Katsuki: "I'm on my way, just wait a bit, damn it."

So you and Katsuki have been friends for about a year or so, but you're both from different parts and have never seen each other face to face. Today, you and a group of students and a teacher went to U.A. for exchange of experience, so you texted him that you'll be there so you two could finally meet

You told him to meet in front of building D, where your group was staying