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"I'm not a vampire," is something Izuku had never thought he would have to say.
Worse, he had never thought that the sentence could be a lie.
When he'd been attacked on the way home from the entrance exams, sure, he'd found it odd that the villain had chosen to bite him of all things, but he was truly too drained and beaten-down to care. He was going to fail to get into UA; what did a simple villain attack matter?
And then he couldn't get into his own house.
Izuku had to sit on the porch for hours until his mother came home from her late night shift, rain pouring overhead and his notebook shoved in his shirt to keep it dry. She'd looked at him funny, but invited him inside - only to immediately turn around and call him out on his behavior.
Inko Midoriya was the first person to figure out that Izuku is a vampire. Todoroki Shouto is, somehow, the second.
"I'm not a vampire," Izuku repeats, waving his hands in front of him. "Vampires don't exist! Sure, it's possible that someone has a vampiric quirk, but folklore doesn't dictate how it works, and it's not even certain that it would be transferable, a-and I have Superpower-!"
"Look at this class photo," Shouto interrupts, dropping it on the counter. "Try to find yourself in it."
Izuku internally grimaces as he pretends to look. He already knows he won't be there, but that could easily be played off as a glitch, or-
"And look at these training recordings," the other boy continues, and Izuku's heart drops.
He can play it off once, maybe even twice - but Shouto scatters entire folders of photos all across the tables of the communal center.
He's done for.
Oh kami, he's going to be expelled from UA, and All Might is going to be so disappointed…
But just as he's about to open his mouth and admit it, Shouto spreads even more evidence across the table.
Class reports from Aizawa (how did he even get those?), photos of All Might holding things out to seemingly nothing during times where they'd had lunch together, voice recordings from classmates that Shouto had apparently asked about all of this, and Izuku was going to actually die.
For the second time, that is.
Wait, do vampires even die when they're turned?
And then Izuku is even more mortified when Shouto slaps a full vial of Izuku's actual blood on the table. He wants to ask where he got it, but somehow he's more scared to know than he is to remain ignorant.
"Um," Izuku says smartly.
Shouto just pointedly splays his hands over the "evidence." A lot of it does actually point to him being a vampire, and then some of it is Ochako worrying about him being too light - which isn't really a side-effect of vampirism, but moreso of him forgetting to eat lunch sometimes. Oops.
"I do believe that you are a vampire," Shouto states serenely, steepling his fingers in front of him. "But I am willing to accept alternate theories."
"Alterna-? No, no, I am a vampire, but I'm really concerned about how you got some of these things."
"We don't worry about the method," the other boy argues. "Science is its own way-"
Izuku stares at him for a moment. "You literally have my blood, Shouto."
"Science."
The vampire just sighs and presses his fingers to his temples before standing up. "Yeah, sure, whatever, just don't tell anyone. And what're we having for dinner tonight, do you know? I was hoping it'd be katsudon."
"I'm cooking."
"Ah, so it's soba, got it. Uh… again, don't, like, tell anyone? Please? I really don't want to get expelled."
Shouto flashes him a thumbs up, and Izuku lets out a heavy sigh, finally standing up to walk to his room.
The second the elevator opens to the second floor, though, his phone vibrates.
I already know, Midoriya-kun!
He almost screams and faints.