So, jasprosesprite^2 called Davesprite their bird brother... and now davesprite and nepetasprite are prototyped together... Can jasprose still date them?????

I don’t see why not. There’s no longer a human society to consider incest a taboo so there wouldn’t be anything inherently wrong with a potential relationship between the squared siblings unless they considered it to be wrong.

Plus trolls don’t have a concept of incest and Davepeta is part troll. Although knowing Hussie, and Homestuck’s audience I’m pretty sure nothing will happen between the two characters romantically speaking in canon