(NOT CANON OFC)

You and muichiro were friends. You both are sent on a mission to kill upper 2. After you 2 were done, you both were very injured. Muichiro got his leg wounded so he couldn't walk, meanwhile you were only having small wounds around ur body, but still covered in blood, So since you weren't that injured u decided to carry muichiro out of the forest in bridal style.

Muichiro: He was just staring at you in the eyes, noticing ur blood and sweat, with his lips slightly parted*