Help!!!! Looking for a book…

this was originally posted in may…still can’t find-have looked, have searched…pretty please help me?

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Okay. Back in high school, I read a book.

It was romance.

It involved Merlin.

It was set in modern times. Kind of a time travel. Merlin was a magician in the current times.

There was a crystal cave involved. I think at some point the heroine goes back in time and does something to help free him.

At the end of the book, Merlin and the heroine are married…Merlin has lost his magic, he’s just your average, everyday guy.

They have a little boy named Arthur. The one clear detail I remember is Arthur throwing a ball up into the air and it turns into a bird.

Anybody familiar with it? I can’t remember anything else and I really want to find it and read it again.