Well, first of all, I'd love to contribute to anybody's game making process in any way I can. I am an avid fan of Yuri and am quite well versed in the subject. I myself am also a writer, so I often times take some time to look at some of my inspirations and try to see what I like in them. For example, there's the matter if you want your main character to know right off the bat she is a homosexual. Obviously for this jam you'd want it to be obvious to the player even if it isn't apparent to the character(s). Pieces by Takemiya Jin come to mind with characters who are outspoken with their gayness. Then you look at works like Girl Friends by Morinaga Milk or Octave by Akiyama Haru, where the main character with no prior love experience slowly (or quickly, in your case) falls in love with a fellow female (a gender previously not thought possible) and figures out their sexuality as they come to experience this love. For you, this would obviously be a more thought driven story. I'd suggest you really think about your character's personality and adjust that to how she should act to her given circumstance. She doesn't have to be likeable, relatable, or a proper representative of any certain demographic. She just has to act like a human does. How would you react to a situation? How would a friend, a family member, a rival, an enemy, an idol, and so on and so forth. We all act crazy sometimes, we cry, we laugh, but the way we do it really all depends on the what kind of person you are. Try to use a distinct voice. Talk in a way that feels natural for the character. How would this girl say something if she is talking to the player directly, or a close friend, or a therapist. That's all I have to say for now. I'd love to learn more about your story and go more in depth from there.