Originally Posted by Albalida

That depends on what you mean by "fairy".

The Leanan Sidhe is one example of a fairy that can form an attachment to a human, and give them inspiration. Some stories say that comes that a cost, though.

There are folktales of Selkie women who are coerced into marriage by having their seal skins stolen, and they often leave half-Selkie, half-human children behind in this world when they recover their own way back home.

If you're talking about spirits of nature, then, yes, it might be a little strange for a flower spirit to want to cross-pollinate across species. One might encounter similar incompatibility with an undine or dryan/wodwose. But, you know, relationships... you work it out, or you don't. You know.