Harry Potter: The Malfoy-Black Secret

When Sirius was fifteen, he started having an affair with Lucius Malfoy. It wasn't supposed to be about feelings. He wasn't supposed to fall for the man. And Lucius wasn't supposed to fall for Sirius. But they're together through everything, from the First Wizarding War to the Second. And that's only the beginning. See warnings inside. [On hiatus until further notice]