Chapter 36 Roar of a Dragon

I don't own Ben 10.

At a forest was a young man with long brown hair and green eyes, he has a black vest that shows off the muscular build he has, he has green pants and black boots that are made for combat.

He was looking at city called Kuoh and said:"Looks like I'll have to have some fun."He punches his palm."While taking out the trash."

This is Ben Tennyson, after he was ignored by his family, he was found by a dragon called Raptor, a Black fire Dragon and thought him the magic of a dragon slayer of his element, he was sent to this world at Raptor's request to check something out.

Scene Skip

Ben was at a park and he was with a girl called Asia, she and him became friends as they went around the city together, Asia was afraid of Ben at first but he showed he was a nice guy and she was happy.

He was now facing off against four fallen angels Raynare, Dohnaseek, Kalawarna and Mittelt along with a army of exorcists.

"You should stayed away human!"Raynare said and they threw light spears at him.

Ben punches his fists together and said:"Roar of the Black Fire Dragon!"He shoots a black fire blast at them destroying the spears.

"What?!"She got shocked before she and her three friends got blasted away.

The Exorcists charged at Ben who charges at them."Black Fire Dragon's Iron Fist!"he punches a group away with his fist covered in fire.

Asia was amazed seeing Ben fight them all off."Ben."

"Don't worry Asia, I'll beat these guys up and you'll be safe!"Ben said.

Raynare got up and then sees her three allies charge Ben.

"Black Fire Dragon's Wing Attack!"Ben swings his arms sending a stream of fire sending them down knocking the trio out.

Raynare steps back and looks at Ben in fear."What are you?"

Ben has the Black Fire come out of his body making him scarier."I am Dragon Slayer mage."

"No! That's a lie! Theres no such thing!"Raynare said.

"It's real, now take this!"He charges at her and he was covered in fire."Black Fire Dragon's Sword Horn!"He hits Raynare making her scream before she goes through a fountain and destroys it.

She was knocked out as Ben stands proudly as the enemy was all defeated.

"Ben did it."Asia was stunned.

Watching them was Rias Gremory and she was shocked, she just saw a human with a high level of magic defeat four fallen angels and a army of stray Exorcists.

"That's amazing."She said.

Scene Skip

Ben met Rias and her group and they were amazed at his skills, even Issei thought he was super cool.

But then this guy Riser came and he was forcing Rias to marry him, so Ben is helping them out as a extra piece while still being human.

He was a copy of the school facing off against Riser and he was smirking at Ben.

"So that arrogant human came to face the great Riser."He charges up a fire and shoots."Take this!"

It explodes on Ben making him grin."Man."Riser got shocked."Your fire..."Ben was eating it."Tastes so bad!"

"What?!"He was shocked and all the devils seeing it were shocked too.

Ben smirks at him after he finished."Sorry, but a fire user can't beat me."

"No!"Riser tries it again but Ben charges foward eating it again.

He punches Riser in the face making him grunt, then he starts to punch at Riser many times in the face breaking some of his teeth.

He punches him down and said:"You might be a pheonix, but I was trained by a dragon."

"You arrogant little human!"Riser attacks but Ben wasn't affected his attacks making him scared.

He backs away and said:"Don't you know how important this wedding is to our kind."

"Oh can it, your just someone that wants to force a friend of mine to a life she doesn't want."Ben then charges up and puts his hands up making the fire go there."Black Fire Dragon's Brilliant Flame!"He sends a orb at Riser making him scream.

"Yeah Ben!"Issei cheers with the others doing the same.

Rias smiles at Ben since he protected them all.

Part 2

Ben was now facing off against Kokabiel at Kuoh since his group stole Excalibur swords to merge them together, two Exorcists called Xenovia and Irina came and Xenovia tried to kill Asia but Ben beat her up and her friend shocking them.

They fought against the crazy priest with Excalibur but Ben broke the sword into pieces shocking Valper that one that fused them together.

His friends got pretty hurt fighting against Kokabiel and it really pissed him off.

Ben punches Kokabiel down and he grunts."Why are you still fighting after hearing that God died?!"

"Do you think I care!"Ben said surprising him."I only came because you hurt my friends! So I'm going to kick your ass!"

"Why you arrogant human!"He said.

Ben then got covered in red lighting surprising him."Red Lighting Fire Dragon Mode!"

"Ben is combining two elements!"Rias said.

"It seems he gotten stronger."Koneko said.

"Ben."Issei said.

"Impressive, not many dragons can do that."Ddraig was impressed by Ben.

Kokabiel shoots a light spear at Ben who charges foward breaking it with his punch.

"What?!"Kokabiel was shocked before he got punched in the face.

Ben punches at Kokabiel many times before kicking him to the sky

Kokabiel was sent up and he charges up a bigger spear."I will not be defeated by a human!"

Ben charges up and looks at Kokabie."Red Lightning Black Fire Dragon's Roar!"He shoots his combined blast at him.

Kokabiel throws his spear but it got consumed by the attack.

Kokabiel got scared before he got hit making him scream, then he exploded and everyone was amazed at the level of power.

They saw Kokabiel crash to the ground defeated and he was burnt up.

Xenovia looks at Ben with a amazed look as he looks like a dragon in her vision.

The barrier got destroyed and they saw someone wearing a white version of Issei's armor.

"Not bad dragon slayer."He chuckles."It makes me excited seeing you fight, so I hope we can fight one day."

Ben smirks."Bring it on!"

Scene Skip

Ben was now facing off against Cao Cao at a forest with Lilith behind Ben.

"So you came to face me, what is it because she's your daughter?"Cao Cao said with his spear ready.

Cao Cao made Lilith with Ophis energy but he also added Ben's to make Lilith making her his daughter.

"No one harms someone that's family to me, I will make you pay for using her!"Ben fires up.

Lilith was surprised and has tears in her eyes."Papa!"

Ben charges up and he was having black and red marking on his body."Dragon Force!"

Cao Cao got surprised at the power he was feeling."What is this?! I never felt this power from a human before!"

Ben punches Cao Cao in the face making him grunt before he starts to punch at Cao Cao many times before kicking him up.

Ben appears above Cao Cao and slams him down.

Rizevim was nearby and he got shocked seeing Cao Cao crash on his side."Cao Cao!"

He hears a roar and he looks up to see Ben coming down with fire and lighting on both hands."Take this!"He makes two giant orbs of the two elements before slamming them against the duo.

They scream in pain since it was too much before it exploded knocking them out.

Ben then jumps back and glares at the two.

"Papa!"He looks back and sees Lilith running towards him before she hugged him."Papa!"

He smiles at her and pats her head.

"So."He looks up and sees Ophis smiling at him."I am impressed Ben, looks like you protected our child with such power, it just makes me want to have you even more."

"Oh yeah."Ben said.

Ophis was interested in Ben's power since it's magic she never seen before based on Dragons, she wants him for her.

Ben will protect his child from anyone that dares harm her and the ones he loves.

Note:Here Dragon Slayer Ben, it's a version where Ben was trained by a dragon and went to the DXD world, for now the girls that like him are Asia, Xenovia and Ophis.