As being the leader of the paranormal Liberation army and League of Villains was very stressful for Tomura.

He would constantly go to meetings. He was all over the place. It's like he couldn't have 5 minutes to himself relaxing without someone barging in and complaining to him about meeting ect.

The only thing that was keeping him was you. His cat. You were always with him. The only way you were with him was because you were always on his shoulders. Why?

because you were the only thing that kept him calm during his meetings, and planing attacks for UA.

You were basically his kitty, that was with him 24/7 all day everyday, every second, minute.

He never really cared as long as you were with him and as long as he was calm. Nobody really questioned him about it either. As long as he was okay and not pissy, the day would go perfectly fine.