A Seven Days Girl

By: Tsuki no Shijima

Summary: Hiro screams loudly one morning, terrified to see that he has changed into a "girl". Now, he must tries to spend his time as girl until God-knows-when while his older brother and friends are trying to solve this problem.

Inspired from the story of "Girls Just Wanna Have Fun" by SaturnXK.

Disclaimer: I don't own Big Hero 6.

Warning: Beware of typos and bad grammar. English is NOT my main language. I have this bad habit of not realizing my mistakes on my stories until days or even months after publishing the story.

-oOo-

Day 6

Finally, after three days full of moodiness and pain, Hiro's period had ended. She felt so light. No more cravings. No more mood swings. And most importantly, no more pads!

Tadashi had gone to campus around three hours ago. And since she felt bored, she decided to go to the 'nerd school' to visit her 'nerdy brother'. She chuckled at the 'nerdy brother' part. The mega nerd of San Fransokyo. Nerd king of all nerds in the whole world.

She got in a tram and looked outside. The surrounding was always busy and crowded. Not that she care. But it looked different from a girl's perspective somehow. Like how clothes stores and food stalls lined up on the roadsides. Yeah, girls liked going for shopping.

Oh, she found an interesting food stall there! She saw some people holding the food they bought from that place. They looked really delicious! She wiped her drools. Maybe she could ask Tadashi to buy something there when he's done with his classes.

-oOo-

Unfortunately, the good mood she got a while ago suddenly vanished. Replaced by anger. Or maybe jealousy? She couldn't really describe how she felt right now. Right in front of her, she saw Tadashi, her dearest big brother, with a girl.

That girl was clinging on his left arm. It seemed that they were talking about something. And laughing. They looked happy. But it boiled her blood at the same time.

'Who the hell is that girl?! Is she flirting with Tadashi?!' she scowled in her thought.

She secretly followed them from behind and tried her best to not get caught. Though she was pretty sure she kinda looked suspicious there. When they were near a branched hallway, they departed. But that flirtatious girl did something that made Hiro wanted to punched her hard. That girl kissed Tadashi's cheek before she left with a giggle.

That girl kissed her big brother!

How dare she to kiss her big brother like that!

Even though just on the cheek, Hiro didn't like it. And her giggle, it sounded like a wicked witch voice to her. No, no, no. Tadashi must not have a girlfriend! At least, not so soon.

-oOo-

"Tadashi!" Hiro called out as she ran toward Tadashi.

Tadashi who was just about to open the lab door, turned around with a surprised look on his face. "Hiro? What are you doing here?" She raised her eyebrow, "What? Can't I visit my big brother here?"

He shook his head, "Not that. You're still having your period. I'm sure your abdomen still hurt. You need rest," Tadashi told him, worry was evident on his face.

"Don't worry about that. It's already finished. No more pad me so yaaayyy!"

Tadashi chuckled and ruffled her hair, "Good for you, then. But please don't say the pad thing that loud because we're not the only ones here."

Realization hit her. She gulped and turned slowly. He was right. There were some guys around them, looking at her. Some looking at her weirdly, and some others with reddening face. She blushed and immediately pushed Tadashi really hard into his private lab so she wouldn't embarrass herself more. While her brother just laughed at her.

"It seems that you're having fun," Hiro grumbled, emphasizing the fun word.

"Aaawww," Tadashi cooed, "Don't sulk like that, little sister. I'm not having fun with your embarrassing moment earlier. But it was funny. Next time, look your surrounding first before saying private things like wearing pads."

"Hhmmph!" Hiro pouted as she looked away. "By the way, I think I saw you with a girl earlier. Who's she?"

Tadashi stopped on his track. "You saw us? Well, that's just Linda. I shared one of my classes with her."

"And the kiss?"

That question made Tadashi's face blushed a bit. "You..you saw that, too?!"

Hiro only stared at him with narrowing eyes. She did look unimpressed. Tadashi looked nervous. He glanced down to his mint colored sneakers while rubbing the back of his neck. This made Hiro's anger lit up again inside. But she chose not to show it.

"Well, I kinda have a crush on her. A bit. And I heard she also likes me. But, uh, I don't know."

She didn't like it. Not a single bit.

"What do you see in her actually? I thought your type is someone that looks like me."

Tadashi was taken aback when Hiro said the last part. "Yeah, I know. Maybe because she's a nice girl? I don't really know, though. It's like she has her own charm. Anyway, let's not talk about my love life here. You're still too young to know about that," he said, ruffling Hiro's hair.

"I don't think I'm too young to know about that love thing." Hiro shrugged. Then she looked at her big brother teasingly, "Maybe there will be a time where I suddenly bring my boyfriend to the house and introduce him to you? I could even try to have a date in the café for once."

