Another idea!

[Jjhw2028]

Superheroine is defeated and used on live television. Not only is she used but, by the end, she enjoys it. Her secret identity is revealed. All of this goes viral.
She is thoroughly humiliated and there is no escape. She has no job, she has no superheroine career left, people mock her when she goes out, the justice league has abandoned her.
She puts all of her time into finding the villain who did this.

This can all be explained via dialogue and it can open with her finding the villain.

She comes at him full of rage and, again, he defeats her. He destroys her spirit to the point of her having a breakdown. Then he gets sympathetic. He tells her maybe she just isn’t meant to be a superheroine or lead dual lives.

He fucks her and she gives in and let’s herself enjoy it. He tells her that he just bought a porn studio and to have her headline it would be good for both of them. She ultimately agrees.

She becomes the most popular/famous porn actress in the world.