Your POV:
You were in your house in Gehenna with your brothers: Amaimon, the Demon King Of Earth; Mephisto, the Demon King Of Time and Astaroth, the Demon King Of Rot. You all looked quite young as if you were still in high school but in reality you were all about 1000 or more years old. It was quite weird how you were all demon kings that could control demons but still looked like a person in their third year.
"We should pay Assiah a visit brothers," Amaimon grins.
"You know it would be quite weird for the demon kings to just go to the human world but eh, why not!" You exclaim energetically.
"You're still the energetic (Y/N) like before!" Astaroth chuckles.
"I agree because after all you are the (Y/N) we always knew but anyways lets go to Assiah!" Mephisto says also pumped up.
"Alright!" You grin as you start to make the portal to Assiah.
Soon the portal is made and you look at all your brothers and you see them all nod. Soon you all jump into the portal into a black vortex. You were all swirling and twisting around until you landed in a field. You looked around and you realized that this wasn't the place you normally landed in. You stood up and looked around more carefully and you soon also realized that you and your brothers had landed in a field near a school!
"Brothers I don't think we're in Assiah," You say to your fellow demons who are still lying down in the field.
"Who cares, lets explore this place!" Amaimon says excitedly.
"You barely get this excited Amaimon," Mephisto chuckles.
"Do you think we should go to this school?" Astaroth says.
"Wait what!?" Amaimon, Mephisto and I shout.
"I mean like why not because anyways there are some hotties here!" Astaroth drools while staring at a crimson haired girl and a black haired girl walking into a building, both having really big boobs.
You look at your other brothers who nod and you all beat the shit out of Astaroth for being a big-ass pervert.
"Yeah we should ask if we can attend however we should keep our identities as demon kings as a secret obviously," Mephisto states.
"Yeah I agree, lets go out to somewhere nearby with barely any people around first however and see we could make a uhh, lets say hideout underground," You say seeing all of your brothers nodding.
"Well then lets go!" You shout excitedly and you all climb up the fence around the school and rush out to find a good spot.
Time Skip
After a while Amaimon calls you all via mobile that he has found the perfect spot. You all soon meet up with him near a hill that has already been dug up with the help of Amaimon's 'Behemoth'.
"This is perfect!" You say excitedly as you all enter the hill.
"We should cover up the entrance with foliage to make it look like nothing is in here," Mephisto says.
"I agree, I'll go get some leaves," Astaroth replies as he exits the mini cave to find some leaves.
"I've never felt this excited for so long!" Amaimon exclaims.
"I wonder how we will start our school life," Mephisto says.
"Yeah I think we should be third years when we enroll ourselves," You reply.
Soon Astaroth come back with a boat-load of leaves. He walks in and then puts the leaves in the entrance to seal of the hole.
"That should do it," he says as he sits down with you and your brothers.
"Yeah, anyways I'm going to sleep now," You yawned.
"Yeah I'm also feeling quite tired now, lets just sleep and when it turns morning we should go shopping to get our uniforms," Mephisto says tiredly.
The rest of us nod and we all fall into a deep slumber.
AN
Woo! Alright well I have been wanting to do a story like this as their aren't many Blue Exorcist + High School DxD stories out there so yeah! I hope you enjoyed the first chapter! Bye!
Wakeless

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(OLD) The Demon Kings (Blue Exorcist + Highschool DxD/DxD x DemonKingMaleReader)
FanfictionLets just say that you are a son of Satan that also possess the blue flames and is also a demon king along with Astaroth, Amaimon and Samael/Mephisto. You and your brothers (the demon kings) are all in there teens. For some weird reason you and your...