Got the introduction to it up, had it go a bit long to set the table for the story. Was thinking of having Greg end up looking like this when it's all said and done, just need to add a black blazer and glasses to it.
http://cdn.milffox.com/milffox/p/na/Photos/pic-1310/pic1.jpg
For the progression of the changes the idea I had in mind was that they'd gradually change physically, their clothes will change, and their minds, personalities, and memories will be gradually overwritten with who they're becoming.