Science Affair - Cover

Science Affair

Copyright© 2025 by Anonymous

Chapter 18

Young Adult Sex Story: Chapter 18 - 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  

It was Annie’s first day in our house when Mom woke us early for school. Annie was groggy, and I enjoyed kissing her awake. She slowly woke with a smile, and we made love. She got out of bed giggling and saying that she wanted my semen in her when she taught class. She put panties on without showering or washing her pussy, wondering if anyone would be able to smell it that day. We both laughed at that thought. She dressed, and I showered, then I woke Kathy by kissing her awake. She wanted to make love too, but I convinced her we didn’t have time. She grumbled, but got up to shower as I shaved and dressed. Downstairs, Annie and Mom were eating breakfast. I got two more kisses, and I was eating when Mom and Annie left. Kathy came down, and I fed her. On the way to school, Chuck was grumbling about having to go to school and sleeping alone. Kathy commiserated with him. I knew enough to keep quiet. Annie acted normal at school, and I was relieved that the arrangement might work. She told us that she would go to her place after school. I was to pick up packing boxes at a shipping warehouse on the way to Annie’s. Everything was cool until lunchtime when Trina asked me to come to her sister’s apartment. I told her I couldn’t meet her anymore because of my girlfriend. She frowned and asked whom I was going with. I told her that she went to St. Mary’s. She frowned again and told me to let her know if I was available sometime. I stared after her gorgeous ass as she walked away and almost regretted turning her down. I noticed a lot of kids staring at me as I resumed eating. Chuck joined me, and I told him about Trina. He whistled softly and wondered what the world was coming to. I wondered too. I had just turned down a wild fuck with the sexiest girl in the whole school, but not the sexiest woman. Annie was definitely the sexiest woman. Then I wondered if Kathy was sexier than Trina was. I asked Chuck who he thought was sexier, Trina or Kathy. He pondered that for a minute and offered that Kathy probably was. She was almost as pretty as Trina was. Her figure was about the same, and she was definitely hornier. Laughing, I had to agree with him.

It was my day for former lovers. Maryanne stopped in the hallway to tell me her parents were going on a trip to France as part of their reconciliation. I told her that was wonderful, and then she asked if I would like to come over sometime. Once again, I had to lie about my girlfriend at St. Mary’s. She didn’t frown, but I knew she was disappointed. I felt like an asshole. I hated lying.

The day dragged on, and I was greatly relieved when school was over. We went to the warehouse and picked up a big stack of broken-down boxes, old newspapers, and several rolls of packing tape. I had to tie my trunk lid down to hold the stack. At Annie’s, we set to packing up her kitchen stuff. Mom called to see how we were doing and tell Annie that a realtor was coming over. We had several boxes packed and labeled when the realtor showed up. He had gray hair and seemed pretty nice. He explained that he did a lot of business with Mom and he would like to list Annie’s condo. Annie talked to him while we worked on her garage stuff. I was thinking about the whole arrangement. Annie’s move to our house was occurring pretty fast, and she was making a pretty radical life change because of me. I felt a moment of doubt and guilt. Was I worthy, and what about my affairs with others? We would have to talk. We loaded some of her clothes in both cars and moved them into the guest bedroom. The closet wasn’t big enough, so some of it went into mine. I felt a moment of joy when I saw her things next to mine. I hugged her, and we shared a long kiss. That night in bed, we talked about the changes and the commitment she was making. She reassured me that this was what she wanted. I expressed my love in every way I could. I had a few thoughts about Kathy as I fell asleep. She had been giving Annie and me space and time to be together. I would have to make it up to her. I did that the next morning when I woke her. Annie and I had a quickie, and when I woke Kathy, it was with my head between her legs and then a slow fuck. When we finally got downstairs, everyone was gone, and we had to rush to get to school on time.

My workouts continued during the week, and Billie was flirty, but not aggressive. We also moved most of Annie’s personal stuff in. The rest would be warehoused. She contracted with the realtor, and the For Sale sign went up. The phone line was installed, and we now had four phone lines to the house. It was getting crazy trying to figure out which phone was ringing and which was available. Mom ordered a phone system that would indicate which line was ringing and which was available. It was a relief. The system even had personalized voice mail for each of us. Friday, the king-size bed arrived. Annie, Kathy, and I had a great time christening it. Life was good.