By the time she finished her words, she felt like she heard a loud thunder. It made her flinch and wondering if it was just her imagination. She looked outside the window and the sky was clear. So how could she hear a loud thunder when it was sunny outside? Weird.

"Hiro…."

Hiro froze on her spot. She turned to see Tadashi. But suddenly, she was pinned to the wall. And, she was trapped between a pair of strong arms, belong to her big brother. The dark aura around him made Hiro gulped hard.

"You," Tadashi started,"..are NOT allowed to have a boyfriend anytime soon. Not without my permission or with someone I don't approve. If you dare to do it, even after I warned you, I will have no choice but to punish you. Do you understand?"

The smile looked wrong. Terribly wrong. It was a sweet smile. But it was also a dangerous smile at the same time. She never knew there was a scary side of his protectiveness.

"I said…, do you understand, dear little sister?" Tadashi repeated, narrowing his eyes to the girl he trapped.

Now his voice sounded deep, and scarier. Even sounded more dangerous than the previous one. Hiro shuddered in fear. With one more gulp, Hiro answered him, "Y-yes, big brother."

Just like that, the scary dark aura around Tadashi disappeared. He smiled again. This time, it was a real sweet smile. As if her answer was the spell to cast away evilness. Tadashi turned back to normal.

He nodded in satisfy, "Good. You're still too young to be in a relationship." He ruffled Hiro's hair before he grabbed a thick book and shoved it into his satchel. "Anyway, I have a class in a few minutes. Stay here, and be a good little girl."

"Hey, don't treat me like a little kid!"

Tadashi only laughed and ruffled Hiro's hair again. Soon, he walked out from his lab. Leaving Hiro all alone.

"Well, I guess I can dig some information regarding the girl who dares to get close to my dear big brother. And let's see if that Linda girl is as nice as how Tadashi said she is."

A smirk on her face, was a sign of something bad would happen anytime soon.

-oOo-

Really, it was a natural thing to see Hiro tinkering with something in Tadashi's lab while the said big brother was having his classes these days. But Gogo found it rather amusing when she saw Hiro tinkering with this evil aura surrounding her. She liked the girl. Totally the type of little sister she would love to have. And if she had that evil aura around her, Gogo knew Hiro had something in her mind.

"Seems like you have something in your mind."

The girl looked up, "Oh, hey, Gogo! Yup, I do have something in my mind right now."

A pop sound came from the gum Gogo was chewing. "Mind to share that something? I have a hunch you got an interesting plan judging from your evil aura."

"What do you mean evil aura?" Hiro tilted her head in confusion. "You might not know, but everyone will see that evil aura of yours eventually. So?" Gogo asked, raising her eyebrow.

"Fine. You know a girl named Linda? She shares a class with Tadashi."

"Yup. Heard she has a crush on your big brother."

Hiro snorted at it, "And Tadashi said he kind of having a crush on her, too. I don't like her! She even dared to kiss Tadashi's cheek this morning! Ugh! It took every bit of my energy not to smack her there with my shoe!"

"Same," Gogo said. "I don't like her, either. She is a bitch. She has this bad habit to date every guy she finds good looking enough, then dump the guy when she's bored with him like the guy is just a piece of trash."

Something clicked inside Hiro's head. Like a switch being turned on. "How do you know this thing?"

Gogo shrugged as she leaned to the door and crossed her arms, "The rumor has been going around for a year now. Well, I happened to have a class with one of her ex, and heard he talked about Linda to his friends. His friends said she had another boyfriend just after an hour she broke up with that guy. Though it only lasted for two weeks before she dumped the other guy and hooked up with another new guy."

She paused for a while, before she added another thing, "I'm not sure if Tadashi knows about this rumor. Even if he does, you know him. He never believes rumors judging other people until he sees it with his own eyes. Your brother is a good guy, too good if I must say. So I guess people might think it's a no wonder if he falls for her and gets dumped like other guys later on. Linda is a two-faced girl, after all."

The room suddenly felt colder. Gogo's eyes widened when she realized what she just said triggered it. Hiro's face turned darker. Clearly, she didn't like the idea of her dearest big brother being played around and dumped like a trash by that bitch. Gogo usually the cool type. But this girl, even though Gogo didn't show it, could make her shuddered in fear.

"Hey, Gogo."

"What?"

"Mind telling me where that bitch usually hangs out?"

-oOo-

The cafeteria wasn't that packed when Hiro entered the room with Gogo following her behind. She scanned the area and found the person she was looking on. Gogo felt like she must stop her before anything bad could happen. Too late, because Hiro already walked away. Gogo immediately texted Fred and told him to bring Tadashi to the cafeteria when Tadashi was back to the lab. Tadashi should be out of his class soon.

