Fics like Sage Advice

Roboute Guilliman thought he could control his feelings for Yvraine, his brilliant, beautiful ally-with-benefits. They're different species and ancient enemies, so there can never be anything more between them. But all that was before a Slaaneshi Sorcerer dragged open Guilliman's darkest fantasy—a peaceful, loving future with Yvraine by his side. Now the master of logistics has to face the facts, and the foe he's always struggled most against...his fallible, human heart.

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