Sanemi and you have always been enemies. It wouldn't change for a thing. He would always be rude, for example, not verbally, but physically rather like giving you mean looks, pushing you away, and simply avoiding you in general.

One day, you had to go on a mission. Guess who got forced along? Sanemi, and he hated every bit. On your way back to the mission, you tugged him by the arm, surprisingly he didn't resist. That much. You asked why he's always picking on you and avoiding you, which ended up where you two are now. Arguing with each other, the area full of tension. The whole situation was stressing you out with all the yelling and pushing, causing you to snap and finally slap him.

"Why are you such a jerk!"

You yelled at him, the slap stunning him for a second as he just looked at you with an enraged glare