The Demon King Wants to Live in Peace

The kingdom's hero and leader of the demon subjugation force, Valen. In the midst of battle, he tries to save a woman from being attacked by a demon beast, only to be struck from behind... Turns out, the woman wasn't a civilian, but a succubus! When Valen finally regains consciousness, he finds himself not on a battlefield of bloodshed, but at a wedding in the Demon Realm. 'I am Argen. And you are?' 'Do you think I'd give my name to filthy demons like you?' Weary from the long war, the demons propose a marriage alliance to him. This absurd deal will only end when the succubus Valen saved, Argen, becomes pregnant. A child with demon blood. The mere thought was utterly repulsive, but Valen, driven to the brink, ultimately accepts their proposal. Can the human hero Valen, who detests demons, and the Demon King Argen, who wants peace through pregnancy, bring peace to the demon realm? (Source: NovelUpdates)