My first InuYasha and One punch crossover! I am really proud of this one :)

This is a NON romantic fanfic; so no Yaoi here I'm afraid

The relationship between Saitama and InuYasha is solely fluff based and a father/son relationship given Inu-chan is still a kid when they meet.

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Darkpheonix666

Saitama wondered through the streets quietly; pain and anger embedded on his face. This last attack had been more serious than the last. The damage caused this time seemed to surpass the last if that were even possible.

His school had been forced to leave the building as soon as the alarm hit and they had been hidden in the shelter. The bonus was he got to miss out on boring lessons for today; he could concentrate more on training.

He was still in his training period and forced to hide inside the shelter to be protected from the attacks. The devastation was enormous and there would be a lot of clearing up to do that would last months.

However helping to clear the city would help him build his strength. He couldn't exactly do push ups and runs right now (unless it was at home) given how serious the mess around him was. But he would take what he would get.

Suddenly he heard crying coming from nearby. It sounded like a child; but why weren't they in the shelter? Could it possibly be that they had been forgotten or left behind? But how the hell could that possibly be?

Surely to god someone; anyone had heard them out here. Even if they were panicking surely the police would have helped them! To leave civilians alone optionally was just down right cruel and inhuman.

He hurried further ahead suddenly finding himself running to find the child. He hoped to god that they weren't injured in some way. The idea of a child being hurt by a monsters thoughtless actions made him sick to his stomach.

Saitama eventually came across the child; he looked only to be about 10 years old and still very small. He had long silver hair with small protruding ears at the top of his head. His hair reached his elbows and had glowing amber eyes that shone in the light.

He was wearing a small red Kimono, white under-robe and red hakama pants. Very feudal like and traditional; yet it somehow suited him. It went well with his hair but gave him a mysterious other worldly appearance.

"Mama….Mama….Mama!" the young boy sobbed tearfully. They fell down his cheeks like a waterfall spilling onto the ground. Why didn't anyone come? Why didn't anyone help them?!

Saitama approached the boy closer and was horrified with what he found. He could only imagine how traumatized and upset the poor boy was. A large building had fallen and crushed a young woman in a colourful Kimono. The impact had crushed her from the chest down and her body was pooled in blood.

Her long black hair covered the ground like a waterfall and was soaked in blood. Her face faced onto the cold hard floor thankfully hiding her expression from her young son. He could only imagine her pained or horrific expression from the impact of being crushed.

"When the monster attacked the city; she must have pushed him out of the way" Saitama thought to himself sadly. There really were no limits to what a mother would do to protect their child. This young woman had shown in today by saving her very young son.

Her right arm was reaching out towards the pup meaning she had desperately wanted to save him. Probably trying to touch him before she met her demise; how awful. However she had died a hero in her last moments by ensuring that her child survived the ordeal.

He slowly walked towards the small child quietly. There was nothing he could do; tragically this poor boy was now an orphan. He had lost someone very important to him and such an innocent age.

He knelt beside the young boy who looked up at him his face streaked with tears and his eyes desperate. Even knowing his mother was dead his eyes screamed desperation and hope. "Mama! Please help mama she won't stop bleeding!" the boy sobbed tearfully.

Saitama felt his heart being crushed and pain fill his entire being. The boy was far too young to understand that his mother was dead. No matter what he did right now; no matter how much the child begged. Nothing could bring his mother back from the hands of death.

"I can't wake your mama up" Saitama said gently kneeling beside the young boy his voice cracking. God how was he saying this to a child? Usually this was said when you were a teenager or an adult! Not when you were still innocent and naïve to the world around you!

The boys eyes filled with horror and disbelief "Why?! Why can't you?! She's hurting!" the boy begged helplessly. He was a grown up right? He was a good guy; otherwise he would have ignored them like everyone else.

Saitama felt his chest tighten and a sickening feeling coming over him. The fact that this child couldn't understand that he would never be with his mother again made it worse.

At such a young age children were unaware of death; of how all humans shared this fate. Sadly he had experienced it so young when you were still learning of life and all its wonders.