We had six more days till our cruise. Steph was still down about us leaving her, and she kept Chuck in bed all day Saturday while the other women shopped for cruise clothes. I figured we would need sneakers, shorts, and tank tops. After all, we were going to the tropics! Mom called me that afternoon and made me get Chuck out of bed. We met them at a men’s store. She had us fitted for black-tie tuxedos. I chafed at the thought of wearing a black “monkey suit,” but it did look sharp. They all exclaimed over how handsome we looked. Whom that wouldn’t flatter? They let us go home afterward while they continued shopping. That night, we went out to dinner at Karen Schmidt’s restaurant. I was getting used to the jiggling tits and exposed thighs of the four women, but it was still fun, and I enjoyed the way they drew attention. They all enjoyed it too. Annie was particularly excited, and it made her even more exciting to be with. She exuded sexiness and seemed very comfortable around us by now. Ms. Schmidt made a visit to our table and recommended some dishes and wine. She enchanted Kathy again.

We all spent Sunday packing up the rest of Annie’s condo and hauling home the items not going into storage. The unusual event that day was meeting Annie’s mother. She came by the condo to check on how the moving was going, and I suspected there was another motive. She was a gray-haired, attractive woman that I guessed was around sixty years old. Annie introduced us all, and I felt her mother was reassured that Annie hadn’t fallen in with a cult or perverts. If only she knew the truth! Mom invited her to follow us to our house and see Annie’s new home. She thought that would be nice, and after we finished loading stuff, we headed home while Annie rode with her mother. I wondered how their conversation was going. Mom and Annie showed her around the house while Chuck, Kathy, and I unloaded the stuff. Mom invited her to stay for dinner, but she excused herself and left with warm good-byes to all of us. Annie was laughing when she told us that we had passed inspection. I asked what her mom thought about the change, and Annie said that she was suspicious, but usually went along with whatever Annie wanted. Mom snorted and looked at Kathy with a raised eyebrow. Kathy protested that she wasn’t spoiled. Yeah, right.

Steph was shacked up with Chuck after Annie’s mom left, and they didn’t appear until Chuck had to go home. Mom gave him a sandwich to eat on the way. Steph was fucking and starving the poor guy to death! She was acting like he was going off to war. We had a pretty good laugh over it. After homework, Kathy, Annie, and I went to bed together. The three of us slept together the rest of the week. Mom slept alone, and she must have been getting horny because she just about raped Chuck when he came over Thursday night before our Friday morning flight to San Juan. The women spent most of the evening packing and worrying about what they might need. My comments about bikinis, shorts, and sneakers didn’t go over well. Chuck and I poured over maps of the various islands and talked about scuba diving, snorkeling, and sailing. I was excited about being at sea, but I tried to be cool about it. It was after 9:00 when the doorbell rang. It was Steph. She was almost in tears and threw herself into Chuck’s arms. She hauled him up to Mom’s room, and we knew we wouldn’t see Chuck until morning. Mom was laughing about the scene Steph would make in the morning. We were all excited when we went to bed. Annie and Kathy kept me up until after 1:00.

“Up” was the operative word. They were insatiable, and I was fucked out when I fell asleep.

Mom woke us at 7:00. For the first time in a long time, I didn’t make love in the morning. They were in a hurry to shower, get makeup on, dress, eat, pack last-minute items, and worry about what was being left behind. Steph had taken a few hours off from work and was clinging to Chuck. The limousine arrived at 9:00, and after we pried Chuck away from Steph, we were off to the airport. The flight to Atlanta, for our connection to San Juan, was on time and uneventful. I was wondering how that little plane could carry the luggage the women had brought. Chuck and I had a modest suitcase each. Mom, Annie, and Steph had two monsters, a dress bag, and carry-ons each. The limo driver had earned a big tip just loading and unloading! We had a two-hour wait in Atlanta, and then we were off. I sat between Annie and Kathy, while Chuck and Mom sat across the aisle. Everyone was excited, and the women talked incessantly. Chuck and I tried to read the airline magazine, but it was impossible with all the interruptions.

