Reincarnation in DxD with wishes

I wake up in the morning and look at myself in the mirror. At 1,30cm, I'm tall for my age, but I take pride in it, especially in my meticulously cared-for crimson hair. Although my facial features still carry a youthful look, I'm confident that as I grow older, I'll be able to charm many hearts.

Now that I've gained the power to protect myself from most threats, I can finally relax. I can spend time with my little sister, whom I've neglected. With this thought in mind, I head to Rias' place.

Theo: Hey Rias, what are you up to? Want to play together? Do you want to play a game?

Rias: Hmm, it's not like I need you. I haven't forgotten what you did to me.

Theo: Okay, I'm sorry for what I did. Can we pretend like it never happened?

Rias: I'll forgive you this time, Onii-chan, but if you do it again, I won't talk to you.

Theo: Okay, it won't happen again, I promise.

And we play games with Rias until it's time for lunch.

When it's time for lunch, everyone gathers. Today, my brother, who usually keeps himself busy with work, is here too. This time, he's accompanied by Grayfia, who's dressed in a maid outfit as usual, playing her perfect maid role.

As we eat, my father speaks up.

Zeoticus: Son, how are you? How are your training sessions going?

Theo: They're going well, Dad. Training is progressing smoothly.

Zeoticus: Good. Do you remember our discussion?

Theo: Hmm, which one? Oh, the one we had before. Yes, I remember, Dad.

Zeoticus: You and your sister will develop your power of destruction together. Grayfia will be responsible for your training.

Grayfia: You can count on me, my lord.

Hmm, more training. I'm starting to get bored. At least I can spend time with Rias.

That day, I returned to my room and thought about what I could do and learn. I enter my mind palace, where there's so much to explore. As I wander around, I stumble upon shadow manipulation. I decided to learn it, even though it'll be difficult for DxD, but I'll teach it to myself after Grayfia trains us for the power of destruction.

The next day, Rias and I meet Grayfia at the training ground.

Grayfia: Can you keep up with my training, young lord?

Theo: I believe I can, after all this time. If I couldn't, I would've stopped training long ago.

Grayfia narrows her eyes.

Grayfia: From now on, call me Grayfia Sensei. After all, I'm responsible for your training.

Theo and Rias: Yes, Grayfia sensei.

Grayfia: Young lord, how about a sparring match to start? It'll help me assess your level.

Theo: Alright, let's start then.

{It's time to show a little power}

I put my left hand behind my back and raise my right hand towards Grayfia.

I don't want to drag this out, so I'll finish it quickly.

(The Limitless is closed, it doesn't want this technique to be learned for now.)

Theo: Come on.

Rias: Go get him, Grayfia sensei!

Theo: I didn't know you liked me so much, Rias.

At that moment, Rias sticks her tongue out at me.

Grayfia: Okay then, we'll only fight hand-to-hand to see your level.

Grayfia rushes towards me, she's very fast. Rias, who's watching from the side, can't see her move. She tries to kick me in the head, but it feels like it's happening at a snail's pace.

{Maybe she's holding back. Hmm, understandable, after all, she thinks I'm just a normal seven-year-old boy.}

I easily block her with my left hand and sharpen my right hand. (Like Killua) I make a very quick move towards her, each move creates an afterimage, and I stop my move before it reaches her throat.

(My nails are a little sharp, so a little blood comes out)

(Although I want to make a Superman reference, I stop myself, DO YOU BLEED? Ah, it feels good to let a little of my inner otaku out)

After that move, Grayfia's eyes widen.

Grayfia: I didn't know you were this strong.

Theo: Oh, you underestimated me, Sensei Grayfia. Otherwise, I would've lost already.

I say this with a small smirk on my face.

Even though this smirk seems a little scary, she doesn't say anything.

And that day, she teaches us about the power of destruction.