To Love the Enemy

After losing a bet with Muzan (to be fair Tanjiro hadn't known that he was the king of demons at the time), Tanjiro gets turned into a demon himself... willingly.

He becomes a Demon Slayer to protect his only surviving family member, his younger sister Nezuko, but what will become of him when he is kidnapped by the enemy?

In a world where it's kill or be killed, can the angel that is Tanjiro learn the meaning of peace and love? And why is it that the enemy can show it to him much better than the man that promised him the whole world?

Staying with Muzan just gives Tanjiro more and more questions. Who is the real enemy? Why is it that the demons are nicer than the humans? Who really was the man who gifted his anscestor his earrings?

Can Tanjiro find the answers to the past, present, and future before the Corps kills them all?

Warning: Smut between demon and human and smut between two demons