Author Notes:Hey you guys welcomed back for another Chapter of Ben 10 High School DxD here's Chapter 4 I hoped that you guys will like and enjoyed it.

Last time Ben learned about Supernatural beings from his cousin Gwen Tennyson like Devils, Angels and Fallen Angels. He also told Issei, Rias, Asia, Kiba, Akeno, and Konkeo about the Omnitrix and his life has a superhero, Issei, Kiba, Akeno and Konkeo didn't believe him at first until Rias told them what Ben has done was true from her brother Sirzechs.

After Ben has defeated another group of Fallen Angels and learned the ones who sent them was a Fallen Angel General named Kokabiel.

What will come for our favorite alien hero and new friends? Let's find out now!

Disclaimer:I don't own Ben 10 or High School DxD they belonged to owners.

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Enjoyed!

Chapter 4:Ran of A Stray Devil

Kouh Academy Class 2-4

Ben and the rest of Class-4 were in History Class learning history from different countries like before they were paying attention to the teacher, as he was writing the lesson on the chalkboard and faced the class.

''Alright, class who discovered America in 1492?'' asked the teacher.

Ben raised his hand.

''Mr. Tennyson?''

''Christopher Columbus.'' answered Ben.

''Correct.'' said the teacher.

''Benny knows his history.''' commented Katase.

''He's so dreaming just Kiba, Rias and Akeno.'' smiled Murayama.

''And the cutest and smartest boy.'' added another girl.

The male students glowed at Ben again stealing the girls from them.

''Man, the new guy is really on my nerves!'' yelled Matsuda one of Issei's friends.

''He really is pissing me off!'' glowed Motohama Issei's second friend.

Issei and Asia didn't say anything.

''Alright, class settled it down.'' responded the class. The whole class went quiet. ''That's better now it's move on the next lesson.''

Everyone turned the page on their text books.

Ben has gone better in all of his classes and he has been sturdy and really hard to pass the semester to make his parents and grandpa proud of him. While doing it he faced Fallen Angels or other Supernatural threats after him. After he found out that a Fallen Angel General wanted him dead.

Until he finds out why no Japan knows he is and why a Fallen Angel General luckily he got found for that Issei, Rias, Kiba, Asia, Akeno and Konkeo.

Speaking of that he remembered his talk with Gwen after he came home after he got answers from the Fallen Angels last night.

Flashback...

Ben was in his bedroom talking to Gwen on the phone.

''So, they their Master is Kokabiel?'' asked Gwen.

''Yeah, and all they said was he wanted me dead so that I won't ruined his plan.'' answered Ben.

''You also that they attacked you bright daylight.'' replied Gwen.

''Yeah, they'd.'' said Ben. ''Last night they attacked at night.

''How many people were around you?'' inquired Gwen starting to get worry.

''No one, in fact no one was around, felt weird.'' answered Ben.

''I think I've have a theory on that.'' responded Gwen.

''What it is?'' questioned Ben.

''The Fallen Angels and the first group attacked you trapped you inside in a Dimensional Rift a pocket dimension where the laws of time and space are almost none existent, the ones who create the rift control of all of its properties and keep anyone in there as long as they want, if they have enough magical energy.'' explained Gwen. ''The Fallen Angels usually trapped their targets in the Dimensional Rift so can't be seen by outsiders. What happens in the rift stays, it may feel like you are in there for hours but its only been a few seconds, maybe even minutes on the outsides.''

''That's kinda awesome but also sucks since those Fallen Angels can just attack me whenever they want by trapping me in a rift.'' stated Ben with an annoyed sigh. ''Where I go I've always been a hero where no one knows who I am, but there are three Supernatural beings at war, and there a Fallen Angel General wanted me dead. But luckily I have helped.'' he smiled.

''Oh that's right, it looks like you have a lot of work to do over there.'' pointed out Gwen. ''Whatever Kokabiel is planning it's looks liked he wanted you and Rias' Peerage out of the way.''

''I know but I think I have a theory that he wanted me dead.'' elaborated Ben.

''What it is?'' asked Gwen.

''Well remembered I told Rias's brother and the Under World has heard of me?'' earning a yes from his cousin. ''I think this Kokabiel may have heard of me so whatever he's up to something he wanted me of the way because I've saved the world and the universe.''

''That's what Fallen Angels do they do whatever it takes to eliminate their targets and their Masters told them.'' Imputed Gwen.

