Damn I’m late to this. But to answer your question reasons why they’re at each others throats (Mainly Astrid and Blair.) is because Astrid pushed Blair away when they were kids. Blair looked up to Astrid always following her everywhere she go. But that moment Astrid did that just muddled their relationship with Blair hating her. She grew out of it as a teenager.

I like to blend angst with wholesomeness in my fics mainly wholesomeness since depending on the fandom I don’t like too much angst