Ho Yay: Raffin and Bann. According to Word of God, about their relationship is her most frequently asked question.
Katsa: I told him I'm not going to marry you and hang on to you like a barnacle, just to keep you to myself and stop you loving anyone else.
Po: It's all right, you know. Other people don't have to understand.
Katsa: I worry about it.
Po: Don't worry about it. We'll muddle through. And there are those who do understand. Raffin does. And Bann.
Katsa: Yes, I suppose they do.
- Confirmed as of Bitterblue.