Well, seeing as no-one has done anything...
I propose this as a plot and give till saturday( my time) for anyone to give complaints, suggest changes etc.(which you should, as I just took the plot so far and edited minutely)
After that, we should assign parts for script-writing.
Scene 1 - Main Character, (let's call him billybob for now, so that we HAVE to come up with a new name when the time comes), wakes up and does his morning routine in what he things is a beautiful mansion which he bought on the outskirts of town. (We later found out that it was an abandoned wreck that he just sort of meandered into.) He has all kinds of imaginary (once drawn) servants and guests and everything. Perhaps he asks one of his maids to clean something up downstairs, but is dismayed to find, once he gets down there, that it is still a mess. (this is obviously because she doesn't exist.) Throughout the scenes, things don't quite add up.
Scene 2: He enters the town, where people avoid going near him. People talk (well, tehy sing) about him behind his back. Everyone spreads whatever the latest rumor is that they've heard about him. He makes his way to his love's house (we'll call her mary-sue) to give her flowers, but one of her brothers answers and tells him to go away. He sneaks around the back of the house and gets her attention at the window, but she is equally disgusted. After all, mary-sue's family is one of the finest and most genetically pure in town. Her father is on the eugenics board, etc. ( at this moment it should be introduced that they are celebrating the fact that mary-sue's sister is pregnant.
Scene 3: mary-sue's father gets to work at the eugenics counsel. In the course of a meeting, the subject of what to do with billybob comes up. (note: they will NOT sing "what do you do with a problem like billybob - how do you catch a cloud and pin it down?") The trouble is, the plot of land where he lives does not fall under their jurisdiction. In order to arrest him, they are going to have to catch him doing something dangerous or illegal.
Scene 4: Billybob is back at his "mansion" with mary-sue, but we soon find out that mary-sue is just the drawing-version of mary-sue. Billybob is ecstatic, but we start to see how mary-sue is artificially infatuated with him, and how this isn't really going to work. At the end of the scene, well, let's say this is when we find out she's just a painting. He leaves the house, and says "you can't come with me, you have to stay here with the other paintings." or something.
Scene 5: Something happens that makes mary-sue warm up to billybob
Let's say that's the end of Act I
Act II then -
Scene 1 - Now that billybob is out of his mansion, mary-sue's two brothers go sneaking around his property, remarking "what a dump" - and they sing about how he thinks it's a mansion but really it's just an abandoned property that he occupied. They go inside and search for contraband, finding only paint splattered everywhere and maybe some rancid food and a bunch of large rats or something. There are paintings of mary-sue EVERYWHERE. But they don't find anything of any use to their father, so they leave and are glad to get out of there.
Scene 2: Back in town, there is a romantic scene (which I refuse to write) where mary-sue and billybob really start connecting. In this scene, they discuss how mary-sue's sister's baby ougt to be a prodigy(because of the family's superior genes)
Scene 3: Once mary-sue gets home, her father asks her brothers what happened. Then the three of them start pressuring mary-sue to help them arrest billybob.
Meanwhile, back at the "mansion," billybob starts getting tired of fake mary-sue and they get in a fight. By the end of the fight, she threatens to "kill the hoe" who is detracting billybob's attention. That night, when fake mary-sue is asleep, he sneaks out to meet the real mary-sue.
Scene 4: this is the meeting where he scares her by telling her that a fake version of herself is going to kill her. After he leaves, she decides she will have to turn him in.
Scene 5: (billybob doesn't exist anymore, and his house has been demolished.) Mary-sue's sister gives birth, but the baby is declared mentally defective, thus the tragic ending .
mary-sue takes the baby(it reminds her of billybob, and she feels guilty about causing his death), saving it from "extermination". She flees and vows to raise the child.