Donatello had always wanted a baby brother as far as he could remember. However when he finds a dying boy only a year younger then him, he does everything he can to help him. (AU human.)

Hi ya, so this is my first human fic after reading a couple, a new idea wouldn't leave me alone. In this story Karai will be in it, however she would be called Miwa. Enjoy.

Donatello moves his short brown hair away from his eyes as he runs through the streets of New York city. He groans as he steps in a dirty muddy puddly and the water splashes over his purple jacketed, he ruffs a hand through his hair. He doesn't have time for this, he wasn't meant to stay as long as he did in the school silence lab – working on a project, but he did.

His legs started to run again, pushing through the people around him his hand going for his pocket and quickly glancing at his phone. He sighs, he wasn't meant to worry his family, but it looks like he did.

Twenty miss calls, four from Miwa along with three text messages, six from his Raph two text messages, seven from Leo and eight text message and then there was his father three miss calls and four text messages.

He was so dead, he was 15 and his family was still worrying about him, then again his older brother Raphael was only 17. Even Leo was 18 and unless his older brother called or left a note, his family often walked around and search only to find him working on endless night.

Miwa was often free to do what she wanted, since she had her own apartment and was 20 years old, but was still expected to check in on the family every now and again.

It was why, Donatello couldn't help and not look forward to his 20th birthday, and sure he loved his family. However, due to his smarts he had skipped a couple of years in school and was even in the same year as his older brother Raphael – despite his hot head brother always protesting on the matter.

If this stays the way he keeps going now, he should have been in university by next year. However his father had wanted him to have a normal life – in fear he may be teased or picked on by other kids.

Due to the fact that most of them had to work a lot harder then he, but he still can't help and feel frustration about it.

"Hey watch it!" he shouts, as he runs into a blond haired kid who was only a year younger them him.

"Sorry," the kid in the orange jumper mumbles before walking off.

"Where the shell, have you been?" Donnie jumps at the sudden loud voice.

He smiles weakly as Raph parks his motorbike on the side lines, Raph removes his red school bag and takes out another helmet placing it ruffle on his brother head.

"Well any answer smart brain?"

"It's not my fault, I wasn't paying attention to the time, I swear."

"Right, good luck at trying to tell Leo that. He's been that messed up, he even called Miwa over and the whole house hold is running amuck."

"I was only a little bit later," Donnie protest.

"It's five o'clock, how is that a little bit late," Donnie let's a nervous giggle.

"Whatever good luck at telling Leo."

Donnie adjusts his helmet before he hoped onto the bike, his eyes turned towards the boy he had recently run into. His mind can't help and wonder why the blond was sitting there alone in an alley way.

"He's home," Miwa yells as she watches through the window.

"Is Donnie with him," Leo runs in, nearly tripping over in the process.

"Yep," she replied as she watches Donnie handing over his helmet over.

"Where's father?" the girl asked as she walked over to her younger brother.

"He was called into the Dojo, somebody tried to break in."

"Why, would someone want to break into a Dojo?"

"Don't know, but nothing was stolen only left overs in the fridge." Miwa raised an eye brow at the sudden piece of information, both eyes turned towards the open door.

"And where have you been?" Leo asked, crossing his arms.

"Sorry Leo, I was trying to get a new project down and I forgot about the time."

Miwa giggles before mucking up her little brother hair and walking out the door.

"Next time tell us," she said.

"I lost track of the time," Donnie protest.

"Then set an alarm clock, it's not that hard to work out." he points his tone out and his older sister only rolls her eyes and closes the door behind her.

"She's right you know," Leo said. "You're the smartest one in this family, you should have known better."

Donatello can't help the guilt that overwhelms him, they were all right after all and he knows that they've been worried about him as well and the thought doesn't help ease his worry.

"I remember next time."

"Good. Now get dress soon were going on patrol."

"Ya kidding right," Raph but's in.

"No, I'm not. It's Friday night, why. Have anything better to do?"

"As for a matter of fact fearless, I was going to go to a party with Casey and Slash."

Leonardo rolls his eyes, he didn't know who Slash was, but Raph had mentions that he met the guy a couple of nights ago and for some strange reason. Something was eating at him telling him not to trust this guy, call it judgment. But the last thing Leo wanted was to see his normal anger, hot headed little brother in the hospital because of the new guy.

"No Raph, patrol tonight. Don, call sensei tell him that you're home and nothing to worry about."

Donatello nods and walks off.

"Whatever," Raph mumbles, "I'll go tell the guys, that I aren't coming, because of a mother hen."

"Hey, I am not a mother hen," Leo complains and Raph rolls his eyes before walking off.

