Big Little Sister
Copyright© 2025 by OmegaPet-58
Chapter 3: More Developments
Young Adult Sex Story: Chapter 3: More Developments - Sisters Liz and Nat enjoy an above-ground backyard pool, inviting nerdy next-door neighbor Dan to join them. Nat is older, gorgeous, and the high school social queen, while Liz is heavy and feels overlooked. Dan, attracted to both sisters, thinks he has no chance with Nat, and soon he's partnered with Liz. Dan and Liz's deep intimacy is encouraged by Dan's single (and swinging) mother and the sisters' father. A simple teen romance explodes into lusty combinations.
Caution: This Young Adult Sex Story contains strong sexual content, including Ma/Fa mt/ft mt/Fa Fa/ft Mult Teenagers Consensual Romantic Lesbian BiSexual Heterosexual Fiction Humor School Sharing Incest Mother Son Sister Father Daughter Group Sex Anal Sex Exhibitionism First Flatulence Massage Sex Toys Voyeurism BBW Big Breasts Hairy Public Sex Size Nudism
“Dan, calm down,” Mom said. “Move your hands; don’t hide yourself.”
When I heard her name, I reacted on instinct, cupping over my wet cock.
“Why?” I croaked.
“Because Liz and I like to look, dope. You know very well my history, Son. My first time was horrible. The only good thing that came out of it was you. I couldn’t resist watching your first time together. The first experience I never had. Oh, except, Liz?”
“What?” Liz asked.
“It’s better if you say it, Liz.”
What was Mom getting at? Liz shook her head and pushed her hair back away from her face.
“I don’t think so, Irene.”
I just blinked at Liz, then looked back at my mother.
“Mom, I just had the most wonderful experience! What is it you want?”
“I know it was your first time, Dan.”
“What? I don’t...”
I ground to a halt. Then I began to “get it” and I stared at Liz, who looked uncomfortable.
“Dan, it was my first time, yes. But also, uh, no.”
“Liz, don’t tease me. What do you mean?”
“Yes, with you was my first time with a man.”
“Who was she?” Now I understood now what Liz was not saying.
“I don’t think I should tell you. I should go.”
“Elizabeth, no. I’ve been honest with you, always. Was it your sister?”
“Dan, no. No! It was my friend Laura. I expect you two to keep this a secret.”
“Of course we will. Right, Mom?”
“I promise. Liz, don’t worry about it. I think lots of girls have sleepovers and try out kissing with their close friends, and things heat up from there.”
“Wait a minute!” I had a sudden thought. “Yolanda Mitchell?”
“Who’s Yolanda?” asked Liz.
“Mom has ‘sleepovers’ with her. Many times. She’s like, ten years older than us. Wait, isn’t Yolanda married?”
“She is, Dan. That’s why sometimes I have sleepovers over at the Mitchell house while you get paid to babysit their 6-year-old daughter, Lisa.”
I covered my face with my hands. If there was a hole in my bedroom floor, I could go hide in it and pull the wall-to-wall carpet over my head.
“Of all the days of my life, you pick today to come in here and watch me have sex for the very first time? And then you tell me that you’re having sex with both the mother and father of the little girl I’m babysitting? Liz, I’m so sorry ... Why are you giggling?”
“Dan, did you enjoy fucking me?”
“More than I could ever have imagined. Why?”
“I’m laughing because I can come to your door any time, ring the doorbell, and ask, ‘Mrs. Nickson, can I play with your son or have a sleepover?’ And Irene will welcome me inside and show me where I can hang up all my clothes. How many girls in our school can say that?”
“Why would you come here when you can ‘play’ with Laura?” I curled my fingers to show “scare quotes” around “play.”
Heavy sigh. “Laura doesn’t have a cock, Dan. A warm, wet, living, and delightful dick like yours.”
“Don’t forget, ‘delicious,’ Liz.
“I really haven’t tried him yet.” I guess Mom didn’t see how I splattered Liz’s tonsils only thirty seconds after we climbed the stairs. “Hey, Irene, do you want to be his first?”
“Holy shit, Liz, you’re very open-minded. But I don’t think I can afford all the psychiatric help he would need afterwards, and both Yolanda and Bobby Mitchell satisfy my oral cravings. I do enjoy dining at the ‘Y,’ Liz.”
Mystified, I asked, “Dining at the ‘Y’? I don’t get it.”
“Liz, show him.” She drew straight up between her legs from her knees to her crotch, stopped, then traced the two creases between her groin and her thighs, combined to indicate the shape of a capital Y.
