Succubus System for the Apocalypse

Elara, a timid librarian, is thrust into a world ravaged by demonic incursions, a world where humanity's last hope rests on a hidden system. Upon awakening the 'Succubus System,' she discovers it's her destiny to drain the life-force and desires of powerful beings, friend or foe, through intimate acts, channeling their essence to empower humanity's last bastion. This ability is a curse and a blessing; it amplifies her senses and allure but forces her into morally compromising situations. As ancient evils stir and demonic lords eye humanity for total subjugation, Elara must navigate her newfound powers and the escalating conflict, battling not only external threats but also the internal struggle of maintaining her identity in a world demanding her body and soul. Can she become the unlikely savior, or will she succumb to the system's insidious nature?