An alliance

At first Issei thought this fight will be a disaster, but it's a wonderful chance to power-up himself and gather more girls.

But the enemy is not just a mere fallen angel but an Ultimate-Class one plus the unpredictable Excalibur(s), a different level in comparison with Riser. Only Balance Breaker isn't enough to deal with such two powerful opponents and this is not the right time to use the stones.

However, if you can't do something alone, do it which some fellow. Which means, time to create an alliance.

"I will deal with Irina and her friend later, now i have President and everyone, plus my own "army" as backup. But to make sure, let make her join"

He is talking about Sona, Rias's other best friend alongside Akeno, as well as the heiress of Sitri Clan. She is a bit weaker than Rias but more intelligent so they are equal.

Issei swears to not use stones on his comrades (until he makes sure he is strong enough to protect them), but not the other than that.

Change the reality so Issei will meet all the Sona's team, Issei plans to do what he used to with Riser's women : mark them and make them sex slaves.

Of course, this time is not that directly as Sona's sister is also a Demon Lord like Rias's brother.

As Issei meet them, he secretly uses Time Stone to freeze the time and marks everyone except the only boy in the team. The mark this time will not turn them into sex slaves immediately but make them slowly want to be his plaything.

"You all will somehow know about the fallen angel's attack and help Rias Gremory protect the school. Also, except for the dude, all of you will think being Hyoudou Issei's sex slaves is your most wanted desire but can't let anyone find out, if he wants you to do anything sexually, you do it willingly"

"Get it"

All the girls have accepted. The only boy named Saji is Sona's Pawn and has a crush on her, but too sorry Issei is going to get the Stundent Council President.

As the Student Council is still in his control, Issei decides to have a short fun.

"Saji, get off your clothes. Sona, give him a blowjob plus sucking his ball deeply, after that Saji wear the clothes again and no one remembers this conversation"

Hope you enjoy it as your crush sucks your manhood deeply.

When Issei returned to the ORC, Kiba had gone.

"Then, the next move is finding Irina ..."

What he doesn't expect is Koneko wants to join him. She truly doestn't want to lose someone like a brother to her, so he let her join him.

And to think you can find two agents of Angel Faction on street like beggar ...

God, what have you done to the creature ?

By that, Issei has **** but treating them a lunch in the family restaurant.

"My God, this is too delicious !"

"But we accepted the devil's deal ... forgive me God. So, what do you want ?"

"An alliance. We will help you collect the stolen Excaliburs, in exchange for destroying at least one of them"

"Agree, but you devils take the responsibility for the sword(s)'s destruction"

"Xenovia, you can't ..."

"Irina ! That's true we can't get all the stolen Excaliburs back without any sacrifice, this deal is good for us"

With that, the alliance is formed.