Demon, demon lord

Overbearing loyal dog devil x high mighty calm and cold swordsman, as a pair of lover's forced to part in their previous lives, in this life at last both of them meet, the cold swordsman has lost the memories of his past life, the domineering devil turned into an attached, loyal dog, you don't like my devil's appearance? Then I'll become a cute pet and accompany you! Want to eat sweet candy? Come and follow this super sweet candy series!

After experiencing death as the first human sacrifice in history, I vowed to never reincarnate and roamed the spirit realm for centuries.
But when I opened my eyes, I suddenly found myself in a physical body!
The damned mages summoned my spirit against my will and sealed me inside a doll!
As I took down the mages and reminisced about my days in the spirit realm, the passing Demon Lord made an unexpected proposal.
The Demon Lord will grant me permission to enter the afterlife if I become the butl