My first thought upon awakening was 'ow'. My second thought was 'Asshole didn't even try to stop'. Once the standard thoughts had been exhausted and my brain resumed its processing, my third thought was 'Where am I?', an acceptable thought, seeing as I was floating in a black void in front of what appeared to be a holographic chatroom.

EL-Greetings Oblivi Solus. Welcome to your new life.

Huh. So I died. I really should be panicking more, but for the life of me I cannot do it.

EL-You likely have many questions, so allow me to explain. Yes, you died in a car crash in your home dimension. Multiverse theory is real, and I am Evan Lagrange, a lesser entity of great power that has taken to managing some of the multiverse for fun. You may reply by thinking your statement, then thinking 'Post'.

OS- Ok, think I've got the hang of this. So, what happens now? What do you want from a recently deceased engineering student? And why do I feel so calm?

EL- That is simple. I am going to insert you into one of the many fictional universes you have read about, not as a character, mind you, but more like Navi.

OS- An annoying shit who provides useless advice and pesters the main character endlessly?

EL- Considering you are a sentient being and significantly more intelligent, no. You are to be a voice of reason to the main character, helping them avoid the occasional plot hole and get through their story in a different manner than canon. In addition, you will not be a physical being, but rather a soul bound to the mind of the main character, able to exist in their mindscape and teach them from there. Each time a universe concludes, you will return here and be prepared for your next task. Finally, I took the liberty of inhibiting your emotions for a bit to help you acclimate to your new job, don't worry about it.

Ignoring that last bit about emotion limiting, I decided to jump right in.

OS- So where am I going for my first mission?

EL- Not telling! :) Bye!

With those words, light began to engulf my body and I felt myself being pulled away through the void. As I settled in for the trip, I allowed myself some reflection. "Ok, Sol, it appears some random being has decided you will make an excellent tutorial NPC for some poor soul in a work of fiction. With any luck you'll be sent somewhere nice and easy to start, like How to Train Your Dragon, or Tangaaaaah!"

*CRASH*

"Oooooowww". How the hell is empty void able to hurt so much? Seriously, if I wasn't a construct similar to the gamer, I would have probably broken something.

"Who's there?"

"Um, Hi."

"Who are you?"

"Oblivi Solus, interdimensional butt monkey, and apparently your new voice of reason and mental advisor. Hold on one second."

I began to focus on creating a platform, pulling on essences I somehow now knew how to manipulate to form a small platform in the inky void, upon which projections of my host's body and I appeared. My host appeared to be a young boy, somewhere between seven and ten, with a lanky build, brown eyes, and spiky brown hair. My own body was taller, almost six feet, with a heavier build, both in terms of fat and muscle, and possessed curly hair instead, with the hair color and that of my eyes being brown.

"There, now we can talk to each other face to face, what's your name kid?"

"I-Issei Hyoudou…, where are we?"

"Son of a bitch I'm in the DxD universe", I muttered. High School DxD was an interesting universe, but the power creep was absurd, and I clearly had my work cut out for me.

"What?"

I waved him off. "Don't worry about it. Ok, now let me explain what I am and where we are. I'm a dead soul who has been assigned the task of helping certain people achieve their dreams by teaching them everything they need to know and guiding them on their journey, and you're one of those people. Right now, we're in a construct I created in your mind so that we could see each other face to face."

Iseei decided to give me his best attempt at the incredulous look. Which was incredulous, as it should be.

"I'm serious kid, I really am a trans-dimensional advisor genie. So kid, tell me your dream, and I'll tell you how to get there."

Issei smirked at me and said in that tone kids shift to when they think you're messing with them, "Really? Well if you're soooo smart and really that good, help me become the Harem King."

"…"

Issei's face lit up in an expression of smug satisfaction.

"Ha! I knew you had no clue, you're just a voice in my dream!"

My brain finally allowed enough processing for me to start speaking again and I got a quick statement out.

"Give me a minute."

Issei's face shifted to a certain degree of shock, "M-m-mr. Solus?"

