Sisterhood

Hey everyone, here's Chapter 04 of Sisterhood 101. This series should be considered a direct sequel to Birthday Pool Party. However, it is my hope that it can also be read as a standalone work. Having already read Birthday Pool Party will greatly enhance the experience, but it shouldn't be required. I hope you enjoy! Comments and feedback are always appreciated! I read every single one. Also, please let me know if you spot any mistakes. I upload revisions all the time, and I will correct any errors that are pointed out to me. Just make sure to be specific so that I can find what you're talking about.

I don't know how long it'll be between chapters, since I have a few other things going on at once. It's my hope that I can do more time skips than I did during Birthday Pool Party. These first few chapters don't cover long time periods so that I could ease new readers into the plot. There are a lot of plot points in this one and I didn't want to overload people with information. Even if you read Birthday Pool Party, this story will have a few new characters in just the first chapters. Also remember that BPP was a coming of age story; the ladies have a past which will become relevant!

Please note that this story is a work of fiction. I might use parody names for pop culture references: including songs, books, movies, and celebrities. However, they are not meant to accurately represent the real people or media. This is a fictional universe. As always, this is a world without STI's, and everyone involved in sexual activity is at least eighteen years old.

-Witty

WARNING: I write slice of life stories, but they touch on some serious topics. As a result, there's a lot to offer, but there's also things some might not like. This story contains elements of incest and it touches on sexual assault. If any of that is going to be a problem for you, you might want to consider a different story. Additionally, the women in this story tend to be very sex positive, if you're not interested in a woman being with anyone but one guy forever... why are you reading a group sex story?

~Marcia Moore~

Friday August 22, 2025

Biology lab started bright and early. I walked into the lab with Ashley and Lexi, immediately noticing the smell of disinfectant. Long black lab benches ran in rows throughout the room, each station set up with goggles, gloves and laminated instruction sheets. I slid onto a stool and set my notebook down carefully, aligning it with the edge of the table so I'd feel settled.

Ashley dropped onto the stool across from me, all long legs and sunny blonde hair. She grumbled tiredly as she leaned her backpack against the stool. Her blue eyes were heavy with exhaustion as she gathered up her hair and put it into a ponytail to keep it out of her face.

Lexi sat down beside me, slamming her backpack onto the table. She was dressed casually in jean shorts that showed off her creamy, lightly-freckled legs. Her red hair was up in twin buns at the top of her head, and she was wearing one of Steven's t-shirts. It was large on her slender frame, so she had tied the hem into a knot, leaving her midriff exposed.

"Too early to be conscious," Lexi grunted.

"Especially for a class that's three hours long," Ashley agreed.

"Kayla's cheer practice started at six," I pointed out. "I think you can handle an 8:00AM lab."

"Kayla's the perfect angel, I'm the slutty redhead," Lexi sighed, placing her elbow on the table so she could rest her cheek on her hand. "Learn your roles."

"Marcia's the responsible one, Hazel's the bitch, what does that make me?" Ashley asked with a raised eyebrow.

"The ditzy blonde?" Lexi shrugged.

"I'm not ditzy!" Ashley growled, glaring at the redhead. "And you're the brat, Lexi, not the slutty red... actually, forget it, you're both."

"You're the outgoing one, Ash," I spoke up quickly.

"I guess that works," the blonde bombshell shrugged as Lexi stifled a yawn with her elbow.

"Why are you so tired?" I asked Lexi. "Didn't you sleep?"

"Woke up horny," Lexi answered simply. "I couldn't get back to sleep so I woke Steven up. Nothing beats 3:00AM butt-sex."

"Must be nice to live with your boyfriend," Ashley sighed. "Josh has a roommate, I have a Marcia. It's been too long, I need some dick."

"Sock on the door?" Lexi suggested. "Or just bang in front of Marcia. She's a Slut-sister, what's the big deal?"

"Can we talk about something else, please?" I requested in an exasperated voice. "We're in class!"

"Ugh, fine," Lexi mumbled, rolling her eyes.

"Did you get a date for the party tonight?" Ashley asked me, waggling her eyebrows. "Maybe Kwan would like another round with you?"

"We decided to be friends," I replied quietly. "I didn't get a date, but Lina is coming with me. She's joining the honor society, too."

"You two sound fun," Lexi teased. "I hope you don't get the cops called on us."

"We're not all sorority girls," I shrugged.

