Stories about self bondage

Supergirl Kara is bound and gagged by the enigmatic magician Mira Vesper, who gradually weakens her through intense physical and emotional domination, turning her superpowers into a source of vulnerability. As Supergirl struggles against Nth-metal ropes and crotch rope nano-bots in public spectacles and auctions, she becomes increasingly overpowered, experiencing extreme pleasure intertwined with pain until she is sold for $520 million to the sinister Dr. Liora Voss, leaving her powerless and humiliated before an audience of eager spectators.