San Juan airport was an experience I would sooner forget. The nice part was the weather. It was almost hot, and balmy breezes waved the palm trees. Somehow, we managed to get our bags, a porter, and a limo to the hotel. It only took two hours! Fortunately, Annie knew Spanish, or we might have been there all day. It seemed that everyone knew English except the guy you needed to talk to. It was all pretty funny in retrospect. San Juan was crazy. Traffic was nuts. Mom attributed the way they drove to machismo, and I believed her. It was as if everyone driving a vehicle was playing chicken with everyone else. The only signaling occurring was with the horn and middle finger. Kathy was enthralled, and Mom hid her eyes most of the trip to the hotel.

The hotel was beautiful. It was the first time I saw a hotel without doors. The lobby was like a tropical garden you entered through a portal. After the mania at the airport and the streets, it was wonderfully calming in the hotel. The desk clerk was a very attractive, dark-eyed young woman who was very nice. The bellmen had two carts loaded with luggage, and they led us to our rooms. The rooms were large and looked out on a tropical veranda. It was very plush and nice. The rooms connected, and Mom had the women’s bags put in one room. Chuck’s and mine were in the other. After Mom tipped them, the bellmen left. We immediately shuffled the luggage, Chuck’s in Mom’s room, Annie, and Kathy in mine.

Annie and Kathy wanted to see the city immediately. It was mid-afternoon, and the ship didn’t sail until 10:00 p.m. Saturday night. We had 31 hours to explore. Mom called the concierge and scheduled a tour guide. The guide would meet us in the lobby in an hour. Mom and Annie wanted a drink, so we all put on shorts with tank tops and trooped down to the garden bar off the lobby. It was a scene out of a movie; very nice with lots of flowers, green tropical plants, Spanish tile, and waiters in whites. Mom and Annie ordered tropical drinks while we had Cokes. The drinks came in whole fresh coconuts. We all got to taste them. They tasted of fresh coconut, pineapple, rum, and other stuff. I was regretting I had four years till I was twenty-one. The waiters had been giving the women hot stares that were starting to irritate me. I glared at one of the more flagrant ones, and he seemed to back off. Maybe it was some sort of Spanish code. Our waiter was gracious and didn’t seem to be aggressive. It was a pattern I would get used to in San Juan. I surmised that our waiters didn’t want to jeopardize their tips, but the rest of them were free to pursue the tourist women aggressively. We were still in the bar when a young, slim guy in a white short-sleeve shirt and black slacks approached the table. With a slight accent, he asked for Señora Lange. Mom raised her hand, and he took it and kissed the back of it, introducing himself as Juan Jimenez, our tour guide. Mom blushed when he kissed her hand. She asked him to join us for a drink, and he smiled and thanked her. The waiter brought him a coke as we were introduced. He smiled warmly at Annie and Kathy and gave Chuck and me formal business-like greetings. I think I was beginning to understand a little of the Spanish protocol between the sexes. He was very flattering to the women, and they ate it up. He discussed some of the sites we might visit and asked how much time we had. We agreed that we had up to four hours before dinner. He surprised us a little when he said the dinner hours in Puerto Rico were usually later than we were used to. Most of the natives ate dinner after 9:00 and then they went out for the evening’s entertainment, but most tourist restaurants catered to the earlier hours of the mainlanders. I thought it was interesting that he referred to us as mainlanders.

We all piled into a minivan and he started the tour. We first went to Old San Juan and walked the streets as he pointed out the cathedrals, Governor’s mansion, gardens, and of course the shopping. The women wanted to come back for the shopping in the morning. Chuck and I gave each other raised eyebrow stares. Juan caught it and grinned at us. As we moved around the city, Mom, Kathy, and Annie received lots of appreciative looks from the males of Puerto Rico. It was pretty apparent they were not natives. They were pale-skinned, taller, and had much bigger tits than most PR women. Did I mention that none of the three had bras on? We had been out about an hour when Mom stopped the tour and insisted we get some tanning lotion on. Juan took us immediately to a shop where we slathered on the lotion. I was already getting red from the sun. From Old San Juan we walked to the San Cristóbal fortress. It was breathtaking! I stood on the ramparts and looked out to where Sir Francis Drake had approached the city, decided better of the idea, thus leaving Puerto Rico Spanish. It was pretty amazing to me to realize that the city had been there for 400 years before my hometown existed. Chuck and I wanted to explore the fortress for hours, but we were overruled and left for the Condado district. It was much like any mainland downtown city and Juan pointed out the nightclubs. When he mentioned a “salsa” club, Kathy asked what it was. He smiled and told her it was a sexy style of Latin dancing.

