath.
“I swear! The older you get, the harder you are to get up!” She stomped off down the hall, and I sat on my bed to calm down ... Kathy stuck her head through the door and asked me to wash her back. She had started the shower, and we got in together. She wet her hair, and I rubbed her shampoo in. It was neat washing her hair. It seemed such a personal thing to do. She was humming as I did it, and once in a while, her slick, soapy ass would brush against my cock. It started getting hard, and Kathy felt it. She pushed her ass against it and wiggled against it. It rose up between her legs, and she wiggled her thighs. I was still soaping her hair, but it was getting harder to concentrate. I pushed my cock forward against her pussy, and she spread her legs a little. My cock slipped between her pussy lips, and I started stroking in and out. Kathy spread her legs further apart and placed her hands against the shower wall. My cock must have been stroking her clitoris directly because she got real slick fast. After a couple of minutes, I pulled back a little further, and it found her hole. I grasped her hips and pushed it in further. She bent over further and kept her hands against the wall. I started stroking faster. I reached under her, cupping her slick tits in my hands, then I started pinching and pulling her nipples. She responded with a groan and pushed back against me as I pushed in. We were going pretty well now. I brought my left hand down her belly and through her bush to the top of her slit. Her clitoris protruded, and I rubbed it lightly with the tip of my finger. She pushed back harder when I thrust into her. I set up a rhythm of brushing her clit when I pushed in. Several more strokes, and she was starting to shake her ass against me when I was in. The shaking caused my finger on her clit to rub it harder. She was telling me to push harder. I was more than ready, and I really started pounding. My cum was rolling in my balls, and Kathy was shaking hard now. I gave two more thrusts, and I started blasting into her. Over and over, I pumped cum into her, and it finally stopped. Kathy raised up, and my cock popped out of her. She turned to me and threw her arms around me and kissed me. Her warm, slippery tits rubbed against me, and I started having thoughts of round two. Then I realized we had school today, and Mom was getting dressed down the hall.
“We had better hurry,” I said into her wet, soapy hair.
“Darn!” She must have felt the same as I about round two. She stepped back under the spray, and I rinsed the soap out of her hair. I soaped her tits, back, ass, pussy, and legs. Then I got to run my hands all over her slick, soapy body as I rinsed her off. I got a few kisses and licks to her tits in the process. She laughed when she slapped a slick breast against my lips. It was fun, but it had to stop. She stepped out to dry, and I finished quickly. I stepped out to dry as Kathy sauntered by, giving my now limp cock a little pat. I shaved and brushed and went into my room to dress. Kathy had closed the door to her room. I gathered my books and papers and went down to breakfast. Mom was dressed for work in a smart suit and a conservative blouse. She would show no jiggling tits for the office today. Her eyes were sparkling, and she gave me a cheery kiss and hug. She looked like a new woman. The wonders of good fucking! Kathy came down as I was eating my cereal and toast. She was sparkling-eyed too. Mom gave her a cheery kiss and hug too.
“Boy, Mom! You look great today!” Kathy smiled at her.
“Oh, I feel great!” Mom was as enthusiastic as I remember her ever being.
In a reserved voice, Kathy warned,
“Better cool it a little today, Mom. Somebody might wonder what’s up.”
Mom looked at us inquisitively.
“Does it show that much?”
Kathy and I looked at each other, and we both chorused a loud, “Yes, Mother!” We all laughed and settled back into the routine of breakfast and cleaning up. Mom reminded us to come right home after school. We chorused.
“Yes, mother!” She kissed us, and we headed out the door. On the way to Chuck’s, I suggested we act normal with him, and if the subject of Mom or sex came up, we would be honest with him. Kathy thought we might suggest to Chuck that he and Kathy date each other once in a while. That was a really good idea. I thought we could double date or something.
Kathy warned me, “Don’t stick my cock in some whore.”
“I love you alone, babe.” I meant it! I kissed my fingers and touched her lips. We pulled in front of Chuck’s, and he came running to the car. Kathy slid over to the middle, and he got in.
“Morning, stud!” Kathy’s greeting caused him to smile, and she hugged him. As we drove to school, Kathy told him that maybe they ought to date once in a while to divert attention. Chuck smiled and thought it was a cool idea. We parked, and walking into school, Kathy held his hand. Several heads turned at that sight. Chuck and I parted with Kathy, and we went to Miss Monroe’s room. She still looked hot to me, and I was wondering if she came like Kathy did. We gave her the drawings and a brief explanation. She was excited about it and gave us both an excited tits-in-the-chest hug again. This time, I hugged her back.