"I'm not really one, either," Lexi responded. "Ashley just keeps dragging me along."

"Well, someone has to join with me," Ashley grinned. "Looks like I'm the only one with a date."

"You even get two," Lexi teased. "You're making Josh bring Derek."

"Josh's roommate needs to socialize more," Ashley explained. "He'll have fun. Maybe. Hopefully. He keeps forgetting how to talk around me."

"Josh was like that at first, too," I smiled. "He learned."

People filtered in all around us, some yawning, some already wearing their own goggles. Josh and Derek arrived together, their eyes scanning the room with interest. Derek stammered while greeting us, a blush on his face. We talked to him for a couple minutes before he found another table while Josh sat beside Ashley.

The chatter died down when Professor Kim walked in with Chelsea Park, the TA for the course. The professor stood slightly to the side while Chelsea was front and center. She was small, but still managed to have a commanding presence. Her blonde hair was pulled back into a tight bun, and her lab coat was pristine.

"Good morning, everyone!" Chelsea called out loudly. "In case you forgot, I'm Chelsea, and I'll be your TA for the semester. Usually it will just be me, but Professor Kim is going to say a few words before we get started."

"Thanks, Chelsea," Professor Kim smiled as he stepped forward, seeming genuinely pleased we were all there. "Welcome to Biology Lab! Some of you are here because you love biology, some of you are here to satisfy the requirements of your major. And the rest of you are here because you were told this is easier than chemistry."

A few people laughed. Lexi snorted softly beside me.

"If you were awake during my lecture, you'll remember I'm Doctor Kim," he continued jovially. "You'll mostly be dealing with Chelsea during lab and I'll only pop in every once in a while. Chelsea is very strict and I'd advise listening to her. Seriously, I'm a little scared of her myself, and I grade her work.

"If she tells you to do something, do it. If she tells you not to do something, don't. And if you think a rule doesn't apply to you..." Professor Kim spread his hands. "You're wrong, it does."

That got a bigger laugh, including from Josh. I noticed Derek sitting at the table beside us, his eyes flicking between the professor and Chelsea. He wasn't very subtle about it. Every time the petite blonde shifted her weight or tucked a stray hair back into her bun, his attention snapped right back to her. Derek was shy around every girl, but I could tell he was developing a real crush on the young teaching assistant. Maybe Ashley could teach him some subtlety. And learn some herself.

"So, we're going to start with a safety video, but first, fun fact!" Professor Kim declared. "Your stomach lining replaces itself every three to five days. Otherwise, your powerful stomach acid would eat through the lining and you'd end up digesting yourself."

"Ew," Ashley made a face.

"Cool," Josh grinned, earning him an eye roll from his girlfriend.

Doctor Kim smiled at all of us. "So if biology ever seems gross, just remember: it's gross because it's doing its job. Okay! Safety video first. Try to stay awake. Chelsea?"

Chelsea dimmed the lights and started the video. We watched as overly cheerful students demonstrated eyewash stations and safety showers. I folded my hands in my lap and worked hard to pay attention. It wasn't easy since I kept getting distracted: Ashley was bouncing her knee, Josh leaned in to whisper something to her, Derek pretended very hard not to stare at Chelsea while absolutely staring at Chelsea.

"Alright!" Chelsea clapped once after turning on the lights. "I know that video made everything look thrilling, but I wanted to repeat a couple of the big rules. First, goggles and gloves stay on during experiments. Second, no food or drink in the lab; no exceptions. I don't care if it's water, coffee, or your emotional support smoothie."

Derek laughed unnaturally loud before blushing bright red.

"See? I told you she was scary," Doctor Kim laughed. "I will leave you in Chelsea's capable hands. If you make it through her lab, I will see you on Monday."

"Nothing worse than a professor who thinks he's funny," Chelsea called out as Professor Kim left. Shaking her head, she started passing out papers to everyone. "Here is a copy of the lab syllabus and a safety contract. The contract must be signed for you to stay enrolled in the course."

"Thank you," I accepted my copy of the syllabus and safety contract, separating them both neatly for review.

"As you are looking over the safety contract, please make note of where the eye wash stations and safety showers are," Chelsea continued in an authoritative voice. "Also notice the dress code. Closed-toed shoes and long hair needs to be tied back."

Chelsea went over safety procedures, letting us know what to do if something spilled or broke. A few people were looking glassy-eyed, but most were paying attention. When the speech was finished, we all signed our safety contracts and handed them back to Chelsea. She made sure to tell us there was a copy of the contract attached to the syllabus in case it was ever needed for reference.

