You had Used your Powers to Take Yourself, Tahko, and Kurumi to The DXD Universe so you could beat the shit out of Kokabiel since of course, Issei couldn't beat him and Rias' Family had to step in but you wanted more.

As soon as you had gotten there you used your powers to Erect A Large Home A 2 Bedroom, 2 Bathroom House, A Basement, an Attic, a Large Garage, and a Large backyard.

Y/n: Here you go Ladies, our new Home.

Tohka: Yay!

Kurumi: Perfect.

You then took them inside and as they explored the Place you Began thinking of how to expand their Powers to make them stronger since you wanted to make sure they could defend themselves and become nearly as strong as you, but that waited until later as you fell asleep with each Woman in your arms cuddling up to you.

The first night you were there you began to wake up and Look around to see you were in another Realm and you were surrounded by 5 Massive Dragons each of A Different Color and Element.

Y/n: Huh!? Who are all of you!? I'LL KICK ALL OF YOUR ASSES!

Fire Dragon: Calm down Human, We are not here to Hurt you.

Y/n: Really?

Earth Dragon: We are the creators and Leaders of A Realm ruled by Dragons made to escape Humans.

Y/n: Really? What is it called?

Ice Dragon: Tammabbukku.

Y/n: Seems like A Strange Name to choose.

Wind Dragon: You had been chosen as A Worthy successor to our Power, the Power of the Dragons, and our world Creating Crystals.

Y/n: Neat!

Bronze Dragon: We shall Train you to handle this power and make you so Much stronger.

Y/n: Awesome!! Let's do this!!

https://youtu.be/lYlkYkHkZxs

You are then Trained for the next few weeks learning the power of the Dragons from Tammabbukku and the power they used to create their world getting so Much stronger over time prepping for the Battle against The Fallen Angels, and soon you have Gathered the Powers of the Fire, Ice, Earth, Wind, and Bronze Dragons.

Fire Dragon: Fantastic Job you have Grown Far stronger than we ever Imagined.

Ice Dragon: As our Gift take this ring imbued with A Portion of our Powers Imbued with our Crystals used to make the world of Tammabbukku.

Y/n: Awesome thanks, Guys!

Bronze Dragon: It is only our will and your abilities that have made this possible. So Thank you. You can contact us at any time using the ring and activate An Armor such as Like A Sacred Gear.

You then Clenched your fist tightly smiling Multi colored lightning crackling from your ring Finger.

Y/n: Groovy.

The 5  Dragons all quickly disappeared as their spirits all appeared in your Ring, and you woke up checking your hand to see you had the Dragon's ring on their right as you could see the 5 Dragons in there.

Y/n: So I have the power of the Infinity Stones, Mjolnir, and The Powers of Tammabbukku. I think the girls need some Upgrades themselves, and I think I know how to do so.