My S+ Rank Nemesis Won't Leave Me Alone After Our Marriage Contract

Lorenzo Voss is forced into a marriage contract with S+ user Caelan, his missing sister's fiancé. Ordered by his father Magnus to spy on Caelan at Starfall Academy, Lorenzo shares a dorm with the man he vows to hate. Their fake engagement hides a truth: Caelan is with Nightfire, investigating Project Genesis. As staged hostility turns into desire, Lorenzo learns Lucia's core lives inside him—and Magnus plans to harvest it. They expose the crime and rescue Lucia, but a darker power awakens.