Update ! So, I decided to go with the flow and make a new character so the two clans could become allies. The only problem is for me to write it without getting Shredder completely OOC. Oh yeah, almost forgot. The last chapter would be the only chapter for a while that contains Leorai. They will still interact but on friendly kind of way. That is unless someone asked for more Leorai. Also, from where this is going, I will only follow the series only the Season 1 part.

Ever since the fight with Snakeweed, everything has been going well for the Hamato clan. For the first time, they are finally a family and a as a whole. Leo no longer holds back (too much) on spars, Mikey are more cheerful than ever much to Raph's and Donnie's annoyance, Donnie are spending less time on his lab, and Raph while he still questions Leo's plans sometimes and it mostly just him submitting his opinion, he no longer questions his leadership.

But now isn't the time for him to think about it. After the recently canceled training, even though it's not Leo's fault, he was training twice as hard with his father, Tiger Claw. Leo have asked him how to manipulate his After-Images for his own use in particular. But now, he wished he didn't. Tiger Claw wanted to make his cub stronger but he also wants Leo to be independent. How do he teach a skill and trains him to be independent ? By keep attacking him using the same skill again and again until he figured it out by his own. Cruel ? Yes . Effective ? Absolutely.

All of Leo's knowedge about assassination wasn't actually taught to him, he figured it out himself. How long it takes depends on how difficult and complicated the skill is and Leo are absorbing everything like a dry sponge. His growth are definitely top notch but it's only because of his fire-forged willpower and the fact that those skills are created by Tiger Claw to be specifically used by tiger mutants.

A few days after rentless trainings, he's very close on figuring out how it works. He's missing something that cannot be aquired by normal means but that's all he knows about.

Leo was meditating below a tree inside the Foot clan dojo about it when Tiger Claw entered the room with a medium sized box on his hand. Leo's eyes opened slowly and saw Tiger Claw walking from the door to his direction. "What's in the box, Dad?" Leo ask while he raised an eyebrow.

Tiger Claw sat beside him with legs crossed. He opened the box, revealing some kind of black cloth inside. "This is what you are missing." He said and pull out the cloth. It was actually a light blue short sleeved T-shirt, just like what Tiger Claw are wearing. The color looked like it was fading but it seems new and from the looks of it, it was dyed that way. He handed it to Leo and the pulled out a black long cargo pants and handed it to Leo afterwards. "Oh, mind the Foot symbol."

Leo examined the T-shirt and found a Foot clan logo on the right upper arm part. "But Dad, I can't wear this if there's a Foot symbol on it. If my little brothers and sensei saw me sporting the logo of their arch-nemesis' clan, things will go real ugly, real fast."

"I don't say you need to use them all the time, only when you're on Shredder's missions." Tiger Claw reassured him. "So that your target knows you're representing the Foot clan." He continued.

"Yeah, but- oh wait..." Leo rested his head on his paw.

"Figured it out yet?"

Leo's posture straightened again and then he smiled. "Thanks Dad." He said and then Leo hugged Tiger Claw, which he returned. They broke the hug and Leo started inspecting the new clothes. He just remembered, every single of his target are once a member of the Foot Clan and they're not unfamiliar with the Hamato clan. If he wore a Foot clan attire, then in case someone wants a revenge, either its his target's followers or friends, they will seek the Foot clan, not his family on Hamato clan.

"Hey, cub."

Leo snapped off from his thoughts and turned again to Tiger Claw.

"Are you going to try it or not?"

Leo then hit himslef in the head. "Oh yeah, sorry." Leo stood up and streched. "Be right back." He left the room for a few minutes and came back wearing his new outfit. "I can't feel any diffrence actually. Are you sure this is what I need?"

Tiger Claw stood up and rested his hands on his back. "Try pushing the Foot symbol."

Leo didn't really know what for but he did it anyway. He could feel like there was a button hidden beneath the symbol and pushed it. After he pushed it, his T-shirt glowed dimly then get more and more dim until it was almost unnoticable. He still didn't feel anything. Leo waved is hand a few times but something happened. There are tracks of after-images followed his hand, even when he was doing it slowly.

"The shirt emit a special light that makes it easy for you to create after images. The reason is that the light has lower speed than normal light, which causes your refletion on your's and the others' eyes to be emitted much slower." Tiger Claw explained.

