you need money. so you get a sugar daddy. he promises you a huge allowance, extravagant dates, and frequent gifts. the only condition: you have to dress as a girl. he likes "femboys", he says.
he even helps you out at first, buying you slutty little skirts and cute dresses to wear whenever you see him. he gets you lacy bras and matching panties, and sometimes he snaps a few pictures of you in them before he strips them off and fucks you. you don't mind; he pays extra for that.
after a few weeks of this, his vocab starts to slip. he orders for you at the five star restaurants he takes you to: "she'll have the..." he tells you it's for your safety, after all, no one can tell you're a man when all your feminine curves are on display. then it makes its way into the bedroom: "good girl," he praises when you cum on his cock. you feel your cunt twitch; surely it's just from the orgasm.
it happens more and more: calling you a good girl, sweet talk about your feminine curves and girly cunt. you argue; but he says it's "just a kink" of his, but he needs it, and if you want to keep him (and his money) around, you'll do it. so you do. you let him call you all kinds of feminine terms, point out the biological reality of your body, and when he tells you to repeat it back to you, you do that too: "i'm a girl, and i was made for real men's cocks."
you don't even notice that he rubs you faster, fucks you harder whenever you call yourself a girl. you don't notice that he makes sure to shower you in feminine compliments every time you come. you don't notice, at least at first, that your pussy absolutely gushes whenever you you say those words: "i'm a girl, and i was made for real men's cocks." you don't notice, at first, that your girly little clit throbs every time he reminds you that only women have pussies. you do notice when you realize while touching yourself that you can't cum anymore without referring to yourself as a girl.
you tell this to your sugar daddy, tearful and embarrassed. he shushes you, wrapping his arms around you, soothing you with gentle circles over your clit. he tells you that it makes sense, that it just means you've finally accepted your biological reality, your true gender, and you believe him. he smirks, knowing he successfully conditioned you into viewing yourself as nothing but a slutty little girl, made to take his cock.