This plot has been going on in my head for a LONG time. But this is my first chance to type so, VOILA! Anyways, we are gonna need some kind of summary, only because I don't want to confuse anyone.
Phantom of the Opera ends just like Andrew Lloyd Webber wanted it to, with Gustav being conceived the night before the wedding. But, Raoul does not become a drunk, but he does treat Christine like crap. Raoul is fully aware of the fact the Gustav is not his, so he wants nothing to do with him. Music was banned in the De Chany house, and it made Christine and Gustav loathe him.
Erik, Madame Giry and Meg do go to New York and opened up Phantasma. Meg does not go crazy, though she does have feelings for Erik.
Well that is the background, and basically everything you will need. If some questions go unanswered, review and tell me.
Your obedient writer,
-Lonely