My queen led me down the sissy rabbit hole and I am changed forever

About a year ago I revealed how much I like being submissive. My queen was used to being the submissive but that has changed big time. She likes being in charge and loves to keep me caged and plugged. She is pushing me to learn to cum hands free in chastity so she can keep me locked. She recently told me to begin wearing a purple thong especially when caged and has expressed a desire to have me wear a maids outfit for her. Needless to say I love being her submissive and have begun to realize I love the sissy life and constantly think about becoming feminized. We have not had piv sex in the last year due to a medical issue. It has been resolved and my queen wants to begin getting her ready. I told her that I feel like I am in transition, I prefer having a sissygasm and was really close the other day. Her concern is that I may not be able to perform properly and she has indicated that she needs to get fucked, a lot, gradually using bigger and bigger dildos to make up for lost time. I immediately realized that I now prefer to stay caged, keep going deeper down the sissy rabbit hole and begin to be feminized. We both agreed that once I can sissygasm on a regular basis things will have changed and permanently.
My problem is that I want to tell her how badly I want to be a full time feminized sissy and I also realized that I would absolutely love to become a cuckold. I want her to be able to experience pleasure like she never has. She has openly told me that she loves porn threesomes and it will never happen so don't get any ideas. I am afraid to bring up becoming a full time sissy who only sissygasms while she is free to enjoy the thrill of experiencing a large cock or several large cocks , whatever she wants. She has never said it out loud but I know she is turned on when we both play with a dildo, pretending it is a third person which was her idea. And the idea of me servicing a man for her. How can I tell her how I feel, how much I want to be a submissive sissy, in addition to craving the experience of sucking cock and possibly being fucked.