I'm...honestly conflicted as to whether the "female: gender bender" tag should be used here or not. Her eggs were literally transformed into sperm, and she's shot up with male hormones, but she hasn't been brainwashed yet, so she thinks of herself as a woman, and she still has her vagina.
I'll have to wait until the story develops further.
this second part to your story is amazing💗💗💗 and I also loved the ending how she has still her mind and personality
and personally I actually hope she keeps her mental self and personality because it would be interesting to see how she reacts to the two others changing when she stays the same🤔 and maybe when they leave the facility all three of them are still centaurs and it is up to her to basically keep watch on them🧐🤩
and also I love how we now have 3 different centaurs one is female one is male and one is a futanari😍🥵🤤
keep up the fantastic work you are building a very cool universe here😁☺️