I'm been trying to look for it for the past hour, and couldn't find a match. Not sure if accurate, but the female protag is cursed/fated to give birth to the demon king/god, and the male protag helps her avoid that fate, but they fail in the end and the girl dies as the demon is born.
What a fucked up premise. Sign me up for reading it. @ me if you get the title. I hope it isn't shoujo, though. Not really a fan of the art style.
Ahhh, yes finally I have found it. Thank you, unfortunately it's been axed. I'm not sure if you still want to sign up, but try reading it, it's good.
Funny, I think already "finished" reading this. Yeah, now I remember. Immortal guy who desires death and his lover/friend being a concubine/princess/mother to a demon emperor and his demonic kingdom.