He had been subjected to one of life's uglier sides that such young children were not meant to see. So they were not scarred and forced to understand what terrible truths were hidden from them.

The boy clung to Saitama's sleeve helplessly "Why can't you help mama?!" he demanded tearfully. He had heard his mother talking about how there were people who didn't like him. Who saw him as an outcast who didn't belong because he was something called a half breed.

But why did his mother have to suffer like this because of him? Why did she have to suffer because of her child?! Why did she have to die like this? Because she wanted to keep him safe? Because she loved him?!

Saitama stiffened and took a deep breath tears stinging his eyes "Your mama is somewhere else now. She is with Kami and he will look after her now" he explained in pained voice.

She would be very much rewarded and cared for by Kami for her acts as a mother and preventing the harm of her son. Given how upset the child was she had obviously loved him very much. It was good to know she had loved him instead of hated him like the rare human did.

There were rare cases of human parents completely rejecting their baby when born a hybrid. Some would kill the baby at birth or try to miscarry just to prevent the baby being born. They couldn't handle that they would give birth to the child of a demon.

The boy stiffened and stared at Saitama in disbelief his body beginning to shake. Mama was dead?! That was a lie; it had to be. His mother wasn't gone; she would be ok wouldn't she? He could just make her some medicine and she would get better like she always did!

"NO! YOU'RE LYING!" InuYasha screamed angrily and started thumping his small fists against Saitama's arm in defiance. It couldn't be true; the one person who was kind to him was not gone!

Saitama held back a sob; of course he would act this way. What child wouldn't break down after losing someone so important to him? Slowly he reached out and placed a hand on the small boys head. He could only comfort him; that was all he could do now.

The boy jumped at him rushing into Saitama's chest. His strength nearly knocked Saitama over causing him to jolt in surprise. He was stronger than he looked for a child.

The boy began to sob in Saitama's arms; shaking and howling uncontrollably as tears soaked his shirt. He loudly cried for his mama while Saitama held him close trying to comfort him.

"How cruel; for someone so young to have to suffer like this" Saitama thought to himself bitterly. This boy was what was known as a Hybrid/half demon; a very rare case in the modern era but still something that was heard of.

Sometimes demons would seduce or fall in love with human partners. During this mating or courtship children were born known as half breeds. Both humans and demons were not kind to the offspring seeing them as beasts or outcasts; unable to belong in either world due to this.

Humans hated them because of their demon blood. They were seen as evil and demonic and incapable of any form of positive emotion or feelings. They were hated by them and tormented badly.

They always assumed the human parents regardless of whether they were male or female was raped. Their mating ritual must have been forced in order for the child to be born into the world.

But when that human genuinely loved that demon as did the latter; the humans saw them as traitors and isolated them from their own kind.

Saitama found this to be disgusting and pathetic. This child had no control of where he came from and did not necessarily have to be evil. For them to punish him simply for his breed was cruel and selfish.

As for the demon blood the latter would have nothing to do with that child. They hated them for being born traitors to their demon blood. They saw that baby as impure and filthy; a disgrace to their demon blood for being tainted by human blood.

Many demons would bully the child or kill them for fun; often trying to attack when the offspring was small like this one. When their powers had not awakened yet so they put up less of a fight

Neither side was better than the other. No matter what actions they took they made the child suffer needlessly for being of different blood from other side. They simply couldn't accept the child as part of their own race.

He would never be accepted by humans or demons. He wasn't one or the other, not a demon and not a human. So he would never be accepted by either breed for what he was.

"Say what's your name?" Saitama asked gently slowly patting the boys head. He knew how bad this looked but his intentions by no means were impure. He just knew that he had to protect him.

The boy stopped crying and looked up at Saitama sniffing tearfully. He wiped his eyes with his sleeves gently. "I…InuYasha" he replied hiccuping slightly. The name meaning meant "Dog" and "Half" literally meaning half dog.

Saitama blinked and almost smiled; that name seemed rather fitting given his ears. He wondered what he would look like as a human. He had heard in stories that every so often because of their human blood; hybrids would lose their powers once a month.

