I wanted to not follow the trope of Zuko asking Katara to stay with him but that's exactly what I wrote oh well.
Stay?
Katara wrung her hands together, hesitating before gently knocking on his door.
"Come in."
She slowly peeked her head in.
"Katara." He smiled gently at her. "I'm glad you're here- can you help me put this on?"
"Of course." She walked over to lift the robe on his shoulders. She smoothed out the lapels, lost in thought as she stared at the bandages covering his torso, protecting the scarred skin that he got for saving her.
Zuko raised his good eyebrow, "You alright there?"
"I think I'm in love with you."
Katara gasped and covered her mouth. Sure, she had come here to say that but not so suddenly.
The recovering fire bender was speechless, simply gaping at her in shock.
Katara cringed at the look on his face. "Sorry I just! Um. Wanted to tell you how I felt and I can see now it was just me, I just thought that you- because of the lightning- but you would have done that for anyone not just me of course, obviously, so um. I'll just... go."
She turned, wanting to bolt from the room and ask Toph to bury her alive.
Zuko's hand on her wrist stopped her. "Wait Katara- please! Just... stay?" His firm grip eased, giving her the option to still run away.
She bit her lip, still turned away from him. She didn't want to look at his face as he rejected her feelings.
"Please look at me."
Katara slowly turned, reluctantly facing him. He reached out and gently lifted her chin, making her meet his eyes.
"It's not just you." He whispered.