You may or may not remember Felecia from my locker room story... Either way, I'd like to assure you that this isn't permanent, nor have their personalities been replaced by another's - they're just really, really, dumb, and really, really lustful. It'll last about a week. Nine months if something happens (and it's pretty much bound to), in which case they'll turn back mentally at the end, but not physically. (I might write an epilogue, later.)

These guys are slime, but that's the only way I'd do even a temporary bimboization.