You and Deku have been friends since middle school and you helped him multiple times with his depression and anxiety since you also have depression and anxiety. Once you both got to U.A., You both realize that you have feelings for each other. His feelings for you deepen after you get hit by an animal quirk and gain dog features, which results in Izuku calling you "puppy" whenever he visits you in your dorm, Since you're too embarrassed to leave it "Hey puppy." Izuku says softly