under lock and key

Summary: "Any idiot could see you're going into heat, Kohaku-san," Madara says, trying not to think too much about how he's now in a locked room with someone not only going through their first heat, but who didn't even know they were an omega; someone not only going through their first heat, but doing so while they're locked in a room where their target could discover them at any moment.
Rated: Explicit