"For today, we will be getting familiar with our stations and do some practice measurements," Chelsea explained. "No chemicals or experiments or dissections. Just learning what things are and how to properly record data."

I nodded along, making sure to memorize every word.

"You will have a lab partner you will perform experiments with, and while you will share the same data, you will each be responsible for writing your own lab reports," Chelsea announced while looking at a clipboard. "I have assigned partners. I'm doing this for two reasons. The first is that you rarely get to choose who you will be working with in your professional career. The second is that this is college, you should get out there and meet some new people."

I looked over at Ashley with wide-eyes, she just shrugged and smiled, clearly unfazed.

"First up," Chelsea said loudly, "Alexis Davis and Jade Kim. Same last name as the professor, interesting!"

"N-no relation," Jade squeaked. She was a tiny girl with black hair in a bun.

"Oh, we know her!" Ashley leaned in and whispered.

"We do?" Lexi frowned.

"She's pledging Dalta Tau Chi with us, dummy," Ashley explained.

"Oh," Lexi said, looking at Jade and clearly trying to place her.

"Next we have Ashley Bartlett and Derek Alvarado," Chelsea listed as Derek gasped.

"I guess we're partners!" Ashley said loudly, waving to Derek.

"Y-yeah, uh, hi, um," Derek blushed. "Yeah, partners."

Chelsea listed a few more names before reaching a name I knew. "Josh Greene will be working with Leah Roberts."

Josh waved politely to a brunette of average height. Leah waved back shyly, and I could tell she was a quieter person than even I was back in high school. The girl was pretty, with light skin and green eyes, but she was also wearing frumpy clothes in an effort to conceal a couple of extra pounds.

"Last, but not least," Chelsea declared after listing several more pairings, "Marcia Moore and Matthew Carter."

I looked over at a cute guy with blond hair and freckles. He blushed slightly when he caught my gaze, waving at me nervously. I waved back and smiled, feeling relieved. Matthew seemed shy, not at all like some asshole who would just try and get in my pants all semester. Plus, he was cute.

"Okay, that's everyone," Chelsea smiled. "We might change things up later, but expect to work with your partner for a while. I'll give you a few minutes to introduce yourselves. Please move accordingly."

Ashley squeezed Josh's hand and kissed his cheek before standing. Derek's eyes were wide as the tall blonde sat beside him and immediately started talking. Lexi and Jade were getting to know each other, and I saw Leah shyly sit beside Josh. I gathered my things and took a seat beside Matthew.

"Hi, I'm Marcia," I introduced myself. "Undeclared."

"Matt," he smiled as Chelsea placed a packet in front of each of us. "Biology."

"Oh!" I gasped slightly. "I hope I don't slow you down."

"Don't worry," Matt grinned. "Professor Kim was right; this is easier than chemistry."

"So easy even I can manage?" I arched an eyebrow.

"No, no! I ah, I didn't mean..." he stammered.

"I'm teasing," I giggled cutely.

"Okay, good," Matt let out a breath.

Chelsea clapped once from the front of the room. "Alright, scientists! Open your packets. Today's lab is called 'Measurement and Observation in Scientific Practice.' Exciting, I know!"

A few chuckles rippled through the room.

"You'll learn about three stations at your bench," Chelsea said. "You will measure mass using the digital balance, then volume using graduated cylinders and pipettes, and finally length using calipers. Record everything with proper units. Significant figures and estimated digits matter. If you don't know what those terms mean, you're about to find out. Begin!"

We all flipped through our packets and started reading.

"Station one," Matt mumbled quietly. "Measure the mass of three unknown metal cylinders."

"Ooh, we get mystery objects," I giggled.

"Labeled 'A,' 'B,' and 'C,'" he replied dryly. "Very mysterious."

All around us, students were were examining lab equipment while getting to know their partners. Cabinets lined the walls, filled with glassware, trays, and other lab equipment. I noticed the emergency eye wash station and the shower. Every workstation was identical, with a sink, a balance, and carefully arranged drawers that were all labeled.

"Always make sure it's zeroed," Matt murmured as he carefully turned on the digital balance.

"I like that you narrate your process," I smiled kindly.

"Uh, sorry," Matt blushed slightly.

"No, I meant it," I quickly clarified. "It's helpful."

