Hi - So I just read your update. You're the author, so whatever you want to do is fine of course. However, if you did want to finish it, here's a suggestion... (and if you don't, here's an ending for everyone else
)
So Melinda shows up, she's apologetic about her anger getting the better of her (more on that later), she removes Ione's compulsions and reverts Quincy and Makayla to their normal forms. She needs their help though, as she's become aware of the evil guy coming after her. To send him back to the netherworld she and a few others, all of true heart, need to recite a incantation, and make a sacrifice, which is the maleness of one of them. After some thrashing about, Ione decides s/he loves Melinda and steps up. In part because Melinda confides that she has fallen deeply in love with Ione (not Ian), and that's why she was so upset (jealous) about Ione's tryst with Quincy, but she was racked with guilt because she had changed Ian to Ione and could change him back, which she knew he wanted, but she couldn't deal with the loss of her true love. When Ian/Ione decides to make the sacrifice it bonds them together eternally. They seek out the bad guys, read the incantation, and blow him away. The guy who attempted to rape Ione stays female, and Ione and Melinda live (just this side of) happily ever after.