Author's Note: Here's a heads up for you all, my OC falls under the category of the Mary Sue since she is already a highly-skilled shinobi. Sorry about that. This story is not focused on her development as a shinobi, but her relationship with Gaara.
Walking slowly towards the direction of the faint sounds of cries, he couldn't help but move with caution. He was in the middle of the woods west of Konoha, but yet there's a baby nearby, crying. Is there danger lurking about? Is there really a baby in distress in the middle of the woods or is it a trap set by enemy shinobi waiting to ambush him? No. He couldn't sense any chakra from a potential enemy. So as he concluded that the baby was probably left alone to fend for itself, he ran towards the sound of muffled crying.
After running several yards, he stops abruptly. Right in front of him, on the ground, was a basket, covered with a white, thick blanket. Embroidered on it were small lily pads and lotus flowers. He could clearly see the movements of the baby beneath the fabric. He took a few steps until he was inches away from the basket. Getting down on one knee, he carefully inches his right hand towards the blanket and then slowly pulls it away, revealing a beautiful, wailing baby.
It was a girl. He estimated that she was about several weeks old, maybe a month or two. Wearing a plain, large, black t-shirt and diapers underneath it was clear she wasn't dirty or emaciated. He concluded she was well taken care of prior to being left here, and not too long ago. She could have been here for only a few hours, minutes even. She seized her crying and her big, raven eyes opened up and pondered at the boy before her.
"Who would leave such a cute little baby here?" He asked out loud, not really expecting an answer. The two continued to stare at each other in silence.
A few minutes pass by, suddenly; she extends her arms out towards him. "Aah!" she squeals.
He gives her a questioning looking for a few seconds, but then realizes that she just wants to be held. He gently scoops her up and cradles her. What do I do with you? He thought. After minutes of cradling and watching her slowly fall asleep, he makes a decision and with a single hand sign, he disappears in a puff of smoke.
"UGH. How long are we gonna sit here? When are we gonna go out and train?" yelled Naruto.
"Quit complaining and listen to Kakashi-sensei!" And with that, Sakura gives Naruto a little punch on his head, making him lose balance, causing him to fall off the top of the desk he was sitting on. "Oww.. Hmph.." he pouts and crosses his arms across his chest.
Sasuke didn't care to put his attention on the two, so he waited patiently for their sensei to continue.
"Now now. As your sensei and your superior, it is mandatory for me to explain to you the basic safety precautions you must take when going out on a mission." Kakashi is sitting Indian-style on the teacher's desk in front of the chalkboard, while his fellow students are sitting at the students' desks.
"C'mon sensei! We already know that by now, we're not little kids anymore!" Naruto pouts while sitting on the floor, crossing his arms.
"I know, I know. But-" Kakashi is interrupted by a knock. Their eyes turn towards the door. "Ah, come in." He says toward the person behind the door, already knowing who was on the other side.
The knob twists, the door opens halfway, and a kunoichi with long black hair tied into a poinytail steps in, still holding onto the door knob.
She glances at the three genin looking at her one-by-one until her eyes fall on Kakashi. "Kakashi, Sarutobi-sama wants you in his office. He has a mission for you."
"Oh really?" Kakashi jumps off the desk. "I'll be there in a bit, thank you for informing me Sayuri." He says with a smile, though it was hidden by his mask of course.
Sayuri nods. "I'll see you later then, nii-san." She closes the door and the sound of her light footsteps quickly fade away.
Kakashi turns his heads towards his students. "Well looks like this lesson is cut short today. I'll have to speak to you guys some other time. Have fun!" He waves at them and then makes his way towards the door and puts his hand on the doorknob.
"WA-WA-WAIT KAKASHI-SENSEI!" Naruto yells while quickly getting off the ground and onto his feet.
Kakashi stops and turns around. "Yes Naruto?"
"That girl!" Naruto points at the door. "She called you nii-san!"
"Oh. Sayuri?" he crosses his arms and leans his back against the door.
Naruto nods. Sakura and Sasuke were just as curious as the blonde boy.
"Hmm. Now that you mention it." Kakashi looks at the floor and closes his eyes for a few seconds, only to look back up at his three curious students. "I never told you that I have a sister, huh?"
"EH? No you didn't!" Sakura and Naruto wore a surprised look on their face.
"How could you leave that part out Kakashi-sensei!" Naruto walked a few feet towards Kakashi and put his hands on his hips.
"Well, you guys never really asked.." Kakashi shrugged, *sweat drop*.
"Tell us tell us! Who's team is she in? Who are her teammates?" Sakura joins Naruto.
Sasuke was quiet as usual, but he was eagerly waiting for their sensei's response.
"I'll answer all your questions another day, but right now the Hokage is waiting for me." He swiftly opens the door and was gone in the blink of an eye.
"Sensei!" Sakura yells. Then there was silence.
"MAN!" Naruto puts his hands behind his head, letting out a grunt. "Why does he always do that?"