What Were You Doing Out There in the Dark?

AU post OOTP. Dark. Arthur had been right about Fudge employing Percy to use him, but he'd been wrong about what for. He's forced to confront it when he catches sight of his son's battered figure in the dark after the fight. A secret love affair turned violent? An attempted murder plot? An abusive relationship? A marriage? TW: noncon, abuse, toxic relationship, infidelity, slash.