''Well I don't think this Kokabei guy wouldn't send anymore of his Fallen Angel troops to kill me after the last group failed.'' concluded Ben.

''Yeah, after you get them the beating they deserve and show them not to mess with up.'' agreed Gwen. ''Well anyway I've got back to studying, let me know what Kokabiel wanted you dead.''

''Okay, I'll let you know and you'll be the first person I called.'' replied Ben.

Ben hangs up his phone and is placed next to his alarm clock.

''Alright you Fallen Angels and other Supernatural threats come at me and I would show that you don't mess with Ben Tennyson.'' stunned Ben with a serious expression.

Flashback over...

After his talk with Gwen Ben will have to keep his guard up and keep on anymore Fallen Angels or Supernatural beings view him as a threat to them. But luckily has Rias and her Peerage to helped him.

Then the bell rang and the history class was the last class of the day.

''Alright class remembered don't forget to study for your history test next week, that means your Mr. Hyoudou.'' announced the teacher.

''Yes, sir.'' said Issei with a moan face.

Everyone started picking up their stuff and placed them in their school bags and cleared out their desks. As everyone including Ben, Issei and Asia were behind they were about to leave until Kiba walked up to them.

''Hey guys, time for today's meeting.'' said Kiba.

''Oh yeah, about time.'' replied Issei.

''I wondered what about it this time?'' wondered Asia.

''Lady Rias will tell us when get to the club room.'' spoke up Kiba.

''Alright, then let's go.'' said Ben.

Issei, Asia and Kiba nodded in agreement. As they four of them walked the hallway and off to their meeting.

Occult Research Club Room:Old School Building

Rias, Akeno and Konkeo were already in the club room waiting for Ben, Issei, Asia and Kiba arrived so they can begin the meeting while they wait Rias and Akeno were drinking cups of tea while Koneko was eating chocolate.

Then a knock on the door was heard.

''Come on in.'' called out Rias.

Then Ben, Issei, Asia and Kiba came into the room and closed the door behind them.

''Oh hey there guys you finally made it.'' said Rias.

''Oh yeah, History Class was really boring.'' muttered Issei.

''Come on, Issei wasn't that bad.'' assured Asia.

''I've have been study really hard for of the classes.'' replied Ben.

''If seems you're doing your best here at Kouh Academy.'' commented Akeno with a smile.

''Yeah, I'm doing my best to make my parents and grandpa proud.'' said the teen hero.

''We know that you made them very proud and we understand.'' responded Kiba.

''All children wanted to make their parents proud.'' added Asia.

''Yep, I would try that and keep my guard anyone or anything Supernatural that try to killed me.'' stated Ben.

''You've got that right.'' compliance Konkeo.

''Speaking of the Fallen Angels you have detected anymore of them?'' asked Issei.

Ben shook his head meaning 'no.' ''I haven't felt them following me in 2 days since then. I don't think this Kokabeil won't send more of them after the last group failed.''

''That's what Fallen Angels do to follow their Masters will tell them.'' remarked Rias.

''That and do whatever it takes to finished their mission to steal the humans who possessed Scared Gears.'' reported Akeno.

''I can't believe that Fallen Angels go around and kill innocent people who have Scared Gears.'' said Ben with an angry face.

''That's one of the Fallen Angels' goals that they killed Devils and Scared Gear users, so they would do anything to return to God's good side.'' explained Kiba.

''One of them killed both Issei and Asia who also possesses Scared Gears.'' added Koneko.

Ben's eyes widened in shock. ''What?! Issei and Asia were killed?!'' he demanded angrily.

''Yes, a Fallen Angel named Raynare acts as Issei's first girlfriend who killed him on their first day in order to destroy his Scared Gear called Booster Gear'' answered Rias. ''And she killed Asia by stealing her Scared Gear called 'Twilight Healing' with a ritual.'' she finished.

''Why did they killed Issei and Asia? They were not a threat?!'' stammered Ben.

''Whatever Scared Gears they possessed doesn't matter to the Fallen Angels.'' spoke up Akeno.

''They anything to go back to God.'' continued Rias.

''They'll do anything to eliminate those who possessed them.'' pointed out Konkeo

''And most of them will after your Omnitrix ever though they still think it is a Scared Gear and kill in order to steal it.'' inputted Kiba.

''Yeah but would it be hard for them to steal it from me.'' said Ben curiously pointing to the Omnitrix. ''The Omnitrix is bonded to my DNA it doesn't ever come off.''

