I would simply state all that you have stated here. Start with how you love that your outside fits your inside and you wouldn't change it, but you grief the side-effect of not being attracted to anyone. You remember how it was to be attracted to someone and when she asks who you were attracted to last you can tell her that it was a former therapist. Instead of discussing her in detail, I would next suggest that you talk about the other 3 Ts that came after, espacially your last T and how she reacted badly towards this, and how you now fear your current Ts reaction based on this.
I would spend 1-3 sessions or such (a significant amount of time) on your fears regarding talking about your transference T and you grieving the loss of sexual desire and the conflict this causes. A significant amount of time for her to realize you are not attracted to her. Then you could move on to working through your transference to the T you had before 2021.

Of course this scenario isn't set in stone

Can I say, as a p.s., that binging and not eating are both basically the same type of unhealthy coping strategy? Just thowing that in there, if I may