That's exactly the problem I've also talked about. In most of these stories there's no conflict at all to make the transformation, all characters seem to go along and no matter how extreme or strange the situation is they just go along with it.
But to be honest, I think the main target for these comics are the people that just want a good, quick, fetish story with lots of sex images, they don't care how real or feasible the story is they are here for the porn...