Anthropomorphic, furry even but both must be animals. BL.
https://www.mangago.zone/read-manga/the_wize_wize_beasts_of_the_wizarding_wizdoms/
this author has some interesting other works too
I love bls with great plot, a lot of romance, but little to no smut. Its refreshing
Omagaverse, short line over to animal x animal, recommendations