Disclaimer: I don't own anything except for Rosie

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Lieutenant Commander Rosalyn Moure was sitting on a ledge just outside of Starfleet Academy, poking at her PADD, while trying to finish devising a lesson plan for the engineering class she was about to take over teaching. At just twenty years old, she didn't much like teaching, as most of the students refused to take her seriously. Yes, she was young. She had come to the academy when she was just fifteen to begin seriously studying engineering, after she had built a functioning model of a spacecraft that year and been recruited. She hadn't officially joined Starfleet until she was eighteen, but she was certainly one of the best engineers they'd ever seen.

She sighed, frustrated, and plopped the PADD down onto her lap. She vastly preferred research engineering, where she didn't have to interact with many people. She was a quiet girl, never having been very social. That wasn't to say she couldn't be social when she had to, but she preferred not to. She'd had a few friends here and there in her five years at the academy, but they'd all been older and had moved on to work on starships. Now, the academy had assigned her to take over this class because the current teacher was going out on maternity leave, but they had hinted they felt she could use the interaction with people. Tucking a loose strand of blonde hair behind her ear, she picked the PADD back up and began working again. However, that didn't last long.

A cadet plopped himself down alongside her on the ledge. "Hey," he said, a cocky grin crossing his face. "What's your name?"

Rosalyn tried to keep the frown off her face as she tried to direct her attention back to her work. "I'm busy," she replied.

"Well, that's a weird name," the man replied. "Hi Busy, I'm Jim." He stuck his hand out towards her. "Jim Kirk."

"My name's not busy," Rosalyn rolled her eyes at the guy. Somehow he apparently thought his quirky smile and big blue eyes would automatically win her over. "Seriously, I'm trying to work here."

Before Jim could reply again though, an older, gruff looking man came storming over. "Is my friend here botherin' you, Miss?" the man grumbled in a Southern drawl.

"Indeed," she shot a glance over at Jim as she answered, and it looked like he was pouting. "I told him I was busy."

"Jim, leave the girl alone," the man scolded. "I'm sorry about him. He thinks anything that's female will just succumb to his charms," he apologized for Jim, who still hadn't bothered to leave yet. "Dr. Leonard McCoy," he offered his hand to her.

She shook the doctor's hand, "Rosalyn Moure."

"Nice to meet you," he nodded his head. When he released her hand, he grabbed Jim's arm. "Now, say goodbye to Rosalyn here."

Jim's eyes narrowed grumpily, but he plastered his smirk back on his face when he glanced in her direction. "See ya around, Rosie," he called out as Dr. McCoy hauled him away.

She shook her head, as she glanced back at her PADD, trying to get her focus back once again.

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A few days later, Rosie stood at the front of the lecture hall, placing herself behind the podium so the students couldn't see her nervously wringing her hands. She hadn't taught in almost three years; after what happened the academy hadn't been comfortable letting her in front of a group of people. But now that time had passed, they felt she needed to start trying to reintegrate herself into academy life.

The class was soon to start in just a few more minutes when he waltz in. Jim. Again. Rosie tried to hold back a sigh. "Hey, Rosie!" he called out as he walked to the front of the room. He sat down in a seat right in the front row and kept talking, "Fancy seeing you here. Basic engineering, huh? Easy class. This is the first time I've ever shown up before class and the teacher's not here. Figures. How long do we have to wait for them to show up before we can leave?"

Rosie blinked, baffled. "I'm standing right here, you know." When Jim's eyebrows seemed to furrow in confusion, she continued, "I'm taking over this class for a while."

Jim sat up straighter from his slouched position, "Taking...over?"

"The class," Rosie supplied. "I'm taking over the class. I'm the teacher."

"But...but..." Jim sputtered. "You're so...you..."

"Young?" When Jim nodded, Rosie answered, "Yes. I'm twenty. I'm also the academy's chief research engineering officer. I don't usually teach, but the course's usual instructor is currently on maternity leave as of today. People don't generally make teaching easy for me because of my age, so I'd appreciate a little cooperation, Jim. Okay?"

"Ye..." Jim coughed, "yeah. Okay." He sat back in his chair, clearly trying to process the new information.

"Thank you," Rosie said. Turning her attention to the room, she took a deep breath and steadied herself. Yes, she hated teaching. Yes, it made her nervous. However, she was more than capable of being an effective teacher, and while most people didn't care, the few that did deserved her to give the best lecture she could. She wiped her palms off on her uniform dress before she began speaking, "Hello everyone. I'm Lieutenant commander Moure. I'm sure you're wondering where your regular instructor is..."

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A/N: Thanks for reading! I've been toying with this in my head for years since Star Trek came out in 2009, and seeing Into Darkness this weekend has inspired me to see what happens with it once it's on paper!