The three run quietly through the night streets, as they jump over and carefully landing onto the roof tops. All three -looking for any signs of trouble- there clothing is different compared to what they normally where. Black clothing to help them blend into the night sky and only there coloured mask was used to help tell them apart.

Their father had helped them train and they often helped other kids in the dojo as well. They had taken it upon them self to help the city, despite their father protest. Miwa used to be a part of their team, however ever since the death of their mother. There older sister had spent most of her time, just living norming and often only come when the boys needed help.

"Boarding," Raph said, as he leaned over the edge and looking down at the city below him. "Remind me again, why I'm missing out on one cool party and force to come up here. With people who have no social life."

Leo stands with an un-assumed face, while Donnie's eyes hadn't moved from his phone.

"We do have a social life."

"Right, you've got no friends and Donnie only has April. Who he wishes for her to be his girlfriend," Raph said dreamily, taking away his brother phone.

"Raph, give it back."

"Who ya texting, you're girlfriend."

"She's not my girlfriend. She's just a friend, who is a girl."

Donnie grabs his phone away from his older brother grip, despite his hot head brother hand in his face trying to prevent him.

"What are you doing them, Donnie?" Leo asked.

"I'm creating a tracker app."

"Creepy," Raph mumbles.

"Why Donnie?" Leo asked, doing his best to at least try to act like's he's interested

"To help father, track down the person who broke into the dojo."

"The guy stole, left over food. I don't think father really cares," Raph said.

"Yes, but he broke a window Raph. The guy needs to pay for the damage he caused."

"The kid probably doesn't have the money in the first place, if he did it. Come on Don, just give it a break."

"You guys are never interested in what I do," Donnie mumbles.

Donatello was normally the clam one out of his sibling, friends and teaches often knew about it and the only time he had ever snaps is out of anger on his brothers.

Most of his family didn't necessary stay around and here what he had to say, sure his father would and when his mother was alive she would always be there for him.

However due to his sensei work, he had often wasn't around and leaving him stuck with Leo and Raph. Between the two fighting and Miwa not around as often as she used to be – it was just him.

"That's not true Donnie," Leo injects.

"Yeah. Then whenever had you just wanted to hang out with me and just be brothers."

"Well…" Leo stops himself. It was true they're often only seen each other during training and meals.

"See, you can't even think off one. I wish I had a little brother, unlike him he wouldn't leave his brothers alone. The only reason, why all of you were even in the house the same time was because I didn't call." Donnie said, sitting on the ground, hugging his knees.

"Ah Don, you know we care," Raph said, sitting beside his brother.

"You have a funny way of showing it."

"Donnie, it's not that we don't care. It's because were busy, were always out and an about but that doesn't mean we don't love each other like family." Leo said, as he joins them.

"Yeah I know," he mutters.

"You don't really wish for another brother, do you?" Raph asked.

"Why not? It's not fair that I'm the youngest, I want a little brother to look after to."

"Yeah, but think of fearless over there," Raph said as he points over to Leo, who glances up to him.

"Why?"

"Well, he's got three little brothers to look after and Leo's going to be grey by the time he's 24."

"I will not," Donnie giggles at Leo comment. "I won't be and beside what about Miwa. She will have four little brothers to look after."

"True, I never thought of it liked that," Donnie admits. "Raph!"

Leo smiles as Raph takes Donnie and messes around with his brother hair.

"Did you get it," a chocked voice asked.

The boy with the blond hair rubs his arm and shakes his head, his baby blues looking up with fear.

"No," he said quietly.

He flinches as the older boy bangs his hand onto the brick wall. The teenage in front of him, had dark black hair and wearied dark blue draggy clothes.

"I ask you to get it!"

"I was hungry." the boy wines.

"So you break into a dojo and not into the bank. Look kid, I want the cash."

"Why should I even listen to you? I don't even know you're name."

The blond hair boy crash towards the ground as he feels a punch to the face, he wipes away his tears as a hand goes over the sore.

"Because I can get you everything you wanted and besides. What's a street rat like you going to do, with someone like me? You don't even have a name kid, that's how much you're family wanted ya! Now next time, get me the cash."

"I well," the boy said.

"And I guess you can have the one piece of information, you can call me Slash."

Dun, dun, dun!

Okay so first off, sorry for any Slash fans out there. I don't mind the guy, but I didn't want to add a OC for the story and the Shredder may come into it later. So I figure, to add Slash into it and now questioned time.

What do all my lovely readers think about my human AU? Hoped you liked it and I look forward into reading you're reviews, you guys are awesome and don't let anyone tell you otherwise. Cheers!