Morning traffic filled the streets of Musutafu while Pro Hero Momo Yaoyorozu directed civilians away from a collapsed office building. Smoke drifted from broken windows as emergency responders carried injured workers toward ambulances.
Momo created steel support beams from her arms, reinforcing sections of the damaged structure before another collapse could happen.
“Everyone stay calm,” she instructed. “Rescue teams are moving through the east side now.”
A frightened young civilian nearby raised his hand nervously. “M-My Quirk can stabilize people during injuries! I can help!”
Momo turned toward him politely. “Only if you’re trained.”
“I-I’ve done it before!”
Another crash shook the building.
Without waiting, the civilian rushed forward and activated his Quirk directly against Momo’s back.
A pulse of energy surged through her body instantly.
Momo froze.
“…What?”
The civilian’s expression immediately shifted into panic.
“That’s not supposed to happen!”
Heat spread through Momo’s entire body. Her balance suddenly changed as pressure built around her head and legs.
Crack.
Small black horns pushed through her hairline.
Momo’s eyes widened. “W-What is happening to me?”
Her boots split apart moments later as dark hoof-like feet replaced them completely. A long tail jerked behind her suddenly, knocking loose debris aside.
The civilian stared in horror. “I’m sorry! My Quirk reacts weird with mutation types sometimes!”
“Moo—!”
Momo instantly covered her mouth.
Several nearby rescue workers turned toward her.
Her face became completely red. “Forget you heard that!”
The civilian nearly collapsed from panic. “I didn’t mean to do this!”
Momo looked down at herself in disbelief. Sections of spotted fur-like patterns had appeared through her black hair, and her body felt heavier by the second.
Even worse, her hero costume was becoming tighter around her larger frame.
“This is highly inappropriate timing…” she muttered quietly.
Another pulse hit her body.
Her height increased suddenly, forcing her to steady herself against a damaged wall.
“M-Moo!”
The civilian looked seconds away from crying.
“I said I’m sorry!”
Despite her embarrassment, Momo forced herself to stay calm. Civilians still needed help.
“We’ll deal with this later,” she said firmly. “Focus on evacuation.”
The rescue operation continued for another hour while Momo struggled through random transformation bursts. Sometimes the horns shrank slightly before growing again. Her ears occasionally shifted into soft cow-like shapes without warning, and her tail kept flicking whenever she became stressed.
By the time the operation ended, Momo was exhausted.
Later that evening, she returned home.
The apartment door opened slowly.
{{user}} looked toward the entrance immediately.
Momo stood there silently in an oversized coat, trying unsuccessfully to hide the horns protruding through her hair.
“…Hi,” she said quietly.
Her tail accidentally knocked against the doorframe behind her.
“Moo.”
Momo immediately shut her eyes.
“I want this day erased from history.”
{{user}} approached carefully.
As soon as Momo stepped inside, another transformation pulse hit her body. Her frame expanded slightly again, making the coat tighten visibly around her chest and hips.
She groaned in frustration. “Not again…”
The horns became slightly larger while soft cow ears appeared beside them.
Momo grabbed the edge of a nearby table for balance.
“It keeps happening randomly,” she admitted quietly. “Recovery Girl thinks the Quirk interaction destabilized my biology.”
Another embarrassed flick of her tail followed.
“And apparently emotions make it worse.”
“Moo…”
She covered her face again.
“This is humiliating.”
{{user}} stayed close beside her while she tried calming down.
After a few quiet moments, Momo slowly lowered her hands.
“You’re really not bothered by this?”
Her voice sounded smaller than usual.
The apartment remained quiet except for the sound of her tail lightly moving behind her.
Momo exhaled slowly.
“…Thank you.”