While Hiro, she walked to the girl she had been looking and heard her whining around about the assignment she got from one of her professors. "Oh, man! Professor Galle is sure nice. But all of his assignments are so damn hard! Is this even for bachelor degree? I think this one should be a subject for masters!"

"Oh, come on, Linda. You're exaggerating thing. I know it's hard, but you need to study harder if you don't want to fail his class. I'm pretty sure you don't want to meet Professor Granville for the entire summer, right?" her blonde haired friend said.

"Ugh, please no. I don't want to spend my summer studying with her hawk eyes watching me! Geeze, I already have plan to go out with Tadashi this summer."

Her brown haired girl raised her eyebrow at her, "So, you're still into this guy? I thought he's not your type."

Linda rolled her eyes and waved her hand, "Oh, please! He's sooo damn handsome! Good looking, nice, sweet, totally gentleman, I bet he will treat me like his queen if we really date! He's totally my type."

Her friends' rolled their eyes.

"I don't think you're his type, though. He's smart. I'm pretty sure he has a high standard, like dating a beautiful girl with big brain."

"Martha is right, Linda. I think he would date someone like that tall blonde chemist he's really close to. She's got the look and brain."

"Not you, too, Trice. I'm definitely beautiful, and smart! Besides, I'm pretty sure Tadashi has a crush on me."

"What about Josh? You're still dating him," Martha said.

At the mention of the guy's name, Linda snorted, "Oh, him? I'm gonna ditch him soon. I'm bored with him already."

Trice only shook her head, "Again, huh? Anyway, just finish your assignment already."

"Hey, I'm trying! Uugh, I hate this!"

Suddenly a hand grabbed her paper and took it away. "Hey! What are you doing with my paper?!" Linda turned around and shouted at Hiro who was standing behind her.

Hiro examined the paper for a while. Then an insulting smirk appeared on her face. "Oh, wow. I wonder how you even managed to get acceptance to this campus when you can't even solve these simple equations. You are really dumb. And you even want to date Tadashi with that ugly face and small brain of yours?" Hiro snorted at her, "Yeah, right. Your friend was right. You didn't even meet his standards."

Linda's face was flushed in anger, "Who the hell are you?! And don't you dare mocking me!"

When she heard that, Hiro laughed and shoved the paper to Linda's face. Earning a yelp from her. "Oh, I'm not mocking you. But if you really feel that way, then you are really dumb. You dream to date Tadashi when you can't even solve a simple equation? Pfft, yeah, right!"

The woman stood up and pushed Hiro hard, making her stumbled to the back a bit. "I want to date Tadashi or not, is not your business. Oh, I think it's you who dream to date him. Dream on! You're just an ugly little girl compared to me. I can get his heart so easily. I can even make him mine now if I want to. I bet you will cry like a baby if he says yes in front of you."

It's like Linda wasn't aware of her surrounding anymore. A lot of students in the cafeteria were watching them. Albeit they heard the harsh words she said to the little girl as well. Her friends tried to stop her, but to no avail, she didn't. Linda just laughed mockingly at Hiro.

"Don't be so sure about that, bitch. I'm really, really, close to him. Closer than you can imagine. If he finds out about what you just said, I'm pretty sure he would never want to date you."

Linda gritted her teeth. Her anger toward Hiro made her face even redder. Hiro caught a glimpse of someone entering the cafeteria from the corner of her eyes. 'Perfect,' she thought, smirking in her mind. And just like that, Linda slapped Hiro's face hard and pushed her until Hiro fell hard to the ground.

"You damn little bitch! How dare you-"

"Hiro!"

Linda and Hiro turned their gaze toward Tadashi, who stared at them with shock written on his face. Linda and her friends gasped in shock, too.

"Oh, hey, Tada-"

Tadashi ran passed her and went to Hiro's side. "Hiro, are you okay?" Tadashi asked, worried for his little sister. Then he turned to look at Linda and glared at her, "How dare you to slap and push my little sister like that!"

More gasps could be heard. Especially from Linda. "Y-your little sister? But, Tadashi, she was-"

"Dashi, she's so mean to me. You said she's a nice girl. What kind of nice girl is she if she even has the gut to be rude to other person like that? I thought I could be friends with her because I trusted you when you said she's a nice girl. But she slapped me, pushed me down, and called me bitch," Hiro interrupted Linda with her hand on the cheek where Linda had slapped her.

Hiro started sobbing and Tadashi pulled her into his arms. Comforting her in his tight hug. Tadashi carried Hiro bridal style, with Hiro still sobbing on his shoulder while clinging on his neck. He looked at Linda with anger he was trying so hard to control. If he wasn't, he might slap Linda, too. But fortunately, Tadashi was still a good guy even when he was angry.