“Let’s discuss it further during Study Hall.” She was smiling, and I could see the gears turning behind her eyes. We gave the servers a quick look and made it to class on time. Study Hall was the next-to-last class. Chuck and I got our passes from Mrs. Aronson and went to Miss Monroe’s room. Miss Monroe came around to the front of her desk as Chuck and I sat in front of her. She leaned her butt against the desk and put her arms down for support. Her breasts were thrust against her blouse, and the nipples were clearly outlined. She talked as if we weren’t staring at her tits, but her nipples were getting hard. She knew, and I knew. She had a twinkle in her eyes, and I’m sure I did. She told us to determine the accuracy of our measurements by calculating the deviations in measurements of the same subject. We needed to know the repeatability of the measurements. She suggested we measure the subject three times, and if there were significant deviations, we had to refine the accuracy. She also suggested we measure as many unrelated subjects as those that were related. I asked if we should include different body types, and she pondered that for a minute. During the pause, I looked closely at her tits, and I saw her stomach ripple. Was Miss Monroe getting turned on? “I don’t think seriously overweight subjects should be used. The extra body weight could distort the measurements.” She wiggled her leg in and out as if she was squeezing her thighs together.
I had been thinking about a way to sort the measurements to determine mathematically those that were genetically similar. I brought up the idea, and Miss Monroe clasped her arms under her breasts and squeezed them together a bit. Her nipples were definitely hard! I picked up one of the drawings and stood to show it to her. I was getting a hardon and she may have noticed it. I stood to her side and pointed at the lines connecting the coordinates.
“If we summed the lines or summed the angles, we might get a significant deviation between unrelated subjects.”
“I was leaning toward her. She placed her hand on my arm. It was very warm, and she squeezed it. She smelled like my wet dreams.
“That’s a wonderful idea, Mike!” Her hands were back on the desk now, and she seemed to be pushing her tits toward me.
“You might be able to determine probabilities of random subjects being related.” She was excited by the idea, and her thighs were definitely squeezing rhythmically.
I gathered my courage and asked the question I was dying to ask.
“Miss Monroe, would you be one of our subjects?”
Her forearms came back to squeeze her tits, and she smiled at me.
“Sure, I’d be honored.”
“Should we take your measurements here?” I was hoping she would say no.
“Why don’t we do it at my home? It’s convenient to school, and we won’t be disturbing your parents.” She leaned forward a bit and crossed her ankles. The free foot was wagging back and forth like a metronome. It must have been keeping time with her pussy squeezes. She gave her address to us, and we settled on tomorrow after school. We would meet her there. Chuck stood, and Miss Monroe kept her hands on the desk. My dick was tenting my pants pretty good now. I didn’t try to hide it. If she was proud of her tits, I was proud of my dick. We walked out, and she was still leaning back, watching with parted lips, when I looked back. God! She was hot! Out in the hall, Chuck was laughing about her tits. I don’t think he had understood the hidden agenda.
After school, we dropped Chuck off at his house. I explained that Mom had given us some errands to run before she got home. We went into the house, and the answering machine was blinking. It was Mom. She told us Kathy had an appointment with a gynecologist at 4:00. It was with a Dr. Metz, and she was in the same building as our family doctor. On the drive over, Kathy was excited to be seeing a gynecologist. It was as if it validated her sexuality. We arrived on time, and after Kathy filled out the necessary form, we waited for a few minutes, and the nurse called her back. It was at least half an hour before she came out. She gave me her perturbed look as she talked with the receptionist, and out the door we went. She was laughing with relief as she explained what had happened. The doctor gave her a thorough pelvic exam, breast exam, blood pressure, blood test (she showed me the bandage), weight, height, and poked and prodded her everywhere. But the worst part was the questioning. How many sex partners had she been with? How long had she been having sex? Had she had unprotected sex? Were her sex partners active with others? Did she know her partner’s sex history? Was she aware of the dangers of unprotected sex? On and on it went. Then the doctor loaded her down with brochures and explained how to take her birth control pills. Since she was already a week and a half into the cycle, she should not depend on the pills to be effective until the next cycle.
I was appalled! “Does that mean we can’t have sex until after your next period?”
She laughed.
“No, silly, it means you have to use condoms! We have to pick up my pills at the drugstore. You can get enough condoms to last us for three weeks.” We parked at the store and went in. While Kathy was getting her pills, I surveyed the condoms. I had not realized there were so many different kinds. I picked out a box of each of three different kinds and took them to the checkout. The girl was my age, and she flirted a little as she rang them up. I paid and went to the car to wait for Kathy. She came bouncing out of the store a few minutes later and hopped in.
“Did you get them?” She asked as she took the bag and looked in.
“Oh, neat! Let’s try one out when we get home!”
“We don’t have much time before Mom gets home.” I was sure we would need more than a half-hour.
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