Fics like Day and Night (specially night)

When the Soviet state needs to marry off its brilliant but unbonded Omega scientist, Valery Legasov, to stabilize the Chernobyl crisis, hardened Alpha Boris Scherbina volunteers—for paperwork's sake. He expects a liability, not the quietly competent man who turns their bleak quarters into a sanctuary, or who shivers until Boris shares his bed for warmth. But when Valery’s traumatic heat hits—all agony, no desire—the paper marriage shatters. Boris’s instinct to protect ignites, forging a real bond built on scent, shelter, and the fierce, quiet vow to guard the most fragile mind in the zone from a world that has done nothing but break him.

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