Dear Mistress Linda,
Each relationship is different and may be subject to differing rules, regulations or agreements. The one thing that all mistress/sissy relationships have in common is that mistress ultimately makes the decisions and that sissy obeys. anything different and the relationship would not function properly, or perhaps would be broken.
My wife and I do not have a full-time mistress/sissy relationship and it is considered to be a privilege for me when she decides she wants me on duty as her personal maid. One thing was made very clear from when I first became her maid and that was that during these times, sex is not even on the agenda or to be discussed. My wife has no interest in having sex with a sissy, nor does she believe there should be any kind of relief whilst performing duties. In fact she insists on everything being neatly tucked away and inaccessible and between us we find that works quite well. Whilst I am bathing or worshipping her feet I confess there are stirrings but being well tucked away, they remain just that. It is exciting and incredibly pleasurable just to be allowed to serve my wife as an obedient sissy maid and I always feel both euphoric and slightly sad when the end is called to one of our sessions as determined by my good wife.