“Sexy” was all Kathy had to hear. We were going to a salsa club that night. He told us of several, and the women decided on one that the locals went to. The next problem was that none of us knew how to dance salsa style. Annie asked him about salsa lessons. He surprised me when he pulled a cell phone out and talked to someone in Spanish for a minute and hung up. He informed us that he had made arrangements for two instructors to meet us at the club tonight at 9:30. Mom asked about the cost, and I was surprised at how cheap the lessons were. Annie commented on it, and he told us that the instructors were his cousins and they were not out to gouge the tourists. The women asked about the attire, and he told them to dress sexy, but make sure their dresses allowed free movement. He told Chuck and me to wear dark shirts and sport coats, black if we had them. Navy blue blazers would have to do. We saw quite a bit of the poor parts of San Juan, and it was pretty shocking to me. Juan assured us that San Juan was much nicer for the poor than it had been even twenty years ago. The education system was pretty good, and school was mandatory, unlike many Caribbean islands. He said the rural parts of PR were often poorer than San Juan, but it was improving too. We bid Juan goodbye, and Mom paid him. He was a pretty good guy.

We cleaned up, and I just had to fuck Annie and Kathy in the bathroom. It was too hard to try and fuck in the shower/tub, so we did it as they leaned over the sink counter with me behind. I managed to get them both off before I came in, Annie. It was decided that we would eat dinner and go to the salsa club without changing. Annie and Kathy put on mini dresses with just panties on under them. They put on high heels with ankle straps.

“For dancing,” Annie said. They both looked sexy with their tits jiggling under the soft material. Mom had put on a top that looked like a bra and a mini-skirt. She had a fresh-fucked look too. Chuck and I looked like a couple of mobsters in our dark shirts and blazers.

Dinner was at the hotel, and the menu was much like the mainland, but with a lot more fish and rice. We had a nice time, and then we took a cab to the club. It was a big place, with a serious dance floor lit with multicolored spotlights. There was a stage for a band, but the music was from CDs, played by a fat guy at the back of the stage. The place wasn’t crowded, and I had the impression that the real crowd would be later. There were several empty tables near the dance floor, and we took one. We got a lot of cool looks from the patrons as we entered. They weren’t hostile looks, just cool, like we weren’t regulars and they knew it. Everyone was speaking Spanish, and when the waitress came, she spoke Spanish. Annie ordered for us, and we had been seated for only a few minutes when a very thin young woman and guy approached us. They introduced themselves as Maria and Dante, Juan’s cousins. The introductions went around, and they pulled up chairs. Maria looked like she was in her mid-twenties, while Dante’ looked a few years younger. Maria had on a black leotard with a tight micro-mini skirt. Dante’ wore a black shirt and pants. They spoke English with almost no accent, and we found out that Maria worked in an ad agency while Dante’ was in college. Maria’s eyes were beautiful, and they seemed to flash in the low light. They competed in salsa dance competitions and taught salsa dancing at a local dance club. I asked about the dance club, and they told me that PR had clubs for almost anything you might be interested in, dance clubs being one of the more common. After the drinks came and we had ordered for Maria and Dante, they took us out on the floor for our first lesson. They requested a particular song from the fat guy, and then they demonstrated the first steps we would learn. Even the basics were pretty sexy. There would be no bashfulness that night! Maria had on black panties, and we saw a lot of them as she danced with Dante’. Annie commented that the basic steps were like a mambo, but there was a lot more sex in the interaction with the partner. I was getting the idea of why they called it salsa. The lessons proceeded for about a half-hour, Maria with Chuck and me, Dante with the ladies. It was fun and even Chuck was getting into it. His lanky shape and the fact that he was almost a foot and a half taller than Maria didn’t seem to bother him after a while. Maria was like a feather in my arms when we danced and her eyes were killers. She could flirt with a hot look better than any of our women. She would flash those hot eyes with serious intensity and then a blinding toothy smile when she got the reaction she wanted. I watched the women with Dante when I had a chance and Annie was definitely the fastest study. She was doing some amazing stuff with him and when she did the splits at the end of a dance, he stood back and applauded. Mom and Kathy were doing pretty good too, but Annie appeared to be as good as anyone else that was dancing.

