I get the frustration, but the game is consistent in its story and Myriam's behavior, I brought things up little by little as she gets bolder and more assured in her sexuality and this point was always a little part of her even if choices made let the player explore it more in depth or not. I do offer choices, a lot of them, but they do stay in a range of behavior of the same character."new choice to make Myriam more your own and write her story." But in everybody's story she is an exhibitionist because : fuck you that's why.
Dev know that everyone like choice but will still force exhibitionisms on you. I already point it out but your game is inconsistent.
I know that doesn't make it less frustrating if you don't enjoy that part, but if that's any consolation, it will be the last scene on the theme (not counting specific endings on it, which will only happen by choices), once the opera event done, will go to a few more scenes to wrap chapter 5, then it'll be on with the endings chapter which will be fully tailored on the player choices (though mind the fact that some choices made during the game might have some unforeseen consequences, beside the obvious ones).