(Based on a bkdk fanfic..) they were walking back from patrol together.. when deku suddenly said "I liked you first." he said with a cocky smirk katsuki chuckled and crossed his arms "I confessed first." he said in a cocky tone. deku raised a finger "I said I love you first." he said with a proud smile.. katsuki blushed softly and took a deep breath before suddenly getting down on one knee with a ring in his hands and said.. "I proposed first.." even though he was trying to hide it, he was incredibly nervous about deku's answer.