After a break and drinks, we went out again and this time Maria started working on our style. We were almost fucking her on the dance floor. I started getting hard and when she pressed her crotch against it, she flashed those big eyes and smiled very sexily. The next time we took a break a slim guy in a black suit asked Annie to dance. She looked to Dante and me for permission. We both nodded and she went off with the stranger. We all watched as they danced and the guy spent a lot of his time with his hands on Annie’s body. She was into the flirting like the Spanish girls were doing and the whole effect was very sexy. Her partner escorted her back to the table, strutting like a peacock. I deflated him a little when I stood and held Annie’s chair. He only came to my shoulder. Annie was laughing and excited. She whispered to me that she was going to fuck my cock off when we got back to the hotel.

Annie’s dance with the stranger seemed to open the floodgates. Mom was approached by a young guy, as was Kathy. They both went to dance while I asked Annie, and Maria went with Chuck. Dante came onto the floor with Annie and me. He showed us some advanced moves to try, and we practiced with him through three numbers. We were sweating and tired when we got back to the table. The others were still out on the dance floor. Mom was dancing with a tall guy, and she was into the mood. Her eyes were flashing just like Maria’s, and she would flash a smile when her partner gave her a sexy move back. Kathy was practically fucking a slim guy with a thin mustache. He couldn’t get his eyes off her tits. There wasn’t a local woman that was built like any of ours. Mom, Kathy, and Annie were definitely the center of attraction. More than a few Latin guys were getting rebukes from their Latina partners. Chuck was dancing with Maria, and she was definitely giving him the sexy salsa dance treatment. It was a few numbers later, and we were all back at the table for refreshment. Maria and Dante were part of the group, and we were having fun. Annie asked Maria and Dante to do one of their competition numbers. They protested that there wasn’t enough room on the now crowded dance floor. We insisted, and with smiles, they agreed. Dante went to ask the fat guy for a particular song, and a few minutes later, they stood to dance. They assumed a strut as he escorted her to the floor with his right arm straightforward and her straight left arm on top. They commanded a presence, and the other dancers made way for them. When they started dancing, the floor almost emptied while the dancers stopped to watch them. It was incredible the way they moved with each other. It was totally hot, and they drew lots of exclamations from the audience. When the song ended, Maria’s legs were wrapped around Dante’s, her crotch pressed to his upper thigh. Everyone applauded. They unwrapped and posed for a bow, Maria first. It was amazing that the crowd didn’t resume dancing until they were off the dance floor and seated back at our table. They were both flushed, but smiling their thanks to our applause. Kathy leaned over and whispered to me, “Want to bet that they are fucking each other?” I looked at Maria, sweating and breathing hard, still holding Dante’s hand. I looked back at Kathy and winked. She leaned back to me and whispered, “Wait till we get back to the hotel.” I whispered back that Annie was already hot too. Kathy grinned and whispered something to Annie. They both nodded and looked at me with evil smiles. I grinned back. I felt ready for them. I was horny too. We danced a couple of more hours and after paying Dante, we caught a cab back to the hotel.

We were hot and sweaty. On the way through the lobby, Mom asked if the pool was open and we received an affirmative. The girls wouldn’t let me get romantic while they put on their thong bikinis. I had a time getting my swimming trunks on over my hard-on. Annie giggled that I would have all the women in the hotel following me if I went out like that. I asked her if she wanted to help solve the problem. She grinned at Kathy and shook her head as she told me I would have to wait. Mom was giving Chuck a blowjob when we looked in to see if they were ready. Kathy yelled that was a foul and made Mom stop. Chuck groaned when his cock slid out of Mom’s mouth. Kathy made him put a swimming suit on, but the tip of his cock was above the waistband. She looked at him for a moment and then went to the little refrigerator and took out a cold can of Coke. With an evil grin she pressed the can to Chuck’s balls. He shrieked and tried to get away from her, but she managed to keep it in place. When they stopped, his cock was back inside his suit. Everyone but Chuck and I was laughing. The ladies put the fishnet jackets on and out we went. The pool was in a garden-like area, past the bar and the bar was fairly crowded. Every man’s eye in the place was watching as those three paraded by.