This meant they were defenseless and unable to protect themselves from danger. This put them at great risk to demon enemies and were capable of being killed during this time. So they had to hide giving themselves protection from whoever they were after.

He smiled warmly and hummed "Say InuYasha would you like to come live with Onii-chan?" he asked gently. He was glad he was alone; or that would sound very suspicious to most others.

He knew of what problems lay ahead with looking after a half demon. But he couldn't leave this poor child alone; regardless of his blood inheritance. It just went against his moral code as a human.

The small boy blinked in confusion and awe; this human was asking him to live with him? But wasn't he scared of him? He thought all humans were mean and scary people.

Saitama saw his expression and tilted his head curiously "What? Don't you want to live in a nice warm house?" he asked curiously. He couldn't abandon someone so young after what he had just lost. He couldn't possibly endure this pain alone.

InuYasha snapped out of his shock and shook his head quickly. He wasn't used to someone being kind to him other than his mother. "I…It's just…." InuYasha stammered nervously his head glued to the floor. His body was shaking again but out of shock.

Saitama hummed thoughtfully. He had no intention of doing this boy any harm at all. Sure it would be weird becoming a big brother/parent to someone at 17 but hey-ho.

"Aren't you scared of me? Don't you hate me for what I am?!" InuYasha blurted out quickly his voice filled with confusion. Most people would mock him and bully him; sometimes they even threw things at him which hurt.

The two shared a long stare between the two of them; hope, fear and confusion filling the young boy's eyes as he looked at the older boy. An unspoken bond of trust was shared between the two.

Saitama smiled gently and placed his hand on InuYasha's head gently "I'm not one to hate someone for something as stupid as race. You can't help where you came from right?" he said kindly.

InuYasha's eyes widened with shock and yet were filled with wonder. This person; this mysterious Onii-chan was accepting him despite being a half breed. He thought nobody but mama would care about him and look past such a thing.

He already knew his older brother Sesshoumaru hated him. The latter knew of his birth and that he was alive; but he cared little for his well being or safety; hell he wouldn't care if he lived or died.

Saitama chuckled at his amazed face; kids were really the cutest when they were like this. It was almost amazing how they admired other people the way they did. At least he still retained some shred of innocence.

"So I'll ask again Inu-chan. Do you want to live with Saitama Onii-chan in a nice warm house away from all those who hate you?" he asked gently. While the rest of the world would happily abandon him and let him suffer. He would not let this orphaned child live alone like this after what had happened.

InuYasha blinked and looked at his mother again. He didn't want to leave her but there was nothing he could do. Hopefully she wouldn't be angry at him from where she was with Kami.

"Do…Do you think Mama will mind?" InuYasha asked curiously his voice filled with hesitation. She had always warned him to stay away from strangers who would do him harm. But he felt like he could trust this older person. He had a sense of kindness and warmth about him that gave InuYasha hope.

Saitama blinked and realized he meant his mother. He would not let the poor woman's sacrifice for her son go in vain. He would give him a happy life and raise this child the best he could. Given how he was a student himself it would not be easy to do.

"No; I'm sure she would want you to be safe and happy" he explained warmly. He would care for InuYasha just like his mother would have if not for her death. He didn't know how good a big brother he would be; but he would do his best.

InuYasha gazed at him then smiled softly "Ok; I…I'll come live with you Onii-chan" he said hesitantly. If it meant he didn't have to be alone he would happily go with this older brother.

Saitama breathed a sigh of relief and straightened up. At least he knew that this boy who was now in his care would be safe. He then started walking ahead back towards his house. He at least wouldn't have to eat dinner alone and would have someone to share it with.

InuYasha followed after him quickly his long silver hair blowing in the wind. He caught up to Saitama in no time at all. He had found that he was faster and stronger than most kids his age; his mother told him as he got older he would have all sorts of powers.

"Say Onii-chan what's your name?" InuYasha asked curiously looking up at his saviour. If he was going to live with him from now on; he would have to know his name.

Saitama looked down at him and smiled a little "Saitama; and I plan on becoming the strongest hero" he said proudly as he walked into the distance.