-The next day-
The students are waiting for their next class, Eraser King told them they would be surprised by who the teacher is, so they're pretty hyped up.
They get quiet in anticipation as the door opens. A tall blonde man walks in, he wears a blue hero suit with red gloves and golden shoulder pads, and he also wears a cape. All the students are in awe of him, some shouting in unison. "It's All Might!"
"Now now, there's no need for such a reaction, we'll be meeting each other often from now on, seeing as I'll be teaching you practical heroics. So let's get right to it" He says already walking out the door.
They soon arrive at the same training area where the entrance exams took place. "Today's task will be simple. We'll be dividing into pains of heroes and villains, then the heroes will try to deactivate a bomb inside the building while the villains will try to protect it, the villains get 40 minutes of prep time."
"So now let's get to it." He begins to pull out slips with the student's names. "The first match will be the villain team of Lucifer and Butcher against the hero team of StarLux and Leviathan."
"It's showtime, hehe" Butcher walks to All Might. "Oi, Symbol of peace, wouldn't mind a little chat, would ya?" Lucifer waits behind Butcher, while they talk.
'Oh No No No No' Lux screams internally as she reluctantly walks towards Madow.
Madow immediately asks All Might "Can I switch teams?" To a resounding no, as it would be unfair to the other classmates.
Madow and Lux just stand next to each other for the whole 40 minutes, trying to pretend the other doesn't exist.
StarLux walks in front going to the main entrance, while Leviathan is walking up a wall by using water to stick his feet on it.
"For real, is that really necessary?"
"I'll go from above, you go from below."
"As long as you stay away from me, I'm good."
"That's why I'm going up in the first place."
As Leviathan is walking by the third floor, the wall explodes in a ball of fire. Throwing Leviathan away, but he manages to pull himself back by using water tentacles.
His foot was then grabbed by a hand and pulled into the building. He wraps a water tentacle around the arm but is slammed into a wall, managing to cushion himself with water.
"Hello, Sunshine" Lucifer smiles at him.
"Morning, star"
Lucifer starts to turn more demonic, growing taller and sprouting wings, which he uses to fly them deeper into the third floor. It's extremely hot in here and the ground seems to be full of sand. The water starts to turn into a trail of steam due to the heat.
Lucifer Slams Leviathan into a wall, he again reduces the impact with a water cushion. "So how about we get serious?" Lucifer responds with a smile, his wings then start to burn in a bright flame, while Leviathan begins to produce water at maximum output.
"My turn now." Leviathan turns the trail into a long rope of steam to pull himself out, dragging Lucifer by the water that's around his arm. They fly out of the window, Leviathan using his rope as a tentacle to slam them into the wall of the building, kicking Lucifer in the chest.
Leviathan makes water come out his feet to envelope Lucifer, who jumps from the wall while spinning and grabbing Leviathan again, throwing him towards the ground. But that's exactly what he wanted, using the water that came out of his feet as a tentacle to reverse the situation by throwing Lucifer to the ground.
He goes back to the wall and makes more tentacles sprout out of it, while Lucifer hits the ground in a big smoke cloud, that seems to hurt him.
But then a blur flies out of the dust cloud, grabbing Leviathan by the neck and flying upwards. "Does your quirk have regeneration?"
"Yeah actually!" Lucifers is laughing like a little kid.
Leviathan uses water around his neck to get himself free, but is still due to the water tentacle from his feet is still attached to Lucifer, who just keeps flying up, reaching hundreds of meters in the air before abruptly stopping, throwing Leviathan upwards due to the momentum.
Leviathan embraces it by pulling himself towards Lucifer with the tentacle at the same time, flying even higher into the air, making water jets to fly even higher, with all this he barely manages to reach a cloud, flying directly into it. Lucifer flies directly at him.
Leviathan manages to change his trajectory by redirecting him with steam. "I'm pretty sure this is checkmate actually." He says while pulling himself deeper into the cloud and making it much smaller and therefore denser, making it impossible to see where he is.
Lucifer turns fully into a demon, increasing both his speed and heat, but to no avail, he can't find Leviathan and is effectively being hit from all sides constantly by the cloud, which is just getting dense and denser as they go back down.
The cloud gets so dense to the point it just turns into a giant ball of water, falling down as if it were an entire storm all at once. Lucifer decides that the only thing he can do is use his finishing move.
