I would agree totally with the above comment. I am fortunate to be able to switch fluidly between the d/s sides within me. However, I have found that I am unable to sub to more than one, but a personal comment intended to the person in mind, not a general one.
To achieve a dynamic where, as switch, you are able to be both D/s is a wonderful thing to experience. If this is what you seek, then this is possible, however, I would also mention that this takes time, trust and open communication.