Echoing Thunder

Riser Phenex

I stepped into Sirzechs' teleportation circle, followed by Sabito and Makomo.  They asked to come with me to "attend" the wedding.

Sabito: So we go in and wreck the place?

I chuckled as Makomo smacked him in the head.

Makomo: No!  Haven't you been listening?

Eko: We only fight back against the guards.  Sirzechs is the only one who knows we're coming, so they'll try to stop us from entering.  As for Riser... I'll deal with him myself.

The circle glowed, teleporting us outside the building.  As I suspected, the guards tried to stop us... tried being the key word.  We made our way to the main door and I walked up to it, putting my hands in my pockets and kicking it off the hinges.

Eko: Please pardon the interruption, but I object to the wedding!

Everyone gasped, staring at me.  Riser shot up, angry.

Rias: E-Eko?

Riser: Who are you, and how dare you interrupt Riser's wedding!

Oh god, he talks in third person.

Eko: Riser Phenex, I challenge you to a duel.

Riser: You lowly... you think you can come uninvited, and challenge Riser to-

Sirzechs: As a matter of fact, I invited him here.

I smirked at Riser, as the attention of every Devil in the room turned towards the current Lucifer.  Sirzechs gave a speech about how Riser didn't really earn his win, and was utterly defeated.  He only won because he threatened the life of Rias' pawn

Eko: While there's nobody I want to see burnt to a crisp more than Issei, I'll admit it was cheap.

Issei: Hey-

Eko: Shut the fuck up Issei!

Riser turned to me, an aura of rage around him.

Riser: Riser accepts your challenge.  And once he wins, Riser will take her from you!

He pointed at Makomo as Sabito drew his sword.  I held him back.

Eko: Sabito, don't do anything rash.  I'm going to be the one who rips him limb from limb.

TIMESKIP

I was getting ready to fight Riser, when Makomo ran over.  I was in a small room by myself, so nobody was around.

Makomo: Eko, good luck.  I know you'll kick his ass.

I smiled, thanking her.  I stood up, and she kissed me on the cheek.  I blushed as she ran to the door, turning back and waving.

Makomo: For luck.

With that she left.  I smirked, teleporting to the arena.  Riser was already there, with a stupid smile on his face.  He held up his arm, launching a fireball at me.  Thunder boomed and Tordenjeide appeared in my hand.  I slashed the fireball in half, rushing at him and preparing the one attack I had managed to learn from Makomo.

Eko: Water Breathing, First Form: Constant Flux!

A massive dragon made of water formed around me, charging towards Riser.  He tried to block the attack, but I slashed him in multiple areas around his body.

Riser: You little...

Fire covered the areas where I had cut him, healing his wounds.  I smirked as he ran at me.  He tried to hit me with a blast of flames, but I dodged it, slashing his forehead.  He screamed in rage, blasting more fire at me.  I had to jump back to avoid it but I grinned, yelling at him.

Eko: Wow, is that really all you've got?  You'll have to try harder if you want to beat me, dumbass.

Riser rushed out of the fire, hitting me with a massive fireball.  He began laughing, turning around and walking away.

Riser: What a fool, he thought he could beat Riser in a fight.

Eko: Oh, you were actually going all out?  Fine, I'll play your game.

Riser spun around, shocked.  Clouds began forming over the arena, despite there being no atmosphere in the Underworld.  Rain began coming down in sheets, rendering Riser's flames useless.

Eko: This is why I'm called... the Thunder Prince!

Lightning struck the ground where I had been standing, blowing the smoke away and revealing me standing there in the form I had achieved.

Eko: I decided to call this form "Blitzkrieg".  Lightning Warfare.

I rushed forward, leaving a trail of lightning in my wake.  I grabbed Riser by the neck, holding him above me.  He tried desperately to escape.

Eko: If you can heal any injury... then I'll just blow you to bits, so you can't heal!  Surrender, Riser, or I'll kill you right here.

Thunder rumbled overhead as lightning arced through the clouds.  Riser glared at me, letting his arms fall.

Riser: Riser... surrenders...

I threw him away as the crowd roared.  He rolled on the ground as the rain stopped, and I returned to my base form.  Riser rushed at me, despite the match being over... but I kicked him in the balls, and continued to walk away.  Makomo ran over to me, a big grin on her face.  She threw her arms around me, pulling me down and kissing me.  I was caught off guard, but melted into it.

Sabito: Get a room, you two.

Makomo pulled away, a massive blush on her face.  Rias began walking over, but before she could reach me, I held my hand up.

Eko: Don't come any closer.  I didn't do this for you.  I did this so Asia and Koneko wouldn't be in that bastard's peerage.  So save your thanks for someone who wants it.

She looked sad, but at this point I don't care.  I walked over to Sirzechs, shaking his hand, before the Bifrost carried the three of us home.