Wow. They weren't kidding when they said Issei was perverted from a young age. Seriously, what the hell is with this universe? Anyways, building a harem ought to be fun, and I'm not going to complain too much seeing as I did have some of the same ideas, albeit when I was in my late teens and not when I was seven. Anyways, let's get the exposition out of the way and get started.

"Ok Issei, I've got a bit of a plan, but first allow me to elaborate a bit more on the current situation. You see I come from a reality where yours is a work of fiction…"

-Thirty Minutes later.

…And that's basically everything you need to know, any questions?"

Issei just stood there, staring at me blankly.

"I'm sorry, but could you please say that again? I'm starting to believe you, because I know I've never heard some of the words you just said.", he softly asked.

Ok, buffy speak time.

"You have a dragon in your left arm that gives you superpowers. Every mythology is real and is active in your world. I'm from a different world and saw your current future there."

"Oh"

Cue freakout in three, two, one…

"Aaaaaaaaaah!"

Issei began running around the small plane in a blind panic, screaming the usual statements such as, "It's not real", "This is just a dream", and my personal favorite "Get it off, Get it off, GET IT OFF!", while flailing his arm around. After about five minutes of letting him try and get it out of his system on his own, I finally sighed, walked up to him and grabbed him by the collar.

"No, it is real, and you can't remove the dragon, it's bound to your soul. Now calm down and let me get explaining everything you need to know."

Issei slowly slid to the floor and sat down, with myself following him shortly after. I pulled up a white panel next to us and began projecting images onto it.

"Ok Issei, you want a harem, right? Then you're going to have to put in a lot of hard work for it, because nothing comes free in this world and a harem is not cheap. You're going to need many things if you want one, specifically, strength, intellect, and charisma."

As I spoke the three words appeared on top the tablet, with lines between them, forming three labeled columns.

"Strength is how you protect your harem, if you're weak, then others will attack you or your harem and hurt them. Do you want your harem to be in pain and sad Issei?"

Issei's face went bone-white and he exclaimed with pure shock, "No! Why would I want that?"

A satisfied smile crept over my face, "Almost nobody does, but others will see your harem and will be jealous. They might be jealous of the fact that you can get girls, they might be obsessive over one of your lovers, they might just hate you and decide to attack you by attacking your harem. No matter the reason, you have to be powerful enough to protect them, otherwise, they'll have no reason to stick around. No matter how suave, intelligent, or rich you are. Or maybe one of your girls has an enemy from their past that you need to fight off, and since the supernatural exists, you might need to be powerful enough to fight god-level ex-boyfriends to keep them safe."

I gestured to the board and words began to appear under the strength column. I decided to have a little fun and so I summoned a pair of glasses and a wooden pointer, before resuming my speech.

"For you, your strength comes from three areas, your physical capabilities, your sacred gear mastery, and your magical expertise. Your physical abilities are things like your physical strength, mastery of combat arts, durability, speed and agility. These physical stats can be further boosted by the second category, your mastery of your sacred gear, the Boosted Gear. In essence, the Boosted Gear is the soul of a dragon bound to yours which allows you to double your power every ten seconds, and if manipulate that power. We'll get started on booting that up shortly, after the lecture has concluded. Finally, due to the supernatural nature of your future opponents, you will need to develop some talent in the magical arts. Human magic is primarily equation based, but we might be able to give you dragon magic, which is a bit easier to learn, but focuses on flame and wind spells. Spells help out due to their exponential growth, as opposed to the more linear growth of physical abilities, and their versatility."

Issei was looking a bit lost by this point, but appeared to be processing everything I just said at a steady rate. Once he seemed to start getting the gist of what I said, I tapped the second column.

"Ok, Issei, I'm going to move on to the intellect column, you good to go?" Iseei nodded in affirmation, so I straightened up and started talking again.

