"Onii-chan's still asleep," I heard a voice that I immediately recognized despite my mind still being fuzzy from the deep sleep I had just been in.

"It's fine. He won't get mad at us," a second voice said.

'...That's true,' I chuckled internally.

"If you say so," the first voice replied.

I could feel one of them pulling my pants down just slightly so that my penis popped out from underneath.

"Ahhh~" the first voice sounded as she grabbed ahold of my little brother who was standing at full length and girth due to the nature of the morning. 

Gulp.

"It's so hot in my hands. And it's throbbing like crazy."

Unable to pretend any longer, I opened my eyes.

"Oh, he's awake," a beautiful girl with two-tone wolf-cut hair said. 

The color of the front and top layer of hair was black while the color of the back and bottom hair was dark blue.

This same girl who had her school shirt unbuttoned, exposing her large breasts before me was the same girl who was holding my morning wood.

Arisha was her name and she was the student president at our Academy for Future Heroes (otherwise known as Arthur Academy).

Not only did she hold the highest written scores amongst students in her grade but she also had S-rank potential and every teacher expects her to graduate as a B-rank hero at the very least.

"Onii-chan, good morning! ♡" the other voice greeted me.

That voice, the one sitting beside me with her clothes still on (for the moment as she had her hands on the top button of her shirt), was Yena.

Her boobs, still big, were slightly smaller than Arisha's.

Her skin was dark from the tan she received from the sun and her twin tails were blonde. Her eyes were light green and they naturally looked cunning.

Unlike Arisha who held the top written scores in her grade, Yena held the top practical scores which meant she was the best combatant amongst her peers.

"Good morning," I responded as I rubbed my eyes.

These two girls on my bed early in the morning were actually sisters.

Rather than heading out early to talk to their friends for a couple of minutes before the first class of the day started, these two had decided to drop by my apartment first instead.

"Did you guys come here for this?" I asked as I watched Arisha pull down her panties and use my thighs to elevate her body, positioning the wet slit of hers just above my rock-hard meatstick.

Yena shook her head.

"We just came here to wake you up but when we saw that bulge in your pants, we thought... why not?" she chuckled.

These two sisters had a nickname that everyone at the academy knew them by.

The Untouchable Sisters.

The nickname stemmed from the fact that everyone considered them to be untouchable not only in the level of success they had already achieved at a young age but also due to how many hearts the two of them had broken over the years.

The number of men that had been rejected by them was easily in the thousands.

Yet here they were — together in this messy room of man.

Arthur Academy is an academy that separates its students into five different years based on the age of their students similar to a real school.

These sisters were in their first year.

And I was in my fourth.

With a scruffy beard and smelling like I haven't showered in days (because I haven't due to how busy I've been), these Untouchable Sisters should be disgusted but instead, they were offering their bodies up to me as if I was some sort of world-class S-rank hero.

Yena who had finished unbuttoning her shirt like her sister had done before her, pulled her bra down to reveal the beauty that was her bare boobs.

Unlike the rest of her tan body, her boobs were still the porcelain color of her nature skin.

"Here are your favorite boobs Onii-chan, ♡" she said as she made her way over to where I was laying my head.

Placing one of her large mountains onto my face, she turned it so that the nipple was directly pointed at my mouth.

Opening my mouth, I swallowed the offering before me.

"Onee-chan, you sure love spoiling Onii-chan with your boobs," said Arisha. "Ahn~"

Clap. Clap. Clap. Clap.

That was the sound of Arisha's butt clapping against my thighs; like a bunny, she was bouncing up and down my penis while placing her hands on my thighs for support. 

"Can you blame me?" the older sister, Yena asked. "Look at how cute he is when he's sucking on my nipple. ♡ He's like a little baby. My baby."

With one eye, I was looking at the beautiful pair of boobs that was shoved into my face, and with the other eye, I was admiring the sight of Arisha's boobs bouncing alongside her.

As if they were capable of producing milk, I sucked on Yena's nipples with great force.

