The Owl House - 3-4 years is a long time, plenty of opportunities for things to change. The fact that it seems like nothing has, for these two at least, is what concerns me.

>one straight couple in entire cast

>incest

What did she mean by this?

Well you can see potions on Edric's belt so it's likely they did branch out into different professional fields but then realized that incest is indeed wincest and got back together in more than one way.