I kinda prefer longer pieces, myself. Some of my favorite stories on EMCSA have been long, multi chapter epics -- although a well written short piece is good, as long as it is done right, or it feels like there's an epic world just outside the window.
Not quite certain how that'd work with a bimbo piece, though. I like to see tropes deconstructed and twisted in interesting ways, my take on bimboization would probably make it literally be in their heads (the virus just makes their skin more sensitive, or the effects wear off shortly after infection) or have the victims find a partial cure which is worse than the infection (they're intelligent, but can't get anyone to believe them).
There was an interesting take on Virus/Bimboization I read a while back:
Eroticon Virus. The story went a little off the rails, and they went a liiittle bit past believability in some of the symptoms, but the original premise was that there was literally no MC. The virus was a hoax, and it was literally just a case of mass hysteria affecting a school full of students.
I still think that would be an interesting take on bimboization -- at the end of the entire epic, the heroine discovers that doctors figured out that the virus never existed, or at least didn't do what the media breathlessly said it did, only if they admitted that there would be rioting in the streets, so they just... don't. Maybe the heroine takes to selling a miracle cure called "Placeboxide" on late night TV or something.
Bimboization isn't a genre I typically follow, I'm usually of the enforced nudity, humiliation, body control type of stuff. Freewill 504, Humiliation of Jane, for examples of the latter two, May I Get Your Coat?, Jessica's Tail, and Jenny Loses a Bet for the former. There is some crossover, I suppose...