Exactly, with limitations to keep it from becoming stupid, so I don't end up becoming a stockpile of enchanted nuclear warheads that wipes out the entire world or some other ridiculous thing.
Basically, anyone with the ability to concentrate would be able to change my shape and appearance. But only one person at a time could claim the right, thus becoming a claiment or master until they lose interest, die, or someone stronger takes control.
Naturally, I would try to keep it secret, but that would be difficult as anyone could merely concentrate on me as having bigger breasts and a whorish outfit and the changes would start occurring, not immediately, but over the course of a few minutes. That person would then become my master until events changed that.
Sexual changes would be the easiest to manifest as it easier for people to concentrate on sex. Breast size, hormonal changes, nerve changes, vaginal changes, etc. But I could be manipulated deftly by a skillful master into a variety of things. Ex: Certain humaniod or animalistic Inanimate objects such as sex dolls, andriods, robot form, animals, anthromorphs of animals, hybrids, chimeras, tentacle beasts or various odd creations, forms of other people (Dooplegangers), etc. The more technical changes would require greater power and concentration.
A master would not be able to control my mind or alter my free will, I'd have to be enticed to willingly follow a masters wishes.