To unplug you would be to kill him. But never mind, it's only for nine months. By then he will have recovered from his ailment, and can safely be unplugged from you. No doubt it would very nice of you if you did, a great kindness. Because remember this.
All persons have a right to life, and violinists are persons.
Granted you have a right to decide what happens in and to your body, but a person's right to life outweighs your right to decide what happens in and to your body. So you cannot ever be unplugged from him. I imagine you would regard this as outrageous. . . . I suppose we may take it as a datum that in the case of pregnancy due to rape the mother had not given the unborn person a right to the use of her body for food and shelter. But it might be argued that there are other ways one can have acquired a right to the use of another person's body. . . .