CAUSTIC
"Give me some acid, Racoon Eyes!" Katsuki shouted as he chased Mina around the classroom.
"What do I look like, a cow? Get that bucket away from me!"
"Um, Bakugo-san," Yaoyorozu said, "I don't think it's very safe storing a strong acid in metal. There's a high chance it would cause a reaction."
"That's the point, Ponytail!"
The second the door opened, Mina and Bakugo bolted for their seats. The bucket Bakugo had been carrying rattled around as it settled on Koda's head, and yet, the stony-faced teen sat stock-still, hoping the teacher wouldn't notice him if he didn't move.
"Your CQC was atrocious yesterday," Aizawa snapped. "Get geared up, you'll be running hand-to-hand drills for the next two hours."
Everyone rushed for the door. Koda, bucket still on his head, rushed straight into a wall before fumbling his way after everyone else. When the classroom was finally empty, Aizawa muttered to himself and crawled back in his sleeping bag.
Under Ectoplasm's watchful eye, the class paired up. Bakugo made a beeline for Mina.
Mina blocked a punch. "I'm not giving you any acid."
"It's for the fate of humanity!"
"I'm not letting you prank Midoriya. My acid's too dangerous for that."
"Who said anything about a prank?"
Bakugo swept Mina's legs out from under her and pinned her to the floor. He grabbed an arm and stroked along the wrist.
"What the – are you trying to milk my arms?"
"There has to be a way to get it out," Bakugo muttered. "Maybe like this?"
He bent her wrist backwards, just enough to make Mina wince. Twisting underneath him, Mina freed an arm and socked him in the nose.
"Thith ithn'th ofer," Katsuki said, cradling his bleeding nose as he went to Recovery Girl's office.
At the end of the day, as Mina walked out of the school, a figure wearing a giant green mask shouted "Ooga booga!"
Mina shrieked and instinctively threw acid at the figure. As the acid ate through the mask, Katsuki scooped some into a jar.
"Yes!" Katsuki shouted, holding the jar over his head. "At long last, I can finally rid the world of the robot menace! Victory is mine!"
Katsuki cackled maniacally and ran down the street, shouting, "I've got a jar of acid, guess what's inside it!" Mina stared after him, thought about warning him that even glass couldn't hold her acid, then shrugged and went on her merry way.
That night, fearing the robots would take his secret weapon away from him, Katsuki slept with the jar cradled in his arms. He woke the next morning to the smell of burnt fabric. The jar had a hole in the bottom. The acid had not only eaten through his bed, but also the floor, the kitchen counter downstairs, the water heater, one of All for One's safehouses stashed away underground, and another three miles of bedrock.
As he stared down the hole, his mother stared up at him and shouted, "Katsuki!"
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