[Honestly, the fangs probably look natural with how sharp Katsuki's canines usually were anyway. He can't blame him for not noticing, and it gets a small smile from him when Izuku talks about how he normally doesn't mind the sun. He can always count on his nerd to know every little detail about him... his own personal historian.

That might end up dangerous if he and Mike ever meet. The embarrassing stories Izuku can tell...]

I'm fine for the most part.

[That sounds more ominous than he means, whoops. Katsuki reaches up to scratch the back of his head as he continues. Feeling awkward because he wished he didn't have more bad news to give Izuku.]

But I, uh... don't freak out. Okay?

[He's going to freak out--]

I found out the hard way that vampires are real. And they're just like how they are in the movies.