''Wait? It never comes off?'' questioned Issei in surprise.

''Nope, a lot of people try to take it from me. The Omnitrix bonds to its user's own DNA structure so it can never be removed like removing a hat.'' confirmed Ben. ''It can only be removed by its user or its creator, luckily for those who are trying to remove it. It has a security function to prepare anyone or anything who tries to remove it from my wrist.'' he explained.

''Wow, that's heavy.'' breathed Asia.

''Wait? What if they kill you and steal it?'' asked Rias.

''The Omnitrix's fail safe protected me from dying so it's hard for them to kill me.'' answered Ben.

Rias and her Peerage's eyes widened in shock after Ben's Omnitrix doesn't come off and it doesn't let him die.

''Alright that's enough of that. Let get right on the meeting.'' spoke up Rias.

''Right.'' replied everyone else including Ben.

''Alright, as the Occult Research we make house calls, make delivery, help people who ask for Devils and deal with Supernatural threats in Kouh Town.'' began Rias.

''But tonight something really bad.'' informed Akeno.

''This one included you helping us, Benjamin.'' continued Rias.

''And that will be?'' asked Ben.

''We need you to help us to deal with a Stray Devil.'' answered Konkeo.

''What a Stray Devil?'' asked Ben.

''A Stray Devil used to be originally for a Devil as a servant.'' answered Kiba. ''But every now and then they rebel and kill their Master to gain freedom.''

''And what this one have do with me?'' inquired the teen hero.

''Well this one is a 'he' and he has been tricking human school girls and kidnapping them.'' explained Akeno.

After Ben heard that and his face turned seriously. First Fallen Angels and now Stray Devils two Supernatural threats that threatened innocent people...human people after he was a hero he always helped people who were in danger or trouble.

''Okay then, if you guys then I'm going too.'' responded Ben.

''Alright, then let's go everyone.'' commanded Rias.

''Right.'' replied everyone.

Kouh Town;Warehouse

The group of superhero and Devils at an abandoned warehouse in an old abandoned area through Rias' teleportation magic circle. They entered the abandoned warehouse from the entrance door, this place was an exhibit of some kind. There were plenty of broken boxes, but much of this was for display and how much was from the Stray to were hard to tell.

''Are sure this is where the Stray Devil is?'' questioned Ben.

''Yes, the reports said that this is where Stray Devil will be at.'' explained Rias.

''It sounds like Stray Devils like tricking humans after they run from the Master.'' elaborated Ben.

''Indeed.'' goggled Akeno. ''You're pretty smart.''

Everyone else ignored her comment.

''Okay.'' said Ben. ''Is there something else?'' he asked.

''Yes, before you can fight the Stray Devil with us. I would like you to watch my Peerage is capable of.'' answered Rias.

''Okay.'' stated Ben.

''It's here.'' said Konkeo. They heard a slight thumping.

Then a figure walked behind one the pillars it was a small young boy with black hair and blue eyes.

''Now what could we have here, a face-fal smell?'' asked the young boy. ''Mm. Something smells quite delicious as well. I wonder if it tastes sweet, or bitter girls.''

''Johnny, you little wretch!'' glowed Rias sounded angrier than they had ever heard her before. ''You betrayed your Master and ran away to fulfui the lustful wants and desires that have consumed you. Your sins are worthy of a thousand deaths. In the name of the Great Marquee of Gremory, be gone or meet your death!''

''You slut it. With my Master gone I can do I wanted to many pretty girls.'' he grinned.

''The only slut around here is you!'' yelled Ben. ''Though I suppose I'd be angry if I couldn't get any ass. Guys you must scared off by that freak between your legs.''

''This is your final warning.'' continued Rias. ''Go back to your master now.''

''Let me give you and your team of whore my answers.'' replied Johnny as he rose to his full height into a chimera.

''Benjamin.'' called out Rias.

''Yes.'' reported the teen hero.

''Are familiar with a game of chess?''

''Yeah. I'm not much at it unless I'm Gray Matter or Brainstorm.'' answered Ben.

''Devils with the title of Nobility grant the characteristics of chess pieces to each one of their servants. We have a special name for them. We call them our Evil Pieces.'' explained Rias.

''So, you're telling me this because you want to see what the pieces of chess can do.'' realized Ben.

''How'd figure out so quickly?'' asked Issei, shocked.

