Description: Peter Stark, the prince of the Shaytan kingdom comes to a demonic conclusion.

A/N: Okay this is an AU relating to an anime. If anyone knows what it is props to you because they will be a part of this. Possible spoilers be aware. ⚠️

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Peter watches in the distance as black flames spew from the battlefield in front of him. A look of horror crosses over his face knowing exactly what those flames meant.

The demon race.

The young prince was on a search for his childhood friend who had been travelling the country with a band of holy knights but had only found himself looking upon a wasteland.

One demon seemed to take notice of him because the next thing he knew, there were black flames flying towards him.

Peter removed his sword from his sheath before focusing all his energy into his sword.

"FULL COUNTER!" Peter yelled before swiping his sword through the air. The black flames went flying the other way hitting the demon that had spewed them at him.

The sword was put away after and Peter flew closer to the centre of the fight. But once reaching it, he was greeted by a horrific sight.

A blonde haired kid was laying on the ground, seven swords in his body, and his eyes had gone dull. A girl with white hair was holding onto him, while ten demons looked upon them with a look of pity and craze.

A short black haired demon notices his presence quickly but does not react to him much. Another brunette demon, a female this time, suddenly appears next to him, kicking him out of the air.

A cry of pain escapes Peter's mouth as he aggressively hits the ground. The ground digging into his skin and cutting him all over.

Without a moments hesitation, Peter gets back onto his feet and pulls his sword out once more. With sudden speed that surprises the demon, Peter throws himself forwards only for a hand to grab him by his neck.

A chocked cry left Peter as he hit the ground. The white haired demon that had grabbed him stares down at him with a smirk on his face.

"Oh ho what do we have here?" The white haired one asks leaning closer to Peter.

"BACK OFF!" Peter yells swiping his sword managing the catch the demons cheek before getting up in a defensive position.

"It's just a kid" the giant red metallic demon cackles leaning backwards seemingly finding the situation funny.

"He's no threat. Let's just kill him now and be on with our days" a purple haired demon sighs, a purple flamed tendril coming out of pin Peter to the ground.

"Hold on" the short black haired one exclaims before moving closer to Peter.

"He seems quite familiar doesn't he?" The white haired one asks quirking an eyebrow.

"His power levels are off the charts. But he's nothing but a child. Look kid you have no idea who we are do you?" The black haired demon questions. At Peter shaking his head no the other sighs.

"We're the Ten Commandments of the demon realm. We're here to get our revenge on the world for locking us away" The white haired one announces throwing his hands in the air.

"I'm Zeldris. The white haired one next to me is Estarossa. The purple head is Melascula. The giant red metal one is Galand. The two slightly normal looking ones are Monspeet and Derieri. The giant black thing with demon head is Grayroad. The actual giant is Drole. The fairy next to him is Gloxinia" the black haired one, now known as Zeldris, says.

"I don't care. Just let me go" Peter hisses trying to get away from the tendril holding him down.

"Can we just kill him now?" Grayroad asks moving around oddly freaking Peter out.

No other words were spoken before a sword appears in Estarossa's hand.

"Any last words kid?" Estarossa questions tilting his head to look innocent.

"Yeah just one. Get away from my kid"

A black tendril appear above Peter, knocking everyone demon standing before him out of the way. The one holding Peter down is gone in an instant so Peter is finally able to see who saved him. With a loud gasp, Peter quickly bolts towards his father who has his trusted team of warriors called the Avengers behind him.

Tony welcomes Peter into his arms holding his son close looking over him for any injuries.

A loud laugh emerges from the cloud of dust before Zeldris and Estarossa step forwards.

"I should've known you didn't die. The kid seemed to familiar to go unnoticed. Isn't that right Anthony?" Zeldris taunts a wide smirk across his face.

"I never thought I'd ever have to see any of your faces since you were locked away by the angels" Tony grumbles glaring at them.

"Wait dad you know them?" Peter asks looking up trying to make eyes contact with Tony.

"DAD?! Did you hear that Zeldris, good 'ol Anthony went along and brought a kid into our demented world" Estarossa exclaims laughs escaping him.