His shoulders relaxed as he grabbed Cylinder A and placed it on the balance. "Forty-two point three seven grams."

"And it measures mass, not weight," I nodded while writing down the figure.

"Right, it does a calculation based on the assumed gravitational force," Matt agreed.

Across the room, Ashley was giggling at something Derek had said, or maybe at the way he said it. The poor boy's hand was shaking as he held a graduated cylinder like he was afraid it might explode. He kept glancing at Ashley, moving carefully to make sure he didn't bump into her. I felt bad Derek was so nervous, but it really was the cutest thing ever.

"You can relax," Ashley told him. "It's not acid."

"I-I know," Derek nodded, adjusting his grip.

Chelsea approached them, gently pressing two fingers to Derek's shoulder. "Just relax and keep your hand steady."

"Okay," he squeaked, his face bright red.

Lexi and Jade seemed to be working well, carrying on a whispered conversation while recording measurements. Leah was reading instructions carefully, her finger tracing each line as Josh nodded along. She then picked up the third cylinder and accidentally dropped it, jumping loudly when it banged against the table.

"All good," Josh reassured her. "Happens all the time."

Leah gave him a small smile, blushing slightly. Interesting.

"Ready for volume?" Matt asked.

We moved on to filling a graduated cylinder with water and using a pipette to adjust the level. After recording our measurements, we moved on to the final task. The calipers were a pain to use, requiring more coordination to make sure we had an accurate measurement of the metal cylinders. By the time we finished, my data table was immaculate. I loved looking at how neat and organized it was. Matt's wasn't bad, though his handwriting was a little messier than mine.

"Good," Chelsea nodded, her arms crossed as she glanced at our notebooks. "Units included. Proper sig figs. You two are fine."

Our TA continued her walk through the room, making comments and correcting errors. Lexi and Jade were doing fine, so were Josh and Leah. Derek had spilled some water, and Ashley was helping him clean up while he continuously apologized, his face so red I was surprised steam wasn't rising off of him.

"It's okay," Ashley was saying, "we're not growing alien parasites."

"Yet," Chelsea added dryly as she passed.

"W-what?" Derek looked over as Ashley laughed.

"For next time," Chelsea called out, "there's a short reflection at the back of the packet. Answer the questions about sources of errors and why standardized measurements matter. That will be due at the start of next lab."

I flipped to the last page. "What is the most common source of errors in measurement?"

"Human beings," Matt answered instantly.

"Oh yeah?" I glanced up at him.

"Rockets don't blow themselves up," he shrugged. "Humans are dumb."

The Commons was much louder than the biology lab, but less intimidating since it wouldn't be grading me. Conversations layered over each other, trays clattered against tables, and the scents of fries, pizza, and tacos mixed together to make my mouth water. Sadly, I'd be going with my usual salad for lunch.

Lina Ramirez stood in line with me, both of us clutching our phones.

"I always panic in here," Lina admitted while adjusting her glasses. "There are so many options."

"You said you loved their turkey wraps and got them every time," I smiled.

"I like consistency," Lina giggled.

"I've noticed," I replied.

Lina was even smaller than Lexi and me. Petite, soft brown hair pulled back into a ponytail, glasses slipping down her nose whenever she looked down. She was careful, reserved. The type of person who blended in with the crowd, but was always watching and listening. Someone observant. We were exactly alike.

I grabbed a freshly-made salad while Lina chose a turkey wrap. It was lunchtime, so the seating area was crowded, but we managed to find a small table near a window. Sunlight spilled across the table as I placed my salad down and smoothed out my napkin across my lap.

"So," Lina said, tucking her legs beneath the table, "how was bio lab?"

"Structured," I answered while pouring dressing over my salad.

"That's the most Marcia answer you could've given," Lina giggled.

"I guess you already know me," I smirked. "We just practiced measurements. No chemicals or frog guts yet."

"Disappointing," she sighed and shook her head. "Not one explosion?"

"Not even a little one," I confirmed.

Lina nodded and took a bite of her wrap, chewing and swallowing before speaking. "Did you pick a partner?"

"Partners were assigned," I explained. "He seemed nice. Biology major."

"Cute?" she asked, failing in her effort to sound casual.

"That's not relevant," I replied, feeling heat in my cheeks.

"That' wasn't a 'no,'" Lina observed.

"Enough about me, how are your other classes?" I asked.

"Pretty good, no complaints," she answered. "No cute lab partners for me, though."