''I've had 6 years of weird stuff. You get used to this pretty fast.''

''Alright, let's start. Kiba!'' ordered Rias.

To the unexpected it looked like Kiba vanished at incredible speeds. As Johnny was about to attack, Kiba reappeared and sliced off his front legs with his sword.

''You see, Benjamin in this game Kiba is my Knight, the Knight Piece is capable at moving at Superhuman Speed.'' informed Rias.

''That's cool Kiba is fast. Just like XLR8, Jetray and Fasttrack.'' thought Ben only Kiba was fast and he was good at swordsman.

''Koneko.'' ordered Rias.

''Right.'' replied the little white haired girl. Koneko stepped forward just in time for Johnny to open a massive mouth between her legs. Johnny started grunting as the lower mouth started opening, Koneko forced the mouth open, Ben watched. Showing her unharmed, but definitely in need of a new wardrobe.

''In the game Koneko is my Rook. She attribute is simple. Unparalleled strength. That won't even put a dent in her.''

''See you on the flipside.'' remarked Koneko as she ripped all the teeth out and threw Johnny through a pillar.

''Like Four Arms, Humungosaur, Rath and my stronger aliens.'' thought Ben.

''Akeno.''

''Alright my turn? How exciting. I so love this game.'' reported Akeno as she seemed way too cheerful about fighting this Stray Devil. Lighting sparked her hands and zapping the Stray Devil as he was screaming in pain.

''Akeno is my Queen. Her attributes are a perfect combo of all the other pieces.'' informed Rias.

''She can control electricity? She just likes Benvictor, Feedback, Brainstorm, AmpFibian, Shocksquatch, Buzzshock and Shock Rock.'' thought Ben was like impress Akeno's electrokinesis.

''As for Asia she is my Bishop. Her attributes are advanced magical powers.'' continued Rias. Asia was the only one not fighting.

''Advanced magical powers, huh?''

''Issei.'' commanded the red haired beauty.

''Yes ma'am.'' replied Issei as he held his left arm. ''Booster Gear!'' in a flash of green light his Scared Gear Booster Gear appeared.

''Boost!'' spoke a voice from the gauntlet.

''In this game Issei is my Pawn.'' said Rias.

Ben couldn't help but laugh that his first friend in school is a Pawn. Issei turned to Ben with a piss off.

''Hey!'' shouted Issei. ''Just because I'm a Pawn doesn't mean I'm the weakest piece.'' He charged at the Stray Devil in speeds thanks to being a Pawn, Issei has the powers of all the Evil Pieces expert for a certain piece.

''Issei's attributes are ranked up to every Evil Pieces expert for the King which is me.'' said Rias.

''That's cool.'' thought Ben.

After Issei was finished making damages to the Stray Devil. Johnny was pretty angry at the group.

''You bastards! You gonna pay!'' he snarled.

Ben step forward. ''Hey ugly, guess what time is It's Hero Time!'' he shouted out his catchphrase.

Ben quickly the Omnitrix and already selected the icon head that he wanted and slammed the dial;his body engulfed in a flash of green light.

When the green light died down standing in his place was a 12 feet tall humanoid dinosaur-like alien with brown outer skin and tan underbelly and underarms. He wears the Omnitrix symbol on his chest.

''Humungosaur!'' he shouted.

''What are you?! How can a human like you have power like this but also turn into some kind of a freak of a monster?!'' screamed the Stray Devil.

''It's because I can and that's all you need to know now.'' replied Humungosaur.

Johnny glowed in anger and then charged at the Vaxasaurian. Humungosaur charged at him as well, the dinosaur-like alien began to punch the Stray Devil away 9 feet away. Johnny got back up and used his claws at Humunogsaur who jumped and dodged just in time. He then grabbed the Stray Devil and tossed him to the other side of the warehouse.

Johnny then gets back up again and makes his attention to Humungosaur. ''You think brute strength will keep me down?''

Then Humungosaur smirked. ''Looks like someone is cocky? I think you need to cool off.''

Humungosaur slapped the Omnitrix symbol; he was engulfed in another flash of green light. When the light died down standing in his place was a moth-like alien.

''Big Chill!'' he shouted in an eerie whisper voice. ''I think it's time for an upgrade. When it's time to go hero. Then it's time to ULTIMATE!''

''Ultimate?'' wondered Issei.

