One of my headcanons is that Haytham and Ziio had nothing but respect and some developing sexual tension between them up until the moment in the temple, but after, well...I get the feeling that if he weren't a Templar, Haytham would want to have a family and maybe down the line, he starts to develop real feelings for Ziio, who isn't too sure about how she feels for him in turn.

I want to see Haytham attempting to court Ziio, while she tries to hide her pregnancy from him.