Mary, phase 1: Self-protection and its effects

Yeah, that seemed to be a viable choice. It made sense to go for my crush first. Mary was sweet, welcoming, a perfect beginning, and I wanted to give her a position in my soon-to-be harem. I could get the arrogant blonde and cute teacher later. In the end of the day, so long the Rulebook was with me, I didn't have to worry one bit. It could change bodies, rules, and even the world itself. Yeah, with this tool, I was effectively the one on top.

...or was I? A thought erected in my head. Things happened daily. Every year, roughly 35000 people die in accidents with mechanized vehicles in USA alone. I secured the Rulebook and effectively locked it to myself, but what if it was me who got into an accident? What if Truck-kun decides to come for me next? I don't wanna be iseakai'd from this place now!

I calmed myself down. There was no reason to panic. I was sitting in a classroom during my second period, not in the middle of a highway. And besides, the Rulebook was sitting in my pack, just next to my leg.

I glanced to my right, and saw that the guy whom I shared the table with, Tyrone, was writing stuff in his notebook. A glance to the left, and I saw that Emilia was visibly busy with looking at something through the window, Mary hidden behind her. Yeah, nobody would notice if I wrote a new rule. But, just to be safe, I decided to wait until the bell rang.

As soon as it did and our second period ended, I took the Rulebook out and did my best to stay in the tail of the group while we moved forward to the next class (which was English), I opened it and started scribbling quickly with a pencil. I knew the exact middle-ground between complete immortality and typical mortality.

New Rule: The Owner of this Rulebook is an esper capable of manipulation of any and all vectors around himself with his will alone. It is the most powerful gift a human can receive, and it even manipulates the tempo at which people around him age. The Owner never revealed to anyone he has the ability, and nobody suspects him to have it as both his parents never had any, either.
New Rule: 10% of humans are espers. The genes responsible for it are yet to be found. Espers have special abilities that put them a little above normal humans, however, the talents only manifest around the age of 18. Abilities they possess are not powerful with the exception of a few individuals, like the Owner.

I made the first rule to simply make myself semi-immortal. So long I wouldn't will it, I couldn't die. Not even an atomic bomb could wipe me now, as I could redirect all its power elsewhere. Lack of oxygen was a different thing, but... who would shoot a goddamn nuke at me anyway? Best thing was, this power's defensive ability was completely subconscious. This meant, even when sleeping or not paying attention, I would always live, but if I wanted to get hurt, all I needed to do is suppress it a little. In other words, as of this moment, I became Truck-kun IMMUNE!

And the reason for the second rule was simple. This way there would be an explanation for my power if I ever revealed I had it, and on top of that, 10% of people having a bit of a power would spice up the world a bit, right? Or maybe it was my anime-deprived brain. Oh well, I could always undo that rule by erasing it with an eraser.

"I am... Accelerator." I said quietly with a smirk.

"What was it?" I heard Tyrone ask.

"Nothing." I shook my head. "I just saw an anime lately I liked."

"Huh. Well anyway, isn't it a bit pointless for us to be going to English when we have our finals in few weeks?"

...and I spent a few minutes talking with him instead of thinking about what to do next. Oh well. It's not like I hated Tyrone. He was a little of a jock, but he had moments of brilliance, and even back when I was just a small nerd, he was quite nice to me.

But what about Mary? I looked around as the class gathered. Yeah, she was sitting on her normal spot in the corner of the class, roughly 25 feet from me and Tyrone. But... what was with her look? She was looking around quickly. Her eyes seemed wild, and as she glanced towards me momentarily, I noticed... a bit of fear? Or embarrassment? I couldn't tell. She quickly averted her gaze, and after a few moments, she leaned towards Emilia, and the two of them started whispering about something. And then, my eyes went a little downwards, to her breasts...

...they were bigger. I wasn't sure whether nobody noticed or something, but even from the distance I saw that they were bigger than H-cups I always remembered her with. Now, they seemed to be a large J-cup, and... what were those dark spots...? Milk...? But... how?

Suddenly, my head flashed with images I never saw. Images from book about biology. Diagrams, drawings, X-Ray images... and I came to a conclusion. Galactorrhea. Lactation without pregnancy (since Mary sleeping with anyone was... improbable in my eyes. She was sweet, but never really looked for a partner). It could increase size of breasts as well, so... it was probably it. I felt my head tingle as I looked for a possible cause.

I selected a few possible factors that could cause it. Overly stimulating breasts, hormonal inbalance, or... a tumor. No, but scratch all three, actually. Her tits were smaller just 10 minutes ago. No matter what, they couldn't grow so fast. So... it was obviously caused by creating espers...

Hmm... I would need to take a minute to think about it. Could it be that she was one? Well, 10%, no matter how one could look at it, was a pretty large number given there were roughly 7,9 billion people on Earth. Statistically speaking, in our class alone there should be at least 3 espers (safe for me). Yeah, it made sense.

Okay, back on track. Hell, maybe increasing my intelligence so much was not such a hot idea. I was starting to overthink things. I simply wanted a harem, so did I want to make an elaborate plan all of a sudden?

Suddenly, the bell rang, and Emilia got up from her seat. She walked through the classroom (and her ass swayed so much that she almost bumped into a few desks on her way), and stepped closer to the teacher. After a short, quiet talk, he nodded, and both her and Mary got out of the classroom. Wait, what?!

I felt Tyrone poke me with his elbow.

"Did ya see the size Mary grew to?"

"U-Uh?" I looked at him. So they did notice?

"Don't tell me, didn't those hooters get your attention?"

"W-Well, I won't say that..." Huh. Something was going on. I needed to get to the bottom of this, and Tyrone looked like he knew a thing or two.

"Can't blame you. Emilia's ass is quite a sight." He smirked devilishly. "But seriously man. Mary's been growing for past month, and disappearing all of a sudden at random. I'm telling you, she's an esper."

"Is she now?" I tried to control my reactions. So, it seemed I was right. "What type of?"

"Do I look like an expert to you? Ask her yourself, maybe then she'll tell you."

...huh. I wasn't expecting that. Hmm... I mean, I could just undo the second rule and keep myself an esper, but... nah. The little extra spice in how things worked was the reason why it was put in place. In the end of the day, I could simply undo Mary specifically from being... different.

But... seeing as after a few minutes only Emilia came back, I felt a bit of a tingle in my heart. Somehow I knew Mary wouldn't be coming back anytime soon. FUCK! MY PLAN!

Wait. What was I thinking? I have the Rulebook! A quick rule to allow myself to do whatever I wanted on school's grounds, and there I was, bolting through the corridors. I wasn't going to give up easily on Mary. She was too good to pass up on.

I ran through a few corridors. I needed to get to nurse's office. That was the place where it was 99% certain Mary would be taken. It was unlikely that Emilia managed to get to the headmaster's office and back in just 5 minutes, unless they both ran like crazy. No, nurse's office was just under 1 minute of a walk away. She was surely there.