I'm really enjoying this story...I hope you haven't decided to abandon it or something, since you haven't written any more for several months.
You've got me very intrigued about this curse...to be honest, I'm intrigued because the word "Latin" entered a sentence, but I'm intrigued about the curse, too.
Your grammar is quite impressive, given the typical drabble one finds on ff.net.
Do they actually have invisibility charms? I was under the impression that the closest thing they had was a Disillusionment Charm, and that's why invisibility cloaks are so valuable. If they had a charm, the cloak wouldn't be very useful, would it?
I'm posting this review on ff.net, too, in hopes that you will see it in one of the two places and write more of the story.