The pool was gorgeous. It looked like a tropical mountain spring. Water was coming off a waterfall at the far end, and tropical plants came right to the water’s edge in several places. There was a bar under a cabana at the side, and a steel band was playing. It was beautiful. All eyes turned when the net jackets dropped, and the three of them stepped cautiously into the water. With giggles and then sighs, they sank into the water to their chins. Chuck and I followed. The water was cool and refreshing. Chuck and I were warned not to splash them; after all, there was an audience. That was my thought anyway. Chuck and I swam to the waterfall and stood under it. It was wonderful to feel the water pounding down over us, but it was just a couple of minutes until it was tiring. The water was heavy, and it wore you down quickly. When we came out from under the waterfall, the women were standing at the edge of the pool closest to the bar, receiving drinks from a waiter in whites. Chuck and I swam over and received tastes from Mom and Annie. The drinks were tall, fruity, and powerful. Kathy was sipping a Coke from a plastic glass. It was then I noticed that all three of them had nipples like pebbles under the little patches of wet cloth. The soft light glistened off the water beading their breasts, giving a very erotic picture. Annie saw my look and said under her breath, “I can’t wait much longer, honey.” I nodded, and Kathy furtively squeezed my cock. They told Chuck and me that a poolside brunch was on the agenda for the morning. They wanted to work on their tans before we went shopping. A few minutes later, we went back to our rooms.

Kathy and Annie were arguing about who would fuck me first as we got to the door. Mom had to hush them for fear someone would overhear. We were naked in seconds. Annie won the flip for first. Without preliminaries, she put me on my back, straddled my waist, and guided my cock into her cunt. She was surprisingly slick. She sighed and leaned down to kiss me sweetly. When the kiss ended, she said softly, “I’ve wanted to fuck you since we got to the hotel this afternoon. That damn salsa dancing just made it worse.” She raised up and, sitting on my cock, told Kathy to climb aboard. With a giggle, Kathy straddled my face and lowered her pussy to my lips. I was looking up when Annie’s hands cupped Kathy’s tits and began stroking her nipples. Kathy sighed and held her hands over Annie’s for a minute. I put my hands to use in Kathy’s slick cunt and on Annie’s tit. We made slow love like that for a long time. Kathy was the first to orgasm. She fell off me to the side afterward, and I devoted my full attention to Annie. I moved my hands over her body like the guy who had danced with her, as I asked her if he had turned her on. She giggled as she said, “I was thinking of your cock in me while he touched me. Poor guy thought he was a stud.” She giggled again and then gave my cock a strong fuck. She shivered and braced her hands on my chest. I stroked her nipples and asked her if she got turned on having all the men in the hotel look at her body. She looked into my eyes and nodded as she fucked my cock again.

“Were your nipples hard at the pool because so many men were staring at them?” She groaned and nodded as she fucked me hard again.

“Does your pussy get wet knowing so many men wanted to fuck you at the salsa club and pool?” She groaned and nodded again, giving my cock an even bigger fuck than before. I stroked her rock-hard nipples and waited for her to make a move. Pussy juice was dribbling over my balls when she opened her eyes and looked at me feverishly.

“Fuck me, honey. I really need you to fuck me.” She slid up on my cock, and as she came down, I arched into her. We started fucking smoothly, and the perfect rhythm was in control. She gasped, and I felt her cunt nip my cock. The fucking continued for several minutes, at a steady pace, until she urged me faster with her hands. Gradually, we picked up speed, and we were fucking each other hard when I felt the strong surge in the base of my cock. I warned her that I was getting close, and she picked up her intensity. She was sobbing and shaking her head when my cum blasted up my cock and into her. All I could do was cry out as I came hard. The red fog settled in, and I collapsed. Afterward, we snuggled and kissed for a long time.

 
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