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Well, then we use counter methods. This is what you do. You talk to David, call him up CRYING. Especially if he's an uber sensative guy. Cry the whole time you're explaining this situation to him, even blow your nose for effect. Then, if he's sensative ((as a lot of gay guys can be because they're kinda like women in some respects)), he'll go to your Mom and say that he can't go becuase he doesn't want to ruin your night or something like that.

Then we have plan b. You walk up to your Mom and put it simply. Tell her "Look. You won't let her stay here, fine. I will find a place with a friend, and you won't share in my funtastic prom evening. Sign the permission slip and get the hell out of my life. This isn't about you, IT'S ABOUT ME! If you've got a problem with that, you can talk to my guidance councelor."

Now, prior to this, find a friend who will let you stay with them, and explain to a guidance councelor that you fell your Mom is being wicked unfair and you'd appriciate it if (s)he would chat with her if you can't convince her. If you cover all these bases, then plan b just might work. As for the slip, then just forge, or write David's name in pencil, erase, and change it. Sneaky sneaky.

If none of the above work, then tell your Mom to kiss your a**, you'll just go to your girlfriend's prom and not your own. And once again, make her feel guilty and excluded. If your Mom is the kind of mother I think she is, she'll HATE to be left out of this "most godly important night" of your life. And I'll keep thinking of more ideas as the day goes by if those won't work. xd

Dude.. how about I have a "friend" of mine kidnap them for the night? No but seriously, get a friend of yours that's a guy to sign her up for his date, go to prom with friends (or so you'll tell your mom), and just meet up with her there. I dont see any reason why that shouldn't work.