You might be looking for a BDSM AU if you're just interested in a world with dom/subs. Harry Potter fandom also has a long history of creature fics if you want going into heat/bio/mate stuff.

Perhaps you could request a veela fic with knotting or heat but no mpreg? I know I've read veela fic in the past that had elements of ABO but wasn't completely in line with the tropes.