1-   A demonous spirit were peacefully resting in their forest until a mortal stumbled into their land. The spirit decided to speak with the mortal a bit angry from being awoken.

2-   A powerful demon had taken over a peaceful village. The demon had met the lord's children or child that were unaffected by his spell and treated them as a prisoner. One day until the child helped heal demon. After that kind act , the demon took better care of the mortal for their deed and made them their queen.    

3-   Someone was partaking in a ritual for a demon worshipping cult. When the demon appeared, it became infatuated with them and decided to take them

4-   Someone accidentally summoned a dangerous demon while performing a spell

5-  A demon had mentally tortured and scarred a mortal since they were a young child. But, the demon learned that the mortal was his true mate. So the demon kidn  But one day he finds out that the mitral he tortured for years was his one true mate. So he kidnapped them from his home to be his forced mate and bride with no choