Fics like This Is How You Lose a War

At first, it's only a game. A plan. A way to remind Sirius what he left behind when he walked out of Grimmauld Place months ago and never looked back. Sirius chose James. So now, Regulus will make James choose him. (Or: Regulus sets out to destroy Sirius and James’s friendship by seducing James. It works. Just not the way he wanted.)

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