In the Dark (слэш)

It's their senior year. Izuku, Katsuki and Shoto are allowed on what was supposed to be a short, easy mission—all by themselves. But when things take a turn for the worse, Izuku is kidnapped and there's nothing the others can do but wait to save him. When he finally returns, his relationship with Katsuki starts to muddle. And, well, let's just say that's where the real story begins.
 
Alternatively, neither of them realizes just how much they need each other until they're being forcibly torn apart.
 
"Stay close," Katsuki muttered, stepping closer to Izuku so he could better protect him. Izuku grit his teeth. He wasn't enjoying feeling like a damsel, but really...what other choice did they have? In their current situation, they were severely and quite utterly fucked.
"You have to leave me," Izuku blurted as the wolves began lunging again. Katsuki was now accounting for both of their backs—Izuku couldn't even stand himself upright. He was a liability. Useless. Katsuki had to leave him—it was the only way.
"You'd best shut up now, Deku. I'm not leaving," Katsuki shot back furiously. "And don't you ever even think about suggesting that again."