Leo might be smart but he wasn't Donnie smart. He just shrugged, knowing no matter how much Tiger Claw could explain, he won't understand it anyway. He walked slowly in circles while looking over his shoulders. He could see he was making some tracks behind him. He picked up speed and see that the tracks have longer distance than when he was walking. 'Time for some test'

Leo focused most of his strength on his leg and dashed forward, leaving a trail of his owm images. He jumped to the wall. When his feet touched the wall, he leaps to another one, then another, and he keeps doing it at full speed, filling the room with after-images.

"Good, but let's see how long can you use it" Tiger Claw challanged.

Just after about 10 seconds, Leo slowed down and fell to the mats, face first. His body are extremly tired and he was really dizzy from moving that fast in a small area. Then, he lost conciousness.

~0-0~

Leo slowly opened his eyes and find himself inside of his father's quarter. He tried to recall what happened that caused him to pass out. 'I was trying out my new gear, then I got too excited. I tried the move dad had been showing me and ...' That's all he could remember. He tried to sat up but he fell. His body are all sore, like he just trained non-stop for a whole day.

"Oh, you're finally awake." A voice which he recognized as Tiger Claw's reached his ear drum. "You shouldn't try to move just yet." Tiger Claw are sitting beside the bed Leo was laying down on.

"What happened?" Leo asked as he stared at the ceiling.

"You tried an advanced move, too advanced for your body to handle. You only used your legs but the stress of the stop-and-go motion ran not only on your legs, but also your thighs and core muscle." He explained. "You know, thats not the only move that you can use with those after-images."

"What do you mean?" Leo inquired.

"Their usage are to distract your enemies. For example, when your enemy is about to strike you, if you dashed backwards, you will leave after-images. Your enemy might think you're still within reach that they would unintentionally weaken and slows their attack, giving you better chance at aviding it." Tiger Claw informed his son.

Leo are in awe. "I never really thought about that."

Tiger Claw put his hand on Leo's forehead and petted him. "You still got a long way to go,Leonardo." Leo just nodded. "You should stay here for the night, you're not in any condition to go back."

"But,sensei and my brothers would be worried." He reasoned with Tiger Claw.

"That reminds me. Leonardo, you said something about your brothers earlier."

"My brothers? Yeah, they will worried if-"

"No, before that." He cut Leo off while waving his hand vertically in front of his face, gesturing that it wasn't what he meant. "Back at the dojo. Something about little brothers." He continued and rest his paw back on his knee. "By little brothers you mean the turtles?"

Leo are confused. Didn't he know about them already. "Of course. They are my brothers and will always be, no matter what." Leo's tone are have a mix of accusing. He thought that Tiger Claw think he didn't consider them as his brothers.

"No,no. What caught me is that you told me they are your little brothers." He said raising both his hands.

"Huh? What do you mean?"

"That night when I ... left you" He said trying not to hurt his son's feeling with the words "Left you". "... I saw the turtles and that time, I think they are about one, maybe two weeks old. But that night, you were a new born."

"Wait,wait,wait. Hold up, are you saying what I think you're saying?" Leo said, his voice are a bit shaky. Leo was gathering enough courage to learn about the ultimate truth that had been buried for more than 15 years.

"The turtles wasn't your little brothers, they are your big brothers."

Leo just stared at his father, wide eyed , and with his mouth gaping but not too big. 'No, I must've heard it wrong.' He thought. "Sorry, I think I didn't hear you right-"

"The turtles are your big brothers." He repeated himself. Tiger claw stressed the word "big" in this case.

Then Leo completely crashed. He felt like all the planets in the universe just crashed into his head. 'I'm the youngest all this time? Master Splinter didn't know about this? He was the one who found us, why didn't he know? To think I was even younger than Mikey ... Oh god ... if they found out about this, I won't live long enough to hear the end of it.' All his thoughts are mashed up together that he was sure if he was a robot, his head would be smoking by now.

He just covered both paws to his face. "Don't tell them about it, please?"

"Hmmm, maybe I won't" He teased.

"DAD!"

"Oh, look at the time. I have a meeting I have to attend to." Tiger Claw then ran straight for the door. " See you in the morning." He said then he shut the door.

LOL. Sorry but I just had to insert my headcannon in this chapter ( Leo was never stated officially to be the eldest (Never officially confirmed anyways) because he actually was the youngest of the four) . And this chapter also used some of the things I learned back at highschool ( Physics about the light speed and Biology and Physical Education about the muscles and strains).

Anyway...

How is it?Good?Bad?

Please Review to support this Fanfiction.