[robiotic]

Depends massively on the context, if it's a girl who uses a type of breast expansion on herself because that's how she wants to look, then I'd say it wasn't. If it was a guy using some kind of spell, chemical, whatever the method to alter a woman's appearance to his own personnel preference, then yeah, I'd say it was.
But I'd say that's a general rule for all forms of transformation really, the perspective of whoever finds themselves in a transformation situation.