Dazai had brought you along to the agency with him because nobody could watch over you

Just like your brother you were a ball of energy. Running around the agency, Which stressed the hell out of kunikida.

After Running around, again. You ran past dazai who grabbed your arm and swung you into his arms

Dazai: “Calm down stinker! You’re gonna get us in trouble!” He teased, poking your side.