Thank you very much for opening up in your latest answer here.
Art as therapy and exploration is very important and totally valid. And, yeah; fiction is fiction. Express whatever you need to in the safe space that is art.

The situation with your partner is definitely a tricky one that a lot of folks find themselves in.
Have you and your partner talked about exploring non-monogamy as an outlet for you to explore your sexual identity?
And, not to project, as transitioning is very important in my own life, but the idea of being with a partner who isn't fully supportive of your transitioning over physical attraction (something that is fleeting and subject-to-change regardless of intentional surgery) sounds really rough to me. Not to be too invasive, but is your relationship with this person more important than your personal life goals? Are they aware of what you're wrestling with and giving up, and how do they justify that if so?