"Linda, I thought you're a nice and sweet person. Someone I thought I would love to date. I never believed the bad rumors about you here spread by others. But clearly, I was wrong. You really are not even a nice girl. I don't want to get close to a person who hurt my little sister. Not even a date."

After saying his venomous like words, he walked away and went out from the cafeteria while carrying Hiro with his arms. He could hear Linda started crying so loud behind. But Tadashi didn't care. Linda had hurt Hiro. She had made Hiro cry, too. Someone like that was not even worth to date.

"Dashi..," Hiro called him between her sobs.

"Yes?"

"Please.. don't.. date someone.. like her. She's.. so rude to.. me. I don't want.. my big brother.. to date a.. rude girl.. like.. her."

He felt his heart clenched inside him. "I won't. I don't want to date a girl who hurt you."

"Can I.. be.. selfish?"

"Selfish? About what?"

Hiro didn't immediately answer him. Tadashi waited patiently as he opened his lab door and sat on his swirl chair. Still with Hiro in his arms. He rubbed her back, trying to assure her that it was alright to say whatever in her mind right now.

"Please.. don't date. I.. don't want to.. lose.. my big brother. I don't want.. to feel.. lonely. You're.. the only.. one I.. have left. Please…?"

Those words, somehow made Tadashi felt really sad. Was it what she afraid of if he ever dated? Lonely? No! He wouldn't have a single mind to make his only sibling felt lonely. Then again, if he did date, it's true that he might have spent his times more with his girlfriend than with Hiro.

Hiro was the only one related to him by blood. The only one who had connection with his deceased parents. He had vowed to always put Hiro first before anything. Hiro also didn't have anyone beside him. It wasn't without reason for her to feel lonely if he didn't have time for her anymore.

Just the thought of it made him even sadder. He couldn't bear to see Hiro sad and lonely because of him. Tadashi tightened his embrace around Hiro's body. Trying to tell her that he wasn't going anywhere. That she was more important than anyone else.

"Hiro, it's not selfish. If you don't want me to have a girlfriend yet, it's fine. You just need to tell me. You come first. You're more important than any other girl in the whole world. I would even stay single forever if that makes you happy. I just want you to be happy."

He could feel Hiro shook her head, "No. I want you to be happy, too. Just.. just don't have a girlfriend anytime soon. Please? I still want to have you all for myself. Who else would be there for me if it's not my own big brother?"

Tadashi could feel a smile on his face. "Okay. I promise you, I would never date a girl until you allow me to."

"Thank, Dashi. I love you."

"I love you, too, dearest baby sister."

.

.

.

.

.

.

"Don't call me a baby!"

-oOo-

Unbeknownst to Tadashi, Hiro smirked in his arms after he promised her not to date anyone.

'Mission: ACCOMPLISHED.'

-oOo-

Meanwhile, in the cafeteria, Gogo, Honey, Fred, and Wasabi were watching a crying girl. Along with other students. No one except her friends was trying to comfort her. Yes, it was Linda who was crying. She was rejected even before she confessed to Tadashi.

"Wow, never thought Tadashi could make a girl crying like that," Wasabi stated.

"Yeah, me, too," Honey said, agreed to Wasabi.

Fred glanced at Gogo, "So, that's why you texted me to bring him here."

She popped her gum before she answered him, "Yup. Well, a bitch like her deserves it anyway." She turned around and walked toward the door. Before she went out of cafeteria, she took a quick glance to her friends, "By the way, wanna see the whole thing? I recorded it."

"Sure!" They shrugged and then followed her out of cafeteria. Not caring for the crying girl behind them.

.

.

.

.

.

"Oh, and tell us the things before the cafeteria scene, too!" Fred added. Gogo smirked at him, "Sure thing."

-oOo-

This information was known by a lot of students in SFIT.

Tadashi Hamada was a nice guy. Anyone had a chance to get close to him. But one thing for sure. He's an extremely protective big brother. You hurt his little sibling, then he would hate you for the rest of your life. Even if it's just a single tiny scratch!

-oOo-

Author's Note: I just realized that I haven't updated this story for almost a year! Well, ten months exactly. But, it's still almost a year, right? Oh, tomorrow BH6 the series will start airing for US region. Does anyone feel excited about it?

By the way, I actually have two options in my mind on how to end this story. One, changing Hiro back as a guy again. Or two, let her be a girl for the rest of her life. Which one you prefer to read?

Lastly, this is unedited. I almost lost half what I have written earlier because my laptop suddenly went blue and restarted itself. Really, I was on the verge of crying, thinking all the progress I have written tonight would be lost just after I almost finished writing it! Gladly, I only lost a little. Thanks to the auto-save setting.

Until next time~