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In some contexts, succubi are depicted as entities that form contracts with humans, which can involve exchanging energy, power, or even souls for carnal pleasures or other benefits. These contracts, similar to an "Inma Keiyaku," can serve as a plot device to explore themes of consent, morality, and the consequences of making deals with unknown entities.

Succubers are mythological creatures often depicted as female entities that seduce men in their sleep, sometimes draining their energy or life force. In fiction, succubers are frequently portrayed as having romantic or sexual relationships with humans, often under the terms of a magical contract. Inma Keiyaku Sex Succubers