"I suggest you both step back and go back to where you came from" Steve, Tony's right hand man, growls preparing to charge at them.

"Your band of misfits is looking as terrible as always. So Anthony, does that son of yours know what you are, what he is?" Derieri asks stepping forwards. Steve gets more angry at the sight of her.

"What are they talking about dad?" Peter wonders removing himself from Tony's arms and taking a good step back.

"I'm the eldest son of the demon king" Tony sighs not even making eye contact with the kid who looks betrayed.

"Oh kid why don't you come over here and give dear 'ol Uncle Estarossa a hug" the demon jokes laughing at Peter's horrified face.

"Why did you never tell me?" Peter whispers moving further away from his dad who has finally turned to look at him.

"Because I'm not proud of it. I was the only one not to be trapped in the demon realm because I managed to overpower the archangels power. I was trying to move away from my heritage so you'd have a good world to grow up in. It took me 3000 years kid. I've been roaming this world for a long time. Now look where we are. Why would I give up being a king of my own kingdom that one day I'll be able to pass onto you?" Tony explains looking beyond irritated towards the people that made him tell his son the one thing he never wanted him to know.

Peter allows a tear to fall from his eye which his quickly wipes away to try and hide all his feelings he was going through. In the moment of panic, Peter flies away ignoring the sound of his dad calling out to him.

Tony watches his son fly away knowing he needs time. Instead, he focuses his glare back on the demons in front of him. A sigh escapes him before allowing the demonic powers to engulf him.

"Tony? What are you doing?" Bucky, Tony's other right hand man, asks trying to stop the man from going overboard.

"I've never once had a problem with any of you. Even though we've never affiliated I'm sure you know that I can flatten you easily. So listen to me carefully. You stay far away from my son. If I even find out anything about him being hurt because of one of you, you won't live to see the next day" Tony threatens his full power being released making the Ten Commandments take a step back.

"And that's exactly why you're the demon kings heir" Zeldris smirks a wicked laugh escaping him.

Peter stops midair to take a look back onto to find a large tunnel of pure demon power going right into the air. More tears that Peter had been trying to ignore fall from his eyes. Confusion fills him not knowing how to react to everything that just happened to himself.

The prince goes to turn around when he's hit with something large and green. A small scream escapes him as the giant thing goes so fast he's being pushed against it.

"HEY THERE'S A BOY!" someone yells and Peter looks up to see a man with glasses staring down at him.

The wind slows down and Peter is able to push himself away from the green thing. He goes back far enough to discover that it's a giant pig with a building on its back. On the pigs back are people who are all very beaten up.

"You alright kid?" A small child asks as Peter gets closer to inspect what's going on.

All Peter does is nod in response.

"What's your name?" The same kid asks surprising Peter by suddenly flying upwards on a pillow.

"P-Peter" the prince stutters his adrenaline going down making him feel faint.

"Well him King, the pigtailed girl is Diane. Mr. dark a brooding is Ban. The pig is Hawk. The guy with glasses is Escanor. The girl with black hair is Merlin. The pink skinny dude is Gowther. Oh! The giant pig is Hawk's mom. We're the Seven Deadly Sins" King introduces the beaten up group with a pained smile.

"I've heard of you. Just never seen your faces. The Shaytan kingdom doesn't really affiliate with Liones" Peter says putting on a brave face.

"Power level fourty-five thousand" Gowther announces making everyone turn to look at him.

"FOURTY FIVE THOUSAND! HOW IS THIS KID SO POWERFUL?!" Ban exclaims waving his hands at Peter who let a frown cross his face as he looked down.

"My dad is the eldest son of the demon king" Peter shares before looking up not being surprised by the amount of weapons aimed at him.

"What should we do with him?" Diane asks preparing to attack.

"I'll leave right now if you want me to. If it eases you a bit I only found this out a few minutes ago" Peter mumbles scratching the back of his head in a nervous manner.

"Let's cut the kid some slack guys. Clearly this kid is going through some emotional stuff right now. The shaking and the bloodshot eyes can be some indication. Come with me Peter we'll get you some food" Escanor says wrapping an arm around Peter's shoulder and leading him inside.

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Part 2?