I Wanted To Squeeze A Magical Girl’s Boobs So Bad I Turned Into A Monster

Several decades ago, monsters suddenly began appearing throughout the city. They were said to be mutated forms created by an abnormal expansion of human desires. Shaped like humanoid forms in solid black, they were genuine monsters acting solely on their desires without regard for others.

It was thought that humanity would be ravaged and wiped out by their overwhelming strength, far surpassing that of ordinary people, but in reality, that did not happen.

Around the same time, girls who would later be called magical girls began to appear. Thanks to their mysterious powers, they defeated the monsters, and peace in the city was maintained up to the present day.

I, Momisugi Shidaki, was also a monster.

However, unlike the usual solid black monsters, I wore a hat, a mask, and a cape. A special individual, known as a “Unique” species; a mutant monster possessing greater strength and special abilities than the average monster.

“Monster-san! Today, you must prepare yourself!”

“Heh, have you come to get beaten again today?”

Now, standing before my very eyes was a magical girl: Magical Girl Ruby. She had red hair in a side ponytail and wore a costume consisting of a white leotard with red stripes, adorned with frills around the chest and waist.

Ruby was responsible for this city, and although we had fought several times before, she had never defeated me.

She held her magical staff in one hand, watching me carefully without lowering her guard.

“I-I won’t lose today! Hyaaah!”

Ruby was the first to move, firing a magical bullet from her staff, but I blocked it with my arm. My body, possessing exceptionally high abilities even among monsters, suffered no damage.

“You don’t look any different than usual, Ruby-chan.”

“As expected, ranged attacks don’t work… In that case!”

This time, Ruby aimed to strike me with the staff imbued with magic power. She preferred hand-to-hand combat relying on speed rather than ranged attacks, but unfortunately, I was also a close-combat type.

I deflected the staff with my arm, dodged the following kick, and countered with a left-foot strike.

“Ugh…!”

Ruby’s slender body bent sharply as she was blown away, but she recovered her posture midair, landed, and faced me again. Magical girls’ costumes were made of magic, boasting surprisingly high defensive performance despite appearances.

However, the gap in skill between us was overwhelmingly large, and normally, I could have immediately followed up and defeated her, but I deliberately chose not to. After all, I had no intention of defeating her in the first place.

“As expected, you really are strong…”

“Hmm, same as always. I think it’s time to end this.”

I had no interest in prolonging the battle, nor any hobby of hurting girls. To end this quickly, I kicked the ground with full power and accelerated. Moving at high speed, too fast even for a magical girl’s enhanced vision to track, I got behind her.

“Well then, excuse me for today as well…”

I placed my hands on her chest and began to squueze it.

“Hyaa!”

Ruby couldn’t help but cry out.

“Hmm, so sweet and delightful. Truly excellent. Your breasts really are supreme…”

Her breasts, which were pushed up by the costume that showed off her curves, were a size that didn’t quite suit her slender frame.

And Ruby was still growing… it felt like they had gotten a little bigger since last time.

“S-stop it…!”

Ruby struggled desperately, but she could not break free from my grip, which overwhelmingly overpowered her. I slid my hands beneath the frills covering her chest and massaged her breasts over the leotard. The thin fabric transmitted the softness to my hands.

I couldn’t suppress the grin spreading across my face, though of course, due to me wearing a mask, Ruby couldn’t see it.

“N-no, let go!”

“Nope. Since your exquisite breasts are firmly in my hands, Ruby-chan, I’m going to enjoy this even more.”

For a while after that, I kept fondling her breasts. I did nothing beyond that, since my goal was not to violate her.

I couldn’t stop my hands from stroking her. The pleasure was stimulating my brain so much that I even thought I wanted to keep doing it forever if possible.

However, it all came to an end eventually.

Running out of magical power, Ruby lost her transformation and collapsed unconscious, reverting to a normal girl with black short bobbed hair in a school uniform.

“…That’s enough for today.”

I laid the sleeping Ruby down on a nearby bench and dissolved my transformation. I was wearing the same high school uniform as hers.

“Still, there’s something strange about groping the breasts of an underclassman from the same high school…”

Feeling a little awkward, I scratched my head and left the park.

But that feeling was not enough to suppress my monster instincts.

“Well, I’m not going to stop anyway.”

I was the “Boob Monster”, who became a monster just to squeeze a magical girl’s boobs.