I love Leah x Maleficent so so so much!!!
Gonna nerd out about fairy tales for a bit:
In some versions of Sleeping Beauty Carabosse (evil fairy before Disney) helps the king and queen to be able to conceive a child. This in combination with Carabosse being a man's role traditionally in the ballet comes off with Maleficent always being very trans coded to me, implying some relations with Leah.
Plus, if Maleficent were to have assisted in the conception of the child, it gives more reason for her to be angry with Leah and Stefan for not inviting her to Aurora's christening, and want to take her away from her parents. If I were a fairy and someone didn't appreciate my gifting them with a baby, and wanted to exclude me from public life and being seen with that baby and them, I would be pretty miffed too. Especially if I had caught feelings for the dutifully married queen.
I do think that this makes the story significantly sadder though than Maleficent just being vindictively murderous about not being invited to a party. A lot of transforming the queerness of villains from coding into text is like that though, which is part of why I think it's important to queer up the more het coded "good" characters too, queer people deserve some happiness!