The first time Doujou Sayuri heard the name Kasahara Iku she had just come home from spending New Year's with a friend from college.

Apparently her brother had brought his girlfriend over for the holidays to meet their parents. Sayuri snorted water up her nose when her mother told her. Atsushi had a girlfriend?! How many years had it been? The last girlfriend he had, if she remembered correctly was back when he was in college. Sayuri couldn't even remember her name. It was a nasty break-up though, they always were. The girl would be hurt and upset and so angry, it was entirely her brother's fault. Often times it was the girl who asked him out and he would agree just for convenience sake. But Atsushi was always more focused on school or work, heck! He cared more about the next book in the series he was reading than he did about his relationships. The girls would eventually realize that they were never anything special to him and leave. Literally, his longest relationship lasted two months, that's it. They were never very serious and he was never particularly upset when they ended. He honestly just didn't care.

That's why Sayuri was inclined to laugh at this news of her brother's new relationship.

She wondered how long this one would last. But the conversation turned somber when her mother said soberly "He seemed rather serious about her. I think he really likes her." Her father, seated on the couch, snorted from behind his magazine. "I'll say he does, just the way he looked at her!" Both her parents laughed. Sayuri's eyes got as wide as saucers. Did Atsushi really like this girl that much? Her mother ruffled her hair gently and nodded. "I really think he intends to marry her. Well, he didn't say that specifically but, well you know Atsushi." Had she still been drinking she would have choked. Marriage?! Seriously Atsushi?!

A few days later Atsushi came over for dinner.

"Long time no see he said cheerfully, ruffling her hair.

"Damn straight" she spat bitterly, scowling up at him. At 150 cm (4'11'') Sayuri always seemed to be looking up at people.

Her brother usually came home for dinner 3-4 times a month, sometimes even more often depending on his work schedule. But Sayuri hadn't seen her brother for well over three months. Atsushi just smiled at her waspish words and Sayuri's scowl got deeper. Why was he all happy-go-lucky?

No sooner had they sat down to eat than their mother, with a teasing sparkle in her eyes, asked Atsushi,

"So, how is Iku-chan doing?"

Sayuri watched as her brother stiffened and swallowed his food.

"She- she's fine. Great actually. Um- she says 'hi'"

Was it her imagination or was he blushing? Oh god! He was!
"You should have seen her the other day. A kid had gotten lost and the librarians couldn't get him to stop crying."

Sayuri watched her brother's face light up as he talked about his girlfriend and how she miraculously stopped the kid from crying. Sayuri had to resist the urge to gag.

"So how'd you two meet?" she asked, interrupting her brother.

Atsushi suddenly turned awkward, his face practically screaming "don't ask about that!" He cleared his throat, his eyebrows drawn low, all traces of his previous smile gone, replaced with the too-serious face he always wore when he was uncomfortable.

"Well, we both live on base..."

Sayuri raised a suspicious eyebrow and Atsushi seemed to realize that that wasn't going to cut it and his shoulders slumped slightly.

"She, well, she-"

He darted a quick glance at their parents who were studiously ignoring both of their children while trying to hide their grins, and doing a very bad job of it.

"She was one of my students when she was training okay!" he yelled suddenly and started shoving his food into his mouth.

"Wait, wait, wait. You started dating one of your students?!"

"What? No!" Atsushi scowled, he seemed very uncomfortable.

And was it her imagination or did her dad's smirk get bigger?

"No, it's not like that. I was her instructor back when she first joined. That was, what? Three, four years ago?"

"So how long have you guys been dating?"

"Um, a few months"

Sayuri mentally shook her head at her brother. He'd only been seeing this girl for a few months and he was already thinking about marriage? Way to rush into things Atsushi.

"Wow, do you keep in contact with all your students that long?" Sayuri asked sarcastically.

Atsushi got even more uncomfortable, his ears turning bright red.

"Well, no"

"So how do you know her?"
Atsushi swallowed nervously. Glancing quickly at his sister, then back at his plate he mumbled that she was in his squad. Sayuri frowned, processing this. Wasn't Atsushi his squad's leader? She remembered him telling them about it a few years ago. But wouldn't that mean-

"She's one of my subordinates."

"WHAT THE HELL ATSUSHI?!" she yelled.

It all made sense now. Why her brother stopped coming over for dinner- his nights were otherwise occupied. That's probably why he seemed so happy to. That bitch was seducing him! Damn her simple-minded brother!

"God Atsushi, get your head out of the clouds. She's just sleeping with her boss!"

"Sayuri," he yelled with a warning edge.

"What?!" she yelled back. "Really Atsushi, that slut's just sleeping with you because you're her boss, that's it"

Next to her, her mother looked horrified and her father was scowling at her. They always did that whenever she so much as brought up the idea of sex. But it couldn't be helped this time, she absolutely had to get her brother out of this. He was too simple and good-hearted to see that slut for what she really was. Part of her smiled at the thought of getting her brother back. Maybe after this was all over she'd finally see him again.

"YOU DON'T KNOW WHAT YOU'RE TALKING ABOUT SAYURI!" Atsushi yelled at her, standing up furiously.

"DAMN STRAIGHT I DO!" she yelled back standing up to.

"YOU DON'T EVEN KNOW HER!"

"I THINK I KNOW ENOUGH!"

"SHUT UP! JUST SHUT YOUR DAMN MOUTH!"

Sayuri felt like he just slapped her. Holding back her tears, she ran to her room, not even bothering to pick up the chair she knocked over.

Laying face down in her bed Sayuri cried into her pillow. It wasn't because he yelled at her, she was kind of used to that. But it was the first time he'd ever been so angry that he told her to shut her mouth.

Author's note;

My first fic ever so please tell me what you think. Even if you just read it and you just write a review "hey i read this to the end" and that's it, it will make my day.

So, yah, Sayuri is Doujou's little sister. She's about 20 here. I liked the idea that she would be different than Doujou but a lot like him at the same time. For example she's more social and thinks she knows more about the world, but really she's a very simple, stubborn person to.