Simultaneously, I grabbed the side of Arisha's thighs and pulled her body downwards while thrusting my hips upwards.

My morning wood which was already slopping wet from her moistness plunged deep inside her, striking her baby room like a police trying to break into a criminal's home.

"Uhn!~ ♡" she moaned loudly. "Onii-chan, your cock... ahh~... it feels so good inside my pussy!"

"There there," Yena stroked my hair and said. "Good boy. That's a good boy. Don't worry, I'm not going to run away. Your favorite boobs aren't going to run away. Uhm~ Good boy. That's right, keep on sucking on my nipples just like that."

Clap! Thud! Thud! Slosh!

"Hng~ Ahhhn~ Oh my gosh Onii-chan! Mnf~" Arisha was moaning uncontrollably as our two bodies connected. "I love your cock so much! ♡ It's perfect!"

Feeling my penis start to pulsate, I took a firm grasp on Arisha's buttocks and pressed it down while pushing my hips forward.

Our flesh meshed into one another and there was no space between the two.

Kissing her womb again, I groaned, "Uhn~" as I released my first thick load of the day inside of her.

"Ha... ha," I panted as I leaned my head backward.

"Was my pussy good?" asked Arisha who had crawled forwards and was sitting on my chest. "Did it make you cum a lot?"

She was asking questions with an obvious answer.

"Arisha's pussy felt good, didn't it? Nice and tight," said Yena.

"It was amazing," I answered truthfully, feeling a hundred percent awake now.

Looking up at the two sisters who loomed over my body with blushed cheeks, pupils that had transformed into hearts, and smiles that the other students would die, I thought to myself, 'I still can't believe this is my reality now.'

How did I find myself in this position?

To answer this, we would have to go back to a few weeks ago.

* * * 

"Fuck..." I swore as I looked at my reflection.

Without anyone's assistance, I already knew what had happened to me.

Mere moments ago, I died due to a shocking revelation that my girlfriend of four years was actually a distant cousin of mine.

What was even more shocking was that she had been aware of that fact for years and had approached me in the first place because she was into incest but didn't want to date her brothers or her direct cousins because they were all ugly.

After dying, I wake up and find myself in a different body looking like a totally different person.

What other explanation is there for my situation than one obvious one?

Isekai.

Furthermore, unlike some main characters in isekai novels and mangas who find themselves in an unknown world they do not recognize, I recognize what world I'm in.

I also recognize who the reflection in the mirror belongs to.

Kory Kilefair, a side villain from the hero-themed novel, "F-rank Hero Saves the World".

"I look the exact same as the illustration the author of the novel had commissioned for the character. Fuck. And if I remember correctly, don't I die messing with the main character?" I wondered out loud.

Although it was cliche, I was about to say something along the lines of living a changed life in this world where I play a chill un-villain-istic role to save my neck when I saw something that made the words disappear and instead, my jaw dropped all the way down to the floor.

[Yandere System]

[Arisha] [S-]

[Yena] [S+]

[???] [Undiscovered Characters]

[Welcome to the world of heroes. In an era defined by heroes and villains, you unfortunately were fated to be nothing more than a third-rate side villain who was fodder for the greatest hero of all time's journey. However, through the power of the universe, we brought you back in time to change your fate.]

[When you died, you left behind a couple of people who were devastated by your death, and behind the scenes, they accumulated enough power to threaten the destruction of time and space itself. These people were oddly obsessed with you and with your presence gone, the shackles that were your very existence disappeared, and thus, their true nature was set free. What is their true nature you ask? Well, very simply they were all yandere.]

[Welcome back, Kory. This time around, the universe has granted you the "Yandere System" so that not only can you acquire the strength to break free from your fate as being a third-rate side villain, but also, help keep those yanderes of yours in check. Please. Please keep your yanderes in check or else the universe might very well be destroyed.]

Firstly, was the system mistaken?

Did it believe me to actually be Kory because based on what it was saying, it wasn't aware of the fact that I'm a person from Earth who died and took over this body?

And secondly —

"What the fuck!?"