Previously on Presence of the Supreme Omni God,

Y/n - Despite on your efforts on fighting earlier, I'd say you need some refreshments. Don't worry about that, I'll prepare them. Oh before I forgot, Issei.

Issei - Yes?

Y/n - Teach me how to boost someone's power or myself.

Issei - Anything for you, Y/n.

Y/n - Thanks, best friend.

With that, all of you went back to your home to celebrate.

Now

Setting: At the dining room.

Everyone there including you is celebrating feast happily although as you saw Issei is devouring the food vigorously that leaves into a surprised group while you only chuckled. Issei noticed them and said,

Issei - *as he swallowed his food* What's the matter, guys?

Rias - Oh, nothing. It's just that, you eat the food so fast that a normal person can't do it.

Y/n - Hehe. That's a Saiyan for you. Saiyans love food so much. They say, "Food is life". That's why Issei suddenly grow his appetite when I turned him to a Saiyan.

Issei then finishes his food, he drank some water after that he stand up and said,

Issei - Hey, Y/n.

Y/n - Yes?

Issei - Can you explain to me what is Balance Breaker and Juggernaut Drive that Ddraig is talking about.

Y/n - Ah yes. You should definitely know this. Balance Breaker also known as the Forbidden Move, is the evolved form of Sacred Gears in which their full powers can be released. Balance Breaker is often triggered by high emotions combined with a change in the heart or spirit of the wielder. It can also be activated when the user is faced with a disadvantageous situation. The Balance Breaker is the most powerful manifestation of all Sacred Gears in which the possessor's feelings trigger this evolution. Once reached, the Balance Breaker can be entered again far more easily than the first time. With proper training, it can be maintained for longer periods of time, as with the case of Vali as you saw him earlier transforming to that form in instant.

Issei - I see. That's why Vali can transform to his Balance Breaker form in instant. What about Juggernaut Drive?

Y/n - Juggernaut Drive, also known as the Dragon of Supremacy, is a special ability of the Longinus -Boosted Gear, your Sacred Gear and Divine Dividing, Vali's Sacred Gear. The Juggernaut Drive temporarily removes the seal placed on the Heavenly Dragons, but the users will lose their sanity while their lives are devoured by the power. Juggernaut Drive contains a curse made up of the negative emotions of the past possessors of the Boosted Gear and Divine Dividing that influences the current user to enter this form. The curse of the Juggernaut Drive can be permanently removed if the hatred of its past possessors are dispersed. After its first activation, the Juggernaut Drive leaves the Sacred Gear in a state where its past possessor's thoughts have been released.

(Keep in mind that the definition of Balance Breaker and Juggernaut Drive are not mine. They are belonged to the rightful owners. The website that I have searched is Fandom.)

Issei - I understand. So Juggernaut Drive is a last resort move isn't it?

Y/n - Yes it is. If you manage to control your Balance Breaker and Juggernaut Drive then you are completely unbeatable even the Great Devil Kings, Archangel Michael and Azazel can't beat you plus your Saiyan blood.

Issei then gasped in shock as he heard those words.

Issei - A-Are you s-serious? But what about the leader of the Chaos Brigade, Ophis, The Ouroboros Dragon?

Y/n - I'd say you can beat her in a probability of 50%. If you are lucky then your win rate is 70% when you achieved fully controlled Balance Breaker and fully controlled Juggernaut Drive. In terms of my power, I'd say you are nowhere to my power.

Issei - Yeah. I know it. That's why I'm going to train so hard to surpass them. Oh yeah, you said to me that I'm going to teach how to boost your power or someone's power.

Y/n - Yeah. Are we doing it right now?

Issei - As soon as possible.

Y/n - Great! Let's head to the balcony and train there.

Issei - Right!

Rias - Can we go too?

Koneko - Yeah, I want to see my boyfriend teaching you. Not to mention I'm surprised that you need someone to teach you even though you are the most powerful being in the whole multiverse.

Y/n - Trust me, Koneko. Your boyfriend's teaching will be useful to me and to others as well. If we are done, I promise, I will boost your power, Koneko.

Koneko - Really?

Y/n - Since you praised me, you deserve a gift from me. You said while smiling to her innocently while Issei is glaring at you.

Issei then tap your shoulder and he said,

Issei - Remember Y/n, Koneko-chan is mine. So don't you dare take away from me.

Y/n - I know. I know.

Koneko giggled and said,

Koneko - I wouldn't mind to have Y/n with me as long as it's okay with Issei-senpai. She said while smiling.

Issei - What?!

Y/n - See, Issei?

Issei - Alright. It's fine with me Koneko-chan.

Y/n - Really?! Thanks Issei.

You then kissed Koneko in her cheeks as a gift from you in which she blushed furiously and she thought.

Koneko's mind - 'Y/n kissed me! Y/n kissed me! I'm so happy!'

Rias - Are we still going to the balcony or are we going to make scene here? She said impatiently.

Akeno - Oh my. Someone is jealous here.

Y/n - Don't worry Rias, I will also give you a kiss.

You then kissed Rias in her lips.

Y/n - Does that satisfy you, my beloved Rias?

Rias - Totally. She said happily.

Issei - Come on guys, let's go to the balcony. I will teach Y/n.

Y/n - Right. Right. Sorry for that Issei.

Issei - Nah, it's okay. He said while smiling.

With that, all of you then went to the balcony to teach you how to use Boost.

To be continued...