Kitsune no Yometori

Eight-tailed fox Hinoe, the chief of his village, aspires to be a nine-tailed fox. Yet his village is destroyed by Kayou, a diabolical, powerful nine-tailed fox from another country. Violated before his wife's corpse, Hinoe is forced to become his wife, and while he refuses, he can't resist the pleasure...

(Source: Libre, translated)