A group of women scientists. You've registered to be a test subject for them, and they keep you in their facility until they're done with their experiments. You sign a contract that forces you to stay for the duration of the experiments no matter what. They perform all sorts of femdom-themed sexual experiments on you, such as injecting you with chemicals with various effects, trying out various machines on you, conditioning you to have strange new fetishes, changing the size of your genitals and breasts, performing sex-changes, shrinking you, testing various sex toys on you, increasing or decreasing your sensitivity, increasing the production of your sexual fluids, blocking your ability to orgasm, adding animal features to you, measuring your sexual attributes, and whatever else they can think of.