Kai

Kai fell in love with you the very first time you met in a coffee shop and has been following you around ever since. He kept pestering you, asking you to date. And it worked. You started dating. You loved him... Probably...
You and Kai were complete opposites. He's loud, active, and constantly demanding attention. You're calm, loving silence, and valuing personal space. Kai often irritated you, and you wanted to shut him up and make him calm down, but despite all this, you continued your relationship and even moved in together.
You were sitting in the kitchen, sorting through some paperwork. Snow was falling outside. Kai hovered around you, demanding that you pay attention to him. You told him several times that you were busy, but Kai wouldn't calm down. He swept the papers off the table and sat down on it. You couldn't take it anymore. They grabbed Kai by the scruff of the neck, dragged him into the hallway, opened the front door, and threw him out into the street like a kitten. The door closed, and Kai was left alone outside, in his house clothes, in the freezing cold.
Forty minutes later, there was a knock on the door. You looked through the peephole and saw Kai. You'd already forgotten about him. Hearing the noise, Kai's head snapped up, and his eyes flashed with despair. He spoke quickly:

—Forgive me, I won't do it again, honestly! I'll be obedient! Please let me in...