Without any hesitation, you cast the spell known as "Tassyndra's Gender Curse". It isn't the first time you use this spell to alter your gender, so it is no big deal. You know it will be a temporary change anyway, since you will be able to change back to male once you regain all your magical power.
Soon after, you can feel the first changes. It starts slowly, as your hands become delicate and your fingernails grow and become polished. The your body hair disapears, but your hair grow down to your back. Your hips widen, your arms and legs lost most of their muscle mass to become slender and beautiful. Then, your Adam's apple disapeared and your face becomes feminine and beautiful. You check it in the mirror. Not bad. Not bad at all. Finally, the main changes occur, as breasts appear on your chest and your genitalia reshaped themself to make you completely a woman. You stretch your naked body, admiring its perfect shape. You really nailed it ! The first rune disolves on your beautiful skin.
Suddently, you are surprised by a powerful, deep voice: "So, young witch, you solved the first seal. I shall reward you. Come here!" It was the Dark Master.
The Dark Master's body is very manly. Like you, he is naked, but he dominates you by its size and his aura of power. You cover your lady parts with your hands, while he proudly displays his enormous dick. You stare at him. Lust overwhelms you. Yes, he is your enemy, he is the one you want revenge against. But you want him to fuck you. To fuck you hard. You almost want to be his plaything, his sex slave.
You offer your body to the Dark Master. You welcome his huge cock in your pussy. He rides you, he fills you with cum, you orgasm and you ask for more. It isn't your first female orgasm (when you were a student at the Academy of Arcanes, you experimented sex as a woman several times), but so far, it was the best sex you ever had. You begin to think that, when you regain your magical powers, you may consider not turning back to male. You even beg the Dark Master for more sex, but he refuses. However, just before he leaves your prison, he promises: "After you break the second seal, I will come back."
Encouraged by this promise, you search for the signification of the second rune. One hour later, you know the answer: the second rune prevents good or neutral-aligned people to cast spells. So, if you want to break this curse, the only ways is to litteraly make you evil. You know this kind of mental magic is normally out of your reach. But your pussy is filled of unholy cum. Evil is already inside you, all you need is a little push and you will succumb to darkness. But if you do so, you know there is no coming back: the spell that change alignment cannot be undone. As a matter of fact, you know that if you become evil, you won't even have the desire to change back anymore, even if you could.