Before anyone asks what that means? Big Chill slapped the Omnitrix symbol this time four spikes popped out and a flash of green light spread through his body.

When the green light died down Big Chill's skin is recolored red, his wings and antennae have a flame design, and he had a crest over his eyes with the same design. He wears the evolved Omnitrix symbol on his chest.

''Ultimate Big Chill!'' he shouted in a gravelly voice.

Rias and her Peerage's eyes widened in shock and looked at the Evolved Necrofriggian in awe.

''What the...?'' moaned Koneko.

''Whoa...'' muttered Asia.

''Cool.'' grinned Issei.

''Ultimate...'' stunned Kiba.

''Big Chill.'' stammered Akeno.

Rias on the other hand was speechless.

''Ha, ha. ha.'' laughed Johnny. ''Don't think that a new look is gonna save you...''

''Think again.'' said Ultimate Big Chill.

He opened his mouth, but instead of Big Chill's ice breath, Rias and the others knew, they saw red flames burst out..Johnny's eyes widened as the flames came at him. The Devils expected the flames to burn the Stray Devils but instead found them all to be encased in a huge chunk of ice.

''Fire so cold it burns.'' explained Ultimate Big Chill with a hint of smugness in his voice.

''Alright then. How about we get it with them.'' stated Rias as a red magic circle formed right in front of her. ''Game Over.'' Black and Red Lighting crackled off the circle, engulfed Johnny destroying him in the process.

In a flash of green light Ultimate Big Chill transformed back to Ben.

''Wow, she's amazing.'' commented the teen hero.

''Yep, Rias is amazing. They called her the Queen of Destruction'' explained Kiba.

Ben nodded.

''Hey, Ben what with the Ultimate Big Chill thing?'' asked Issei.

''The Omnitrix have a function called the Ultimate function which evolved my transformations into their Ultimate forms giving them new powers and make them more powerful.'' explained Ben.

''Wow.'' breathed Kiba.

''That's cool.'' admitted Koneko.

''I have another function, but I'll show it another day.'' responded Ben. ''Anyway it's getting late we should head home.''

''You're right. Okay everyone go, on home.'' reported Rias.

''Alright, I'll see you guys at school tomorrow.'' said Ben as leaves the warehouse so did everyone else.

Underworld...

''What do you mean the one who defeated the Diagon is attending school with Rias?'' a man asked Sirzechs. The man has the appearance of a middle-age and handsome looking one with long crimson hair that is tied into a loose ponytail with a black hairband and he has bright blue eyes. He also has a short red beard or stubble. This was Zeoticus Gremory, father of Rias and Sirzechs and the current head of the Gremory Family.

'' Rias told me that he transferred there a few days ago.'' answered Sirzechs.

''That's good and have any Fallen Angels attacked him.'' asked Zeoticus.

''Yes. Rias said that two groups of them attacked him on his second and third day of school. But he managed to defeat them and asked them why they were after him.'' answered Sirzechs. ''And that he joined Rias' club.''

''Then the Fallens told them why they were after him?'' inquired his father.

''The one who wanted him dead was Kokabiel. Father.'' replied Sirzechs.

''That's not good.'' replied Zeoticus. ''Those who don't see him as a hero and want him dead.''

''Don't worry, Father. Rias and her Peerage are doing their best to help this Tennyson person and he'll help them.'' reassured Sirzechs.

Zeoticus smiled and responded. ''That's my daughter. The day is coming in 2 days. It's the future for us Pure-Blooded Devils.''

''Is too bad that she doesn't have pieces to complete in the Rating Game.'' stated Sirzechs.

''Don't worry my son, you're the King of Hell after all. I'm sure this Tennyson person will help Rias and her Peerage prepare for the Rating Game.'' smiled Zeocticus.

Sirzechs nodded and smiled. ''I guess you're right, Father.''

''Unknown to them the figure was watching them from the shadows.

''So, Ben Tennyson has formed an alliance with the Gremory Devils. When the time has come for my plan no one will stand in me.'' laughed the figure.

A/N:Well that is for Chapter 4 readers I hoped that you guys enjoyed and liked it. It's looks like Ben has his first battle with a Stray Devil and this an OG of mine I'm really hoped that you liked that fight.

Anyway in the next chapter is the one you've all been waiting for Riser Phenix will arrive.

Tell me that you wanted Ben to fight Riser in the Rating Game or at the Engagement Party?

Anyway that is for now see you guys in the next chapter bye for now.