 If you liked
Centaur no Nayami
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 ...then you might like
Kinoko Ningen no Kekkon
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Both manga in detail describe a non-human society. There are some shoujo ai elements and being drawn by the same person, they have the same cute drawing.
This manga is by the same author. It focuses heavily on world building but also on friendship and characters unlike Kinoko. Centaur also features lots of sapphic love and female-centric relationships in general. It is placed in a fantasy world but more modern and developed.