Izuku watched as Hagakure slowly walked off, dejected. He couldn't let this happen, he knew she must've worked hard for that place in 1a. It wasn't fair.
'Life isn't fair' the beast from within whispered in his soul, 'this is just how things go'
"No" his voice was firm but measured.
"What?" Aizawa sensei asked, his eyebrow raised as the students fell silent.
"We have all worked hard to get here, we have suffered, sacrificed and trained for this chance. Hagakure-chans quirk isn't well suited for a physical test like mine is for example but she excels in other areas. An invisible girl, the perfect hero for intel gathering. She could tail villains to their hideout and listen in on their plans without them ever knowing. Heroism isn't about who is the most fit. If you think that Hagakure here has no potential, then expel me too. I won't be learning under a teacher who throws away potential like that", Izuku's fangs itched as he spoke.
"Yes! He is right!", Uraraka shouted from the crowd of stunned students, "expel me too!"
The students mumbled amongst each other and soon, student after student declared they'd rather be thrown out themselves than watch while this takes place. Half of the class had spoken up when Aizawa sensei's grumpy expression shifted into a creepy smile, "you get it! You actually get it, that which it is all about! Heroes fight against injustice, not just villains. So far in my teaching career, not a single class has stood against me like you have. Good work… you aren't expelled Hagakure but remember, I can expel you at any moment for any reason"
Hagakure jumped at Izuku, crying tears of joy, "thank you, thank you!"
Izuku stood there, frozen stiff. She was on her period, he could smell the blood. His fangs itched and he stepped a few steps back. The beast within begged him to bite down on her neck, to take her life essence and make it his. He pulled out his canteen and took a big sip.
"Why do you keep drinking from that bottle? It doesn't look like a water bottle to me. Don't tell me your are drinking sake?! Scandalous!" Iida(the blue haired boy) gasped.
"No- it is my- well it is a mix of tea and blood", he saw the weirded out looks around him, so he explained, "I have to drink blood to keep myself from becoming feral. Close contact is… triggering. By taking a sip, I can take the edge off the cravings"
"Oh- well… you could drink from me… just a sip, as thanks for getting me unexpelled and all that…", Hagakure's voice was timid.
"You don't have to do that. I just wanted to help you"
"And now I want to help you, just this once, you can bite me", Hagakure's heart was racing, he could hear it with his enhanced senses but it wasn't fear, he knew how fear smelled like, no, it was something different.
Izuku took her by the shoulders and slowly, bit into her neck. She moaned as he gulped down a few sips of the crimson liquid. It was divine. Blood tea was nothing compared to this. He almost lost himself in the sensation. The beast wanted to drain her dry but he pulled away due to pure willpower.
"Why did you stop?" She moaned.
"What?"
"It felt so good…", Hagakure whispered before snapping back to reality, " how was it?"
"How was it? It was divine, old blood has nothing on the blood straight from the source, it-"
Izuku blinked. As the blood settled into his system, he found a new neural connection in his brain, one that wasn't there before, like By a fifth limb which he only now got access to. He used that muscle and-
"Woah- you went all invisible on us bro", Kirishima said.
Izuku looked at his hand and pulled that muscle again, his hand vanished, along his entire body, clothes and all, "woah- what is this?"
He looked at Aizawa for guidance but he simply shrugged, "it seems your quirk is still evolving. Drinking Hagakure's blood must've triggered something inside it."
"It burns blood to turn invisible, it is a nice to have but I can't stay invisible for too long without drinking more", Izuku said, his gaze shifting over the other students. Bakugo looked horrified, others looked curious and even… jealous. He knew the look all too well, he himself had worn that look for most of his life. Strange to be on the other side of that stare.
They shuffled back into the classroom. Syllabus's were handed out and most of these things were really normal, English, literature, art but also some more specialised, hero law, interrogation and -of course- heroics 101.
Kaminari was talking with Uraraka, "so what king of food do you like?"
"Mochi I guess, anything sweet really", she mused as she helped him carry textbooks in for the class.
"Do you maybe want to grab a bite after school?" Kaminari offered.
"I don't really have any cash right now…"
"No worries, I'll pay for both of us"
"Then sure! How about Ichi Sweets and ice cream? Their strawberry ice cream is heavely!", Uraraka suggested.
Izuku smiled. Making a move on the first day of class? How bold, he could never.
Hagakure cornered him after school came to an end, "Midoriya kun… I- that bite… it felt so good… I- I want you to promise me to never do it again, okay? It- it feels way too good. I've had problems with drugs, my parents are both addicts and that… that felt like the best first high ever. I want to stay sober. I don't want to become addicted to your bite, so please… don't do it again, okay?"
"Sure thing", he was almost disappointed. His beast desperately wanted to feel that again, that pure bliss that came from drinking her blood. It didn't want to let go now that it knew what a feeding, a true feeding felt like.