Now, I understood.
“I guess we need to teach him, you know, point out the local landmarks,” smirked Liz.
I croaked out, “We?”
“God! My son is so much fun to tease.”
I tried to sound serious and firm while gritting my teeth.
“Mother. If your curiosity is now satisfied, may I please have some alone time with my wonderful girlfriend?”
“Of course, son. Just one thing before I go.”
Mom walked up on Liz’s side and kissed her on the lips open-mouthed while groping her tit and gently twisting her nipple.
“Come down before 7:30 and I’ll make you breakfast. Remember, Barry said you have to go home and change in time for school.”
I said, “I don’t want her to change. She’s perfect just the way she is.”
Liz giggled, but Mom said, “Oh, barf,” and left us alone. Finally.
“Dan, I know she teases you, but she really loves you. It’s so obvious. I think I’m jealous.”
“Sweetie, I’m jealous of Laura; she knows all the ways to please you. She knows the menu when she dines at the ‘Y’ and I don’t.”
“Hey, I’ve got an idea. Let me bring Laura over here in a couple of days. She can be your instructor and then proctor your final oral exam. If you pass, I’ll lend you to her as a graduation present.”
I suppose Liz thought her offer would appeal to me, but I was just confused.
“Wait a minute. Laura is a lesbian. I’m sure she thinks I’m crude and rude, and my genitalia are weirdly repulsive and smell like sweaty feet.”
Liz just stared at me. “Dan, you need to slow down and THINK. Irene just explained to you that she has sex with both Yolanda AND Bobby Mitchell. She’s not a lesbian, and she’s not straight. She’s bisexual—that means she likes both the pointy and the receptive parts. So does Laura, and so do I. You’ve got to calm yourself and open your mind to the possibilities.”
“Wow. I just never...”
“I can tell, Dan. Look, when Laura and I have sex, I put my face in her pussy and she puts her face in mine. The name for that is sixty-nine. I want you to close your eyes and imagine the two of us connected like that.”
“Laura makes you happy, doesn’t she?”
“She makes me COME. So do you. Many other things about you please me, also. You’ll find out; Laura makes a silly little cry when she climaxes. It’s, uh, endearing.”
“Right now, Liz, I’m thinking about you. Not Laura, not Mom, but you. All I want to do is give you orgasm after orgasm. It’s so cool that you can do that.”
“I’ll tell you what. I’m going to set my phone alarm to six a.m.”
“So early? Why?”
“Because, Dan, I want us to wake up together and enjoy a morning fuck, and then squeeze into the shower together and explore each other’s nooks and crannies. I’ve been imagining sleeping—actually sleeping—with a guy for a long, long time. We’re going to be spoons together; that means we’re both on our sides and my ass is tucked into your lap. You’re going to put your arm over and cup my breast like it was your favorite stuffed animal, and you’re going to breathe the faint scent of shampoo in my hair. Understand?”
“I feel lucky, Liz, that you’re here with me.”
We arranged our bodies according to her instructions. When she felt my hard-on prod her, she tucked it between her thighs and up tight against her damp pussy lips. Simultaneously, we moaned, and then she giggled.
“Good night, stud.”
“Good night, sweetie.”
In a few minutes, I heard that Liz had gone to sleep. She snored extremely lightly; it wasn’t at all bothersome. But my mind was racing as I relived my time with her. I remembered how she tossed her head from side to side as I thrust, with our bellies against each other. That look of thrilled lust I’d never seen before, and she watched my eyes as I thrust over and over.
Another vision came, this time of Mom. I must have been pretty young, because we were in the shower together. I was having unfamiliar feelings, and my eyes were looking at her closely, and I felt unusual. What was different? That was the last time we showered together; she looked down and saw my erection, I realized later. She asked me to step out and dry off, and from then on we showered separately. As time passed and I was regularly jerking off, I often recalled the sight of her wet body; I wished we would go back to sharing the shower.
A different fantasy took over. I imagined Liz and I as older—a married couple—on vacation as participating swingers at a special nudist resort. Mom was there too, with Yolanda and Bobby. Out by the pool, the three of them kissed and fondled each other. Elsewhere, I watched Natalie trying to stretch her mouth over her husband’s giant dong. Beyond Nat, three large women with big fleshy asses had lined up together on their hands and knees, while a guy behind them shifted left and right as if trying to decide which ass he wanted to come in first.
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