The fire on his wings expands into a giant fireball, that is then compressed into the shape of a burning white spear.
"That would probably do a lot of damage." The water makes a giant ice spike pointing at Lucifer.
Lucifer throws the spear at speeds that easily surpass the sound barrier, going through the water sphere as if there was nothing stopping its path, and hits the ground below.
"If it hit." Leviathan didn't try to stop the spear, he merely did his best to redirect the attack, due to the speed of the spear it only changed a few degrees, but that was more than enough. It zips past Leviathan, only leaving a burn mark on his cheek due to the extremely cold temperatures at the sphere's center.
Lucifer starts to fall down, out of energy, but Leviathan grabs him with a tentacle, taking him out of the battle.
Leviathan talks into his communicator, telling StaLux to "Hold your breath.", There's no response.
The water sphere changes shape to put its weight on the street instead of in the building, making a dome around it that then goes back to being a sphere, swallowing the building whole
He scans the whole building with his water, finding no trace of the other two, only finding a giant safe on top of the building, as he brings it up to the surface of the water sphere, it can be seen glowing from the inside.
Leviathan stands atop the surface of the water as he freezes the box and breaks it open, revealing from the inside not only StarLux but also "Oi." Butcher, holding her hostage with a gun to her head.
"Hey." Leviathan greets him back casually.
"WHERE WERE YOU, YOU DEADBEAT!?"
"As I said before, I was coming from above, so, the sky," He says while pressurizing water to shoot at butcher from behind them.
"Nice one, mate. Using a cloud to soak the whole bloody place." Butcher says while grabbing StarLux by the wrists and lifting her up, her hands start to glow from how mad at Leviathan she is.
"Lucifer was one hell of a distraction. This hot-headed glowstick went down nice and easy—just needed a bit of provocation, some mirrors, and this bloody thick metal box. Would've been a lot tougher if you two had teamed up, y'know?"
"You're right. Lux, I apologize. I'm genuinely sorry." Leviathan pauses for a second. "For having had any faith in you. You lost the 1v1, trash." While talking Leviathan is pulling the bomb towards him with water.
"YOU! Insolent little shit! You have been useless this entire time, the bomb is about to explode and you haven't done shit!" Butcher lets her go and takes off his coat to reveal a wingsuit underneath.
"Useless!? Me? at least I won my fight, you're the one who's useless. You should just change your name to uselux!." She attacks Leviathan. Butcher starts to fly away.
The water underneath StarLux gives, making her attack lose power as she sinks into the water. Leviathan tries to shoot the pressurized water at Butcher, but due to the flashbang he just took ends up narrowly missing, only ripping part of the suit.
As he is going down Butcher still manages to dodge some water tentacles and fall inside a nearby building breaking through the window. Various water jets follow him from all around the building. But as Leviathan looks down he StarLux glowing brightly.
He quickly makes an ice mirror in front of him, along with messing with the water between them to weaken the attack, as she shoots a massive laser at him, the laser is barely deflected by the mirror.
Leviathan immediately swings a giant water tentacle to throw her at Butcher, only to see that her eyes have turned completely purple and she's foaming at the mouth. He throws her back into the water shaking her into being knocked out, while he's busy with this Butcher, left the battle area, making a successful escape.
Now only leaving the bomb to be taken care of, madow swims down to where it is, thinking about if there are any complications or if just touching it might be enough, or if Butcher sabotaged it somehow, or if may- he's snapped out his thoughts when seeing the timer hit 1 minute.
"So teach, is destroying the bomb allowed?" Leviathan radios All Might.
"That I can't say, Mr. Madow. It's a bomb, just touch it to win, both opponents are out of combat." He says, having fun with what's happening. 40 seconds left.
Leviathan freezes the bomb in an ice sphere and brings it close to where the rest of the class is. "The smart thing to do would have ironically been to plant a bomb on the bomb, but it's clearly not proximity or touch-based." Viktoria and Rex are trying to hold in their laughter.
"Just touch it already, bro." Rex says while laughing.
"Therefore, the easiest manner in knowing whether it's safe would be to bring it to someone who would know, but asking directly would be against the rules, thanks for the intromission, Rex." Leviathan finally touches the bomb.
The bomb opens up to reveal a statue of All Might saying. "Hero team wins!"
(I made a drawing for this one, it's in the paragraph comment)