This is xposted from AO3, so be sure to check it out from there as well.
It's also cowritten by Mango and Sleepy, so be sure to give them credit for this as well.
"W-wait, don't go in my room! It's embarrassing!" Izuku shrieked as Mina Ashido borderline kicked his door off its hinges.
"C'mon, Midori, it can't be that ba- holy crap…" Ashido cut herself off as she attempted to process what could only be described as a hero nerd's wet dream: a row of All Might figures, put in order from least to most recent, red, white, and blue wallpaper, and finally way too many All Might posters. Mina swears she saw a shrine to the hero in the corner of his room.
"S-See…" Midoriya uttered defeatedly.
"Meh, pretty predictable, I'd say, Midori." said Mina. "Like, we all know you're a huge All Might fanboy. But, where's the spice, y'know, the razzle-dazzle?" Ashido stated, as she and the rest of the class started leaving his room. On the way out of Izuku's room, Jirou notices a notebook that had fallen off the desk, after Mina had decided to just barge into his room. She picks it up and flips it over. This notebook is different from the ones she usually sees him write in. This one is a leather bound book with a piece of paper glued to the front that says: "Copyright Lawsuits For The Future".
Jirou hesitates before her curiosity gets the better of her, and she starts to flip through the notebook. She quickly notices that there are pages and pages of what appear to be song lyrics written everywhere. She stops flipping when a song catches her eye. She bursts out laughing, gaining the attention of both Midoriya and Kaminari.
Izuku tries and fails to grab the book from Jirou. "D-don't look through that! It's embarrassing!" he says, his face red from embarrassment.
Kaminari grabs the notebook from Jirou's hands before Izuku can grab it and starts to look at what Jirou was laughing at, eventually starting to giggle endlessly at what's on the page.
"Johnny Gonorrhea a-and the Cooter Polluters?" Kaminari questions through his hysterics.
"I-It's nothing- really, let's just forget this happened-"
"GRUNKLE FORESKIN?!" Kaminari squeals, through his laughter.
'Oh, fuck me' Izuku thought to himself. "U-U-Uh- well- you see-" Izuku stopped when he felt someone lightly slap the back of his head, immediately he looked in the direction of the culprit. "Dude, these lyrics are actually good. Take pride in them, and tell us what they're about." The punk rocker said, lazily waving the lyric book back and forth, acting oblivious to how she just bopped Izuku on the back of the head.
"Well, it's about the hero I interned with." Midoriya started. "He was really old, grumpy, and cranky."
"But why his foreskin?" Jirou questions, worriedly.
"He played dead on me. The first time we met, he looked like he was lying in his guts." Midoriya tried explaining
"I mean, that's cool and all, but what exactly does that have to do with his foreskin?" Jirou chides
"I felt petty?" Midoriya tries his luck again.
"That makes sense" Kaminari dim-wittedly states
"N-nothing about this makes any sense!" Jirou says as she begins to lose her patience
"An old man beat my understanding of my quirk into me, I th-think writing a song about his d-dick is justifiable."
"UGGGGGGGGGGHHHHHH" Jirou groans loudly, while pinching her nose. Izuku and Denki turn to look at her in confusion, then immediately return to their strangely obsessive conversation about short phalluses.
"Hehe… how about a song about-"
"NOOO!"
"Whey?" "Uh, what?" both Izuku and Kaminari simultaneously say, turning to Jirou.
"Green, look. You're a good fucking lyricist, like, really fucking good. I'm great with instruments, and Chargedolt." She sighs. "I don't know about him."
"Gay vibes. D-definite gay vibes around him."
"I have you know, I'm way past gay: I'm pansexual"
"Way past- Oh, so you're just a disaster. Got ya"
"So… a-are you guys done?"
"No way! Green, you're a good lyricist, but….this would be better with… some instrumentals." Jirou explains
"Yeah… I-I'm not that good at w-writing music'' Midoriya bashfully admits
Jirou takes the notebook and plops down on Izuku's chair. Kaminari takes this as an invitation to just lay down on Izuku's bed, like it's completely normal.
"C-come on, guys. This is my room…" Izuku mumbles, utterly defeated
""Dude, come on, sit with us. There's ideas to work on here." Jirou smirks as she flips through the notebook, before stopping on a page. She turns the notebook around to face Izuku and Kaminari.
"We'll start with this one. I already have a basic rhythm in mind" Jirou taps said rhythm, using her finger on the spine of the notebook.
"Grunkle? Why that one?" Kaminari says, laying back on the bed, not really paying much attention to the notebook anymore.
"The way it's written allows us to use a simple beat as the backbone to the song. We may have a bit of trouble mixing in some drums… or should we use a bass instead?" Jirou leans back in the chair, trying to figure out the instrumentals.
"What if we have a back beat? Then we could mix in drums as we see fit in post" Kaminari proposes
"You guys… you really don't have to go through all this trouble for my stupid book…"
"It's no trouble at all, Green"
"Yeah, Mido, this seems like it could be genuinely fun! So, come on, pull-up a chair, and let's get to work."
"A-Alright, you guys, let's get to work." Izuku says after releasing an amused sigh at his new friends'(?) actions.
"Hey! Hey! These lyrics are totally written in the same pattern and rhythm as Master Of Puppets!" Denki screams excitedly
"Huh, whaddya know, Greenie wrote a parody of an almost 8 minute long song. This kinda seems like evidence as to why we should definitely make a project out of this." Jirou drawls sarcastically
"A-Alright, I s-see your point, but w-where would we even record-"
"My parents' basement is a recording studio, we have everything we would ever need in there. We can all go to my house tomorrow, and work on this" Jirou interjects Izuku's attempt at an excuse
"...Fine, let's make some music."