"Intellect is the second area you need to work in, and like strength, I'm going to break it down into three aspects, application, intelligence, and wisdom. Application is how you apply your mental abilities to the real world, and is the reason for this category to exist. You need to be smart to build the support networks required for a harem, as such a system is expensive and complicated."

Issei was looking at me funny by this point, although what normal child wouldn't be if you tried teaching them economics and finance. I decided to try and simplify my speech further.

"Let me put it this way, the minimum size for a harem is three members, and if we assume that you have a kid with each of them, that means you have three kids. The average cost to raise a child from birth to 17 years old in a country like Japan or the US is anywhere from 20,000,000 to 60,000,000 Yen, and you have to spend three times that over the course of 17 years, with a final cost of about 3,520,000 yen per year. Keep in mind, this is only the cost for any children you might have, you also have to factor in your wives, yourself, and your house. You can't support this on a part time job, and would have to cut a lot of corners to do it on an average salary, so you need to earn a lot of money. In order to do that, you need a high-paying job, and high paying jobs are typically given to college graduates from prestigious universities, or to brilliant entrepreneurs. Also, you need to be able to handle most finances yourself, so that you are seen as a column of support, rather than a freeloader. Beneath application are the two other subcategories, intelligence and wisdom. A work of fanfiction I read sums it up best, intelligence gives you options, representing the total breadth of your knowledge of what you can do in a given situation. Wisdom, on the other hand, helps you pick from what options you have, helping you make better decisions. You need to excel in both to succeed, using intelligence to think up the best option and wisdom to realize it is the best and pick it."

I tapped the third column, as Issei looked at me expectantly.

"The third aspect of gathering a harem is charisma, the ability to protect and support a harem is nothing if you cannot attract the members in the first place. It not only helps in this aspect, but also gives you connections, people with skills you could never hope to learn or didn't have time to, it helps you barter and interview so that way you can make yourself even more appealing to employers. It is the core ability for any social interaction…"

Issei looked at me, trembling in anticipation with hope. I could practically see his fantasizing of himself surrounded by beautiful ladies.

"…and I know absolutely squat about it."

Huh. So that's what a face-fault looks like in real life. Oh. Now he's looking at me depressed, great, now I feel like crap.

"Ok, so while I might not know much, you were able to grow enough on your own for this to work. Basically, the original you was kind and compassionate, always ready to throw himself at any problem to protect his friends and accept them no matter what. And that worked out fine for you. The only issue I had was how open you were with your perversion."

Issei snapped out of his funk with incredible speed, it was like he had never been affected. He then proceeded to get right in my face.

"Why should I be silent? Oppai are the best things on earth and everyone should be aware of their greatness!"

I gave him a gentle slap upside the head and rolled my eyes.

"I agree with you, boobs are great, the problem is that girls don't like it when you do perverted things in public. I'm not saying be an asexual prude, hell, you can be as perverted as you like, but perversion is like illegal activities, it's not a problem until you get caught. So the trick is to be a smart and chivalrous pervert. Never peek on girls, thank them for an accidental show, read adult material in the privacy of your own room, only exchange it incognito, and for the love of every divinity in existence, never announce out loud your fantasies while the girls in question are in front of you. So yeah, in general, being kind and considerate should work, keep your perversion stealthy, and remember to practice basic hygiene."

I stood up and stretched, feeling my nonexistent joints groan in protest.

"That should be all for tonight, when you wake up tomorrow, we'll get started on your training before school, and then I'll elaborate more on it tomorrow night. Nice to meet you Issei, I hope we can work well together in the future."

Issei looked at me confusedly, "Tomorrow's a Saturday, I don't have school"

I smiled back with a feral grin,"Even better"

With those words I began to dismiss the projections, letting Issei travel back to the world of the waking, and as light began to filter in as Issei opened his eyes, I cracked my knuckles.

I had a lot of work to do.

Author's Note: As you can probably guess, this is my first fanfic. I'm going to see what the initial reaction is before I post any further chapters, but the basic idea is that Issei will be at about mid-tier strength by the time canon hits and will have a vastly different connection structure.