That's a pairing I've got mixed feelings about, honestly. The whole thing hinges on two men who spent years in open contempt of each other, one a former Death Eater who switched sides and the other a Death Eater who never really switched at all. The best fics I've read don't just flip a switch to romance; they dig into the sheer, exhausting work of moving from hatred to a wary truce.
A lot of writers use Lucius's fall from grace after the war as a starting point. Stripped of wealth, influence, and maybe even his freedom, he's suddenly vulnerable. Severus, who's spent a lifetime navigating complex loyalties from a position of perceived weakness, becomes an unlikely guide or maybe just a bitter mirror. The alliance is born from necessity, a shared history in the Dark Lord's service that no one else can fully understand, but the rivalry simmers under the surface because their methods and moral compromises are so different.
The tension often comes from Lucius's aristocratic pride clashing with Snape's ingrained resentments. An apology isn't enough; it's about proof through action over years. The fics that stick with me show them building something fragile out of shared loss and a mutual understanding of how hollow pureblood ideology turned out to be, with the spark feeling earned rather than just a cool idea for a ship.