So to my understanding, the difference between demisexual and pansexual lies in the conditions of attraction.

Demisexuals only feel sexual attraction after a strong bond has been built. For pretty much all other sexualities ((sans asexuals)) you can feel tingly over people you don’t know well ((see: every fangirl ever)). That’s how most people are, but demis do not experience sexual attraction that way. Pansexuals simply are attracted to people of all genders.

I’m not sure, but I think demisexuals often have different romantic orientations to clarify who they can become attracted to after a relationship is established? Like, some demis aren’t attracted to all gender so they could be a homoromantic demisexual or a polyromantic demisexual and so on.

I hope this makes sense, and if I have any demi or pan followers, feel free to chime in or correct me! <3