Back to the past?

Helping a Redhead

In the Underworld:

There was a big party going on in one of the halls in Gremory territory.

It was the "happy" marriage, at least on the part of the groom, between Rias Gremory, the heiress of Clan Gremory, and Riser Phoenex a member of Clan Phoenix.

Everyone was gathered in a beautiful and large hall where there were several pure-blooded demons who were there to witness the event.

It was possible to see the Nobility of Rias too, only they all had their stations down.

Then a magic circle caught everyone's attention facing the stage and in a pillar of flames Riser Phoenix is ​​revealed wearing a white suit

Riser: Dear Underworld nobles, please give me a minute of your attention. I would like to make an announcement on behalf of my family, the Phoenix Clan. I invited you here today because I, Riser Phoenix, will be marrying the heiress of House Gremory, Rias Gremory, and I would like you to share this historic moment with me. Now I will introduce you to my fiancée, Rias Gremory.

He said with a huge smile as he pointed to the stage

From a large crimson magic circle Rias was revealed wearing a luxurious bridal attire.

However, before anyone could do anything, the hall doors were blown open.

Issei: Well it looks like I wasn't invited to my own friend's wedding.

He said inside the dust

Everyone's eyes widened as they felt the power released by the man who was walking through the dust.

He was a tall young man with beautiful golden hair in a golden tone with a structured body and also possessed two red eyes that glowed like two rubies.

The moment he was seen, all eyes turned to him as the man's aura was majestic.

All the women, even the married ones, blushed when they saw him and waves of lust were sent to him and empowered with the power emanating from his body.

After all, power was attraction to supernatural beings

Behind him was a beautiful woman with silver hair and eyes in a maid outfit.

When everyone looked at her, they were totally in disbelief.

For the woman looked very much like the wife of the Crimson Maou

Zeifya's eyes widened as she saw her sister after more than 2,000 years of relentless searching

Issei: Looks like I wasn't invited, Rias.

Riser: YOU!

He roared in anger looking at Issei who just had a sarcastic smile

Riser: How dare you interrupt my marriage? Guards, arrest him!

All the guards quickly advanced on Issei, but before they could do anything, they were frozen in the blink of an eye.

The Demons who were the guards were in the High or Supreme Class, and yet they were instantly defeated.

Grayfia: How dare you attack Issei-sama? You filthy ones, my [King] doesn't deserve to get his hands dirty with you.

She said coldly, which sent chills through everyone.

Grayfia began to expel her power, freezing everything around her.

Issei: Come on, Grayfia, calm down.

He said calmly, which made Grayfia calm down at least a little.

???: What does that mean, Riser?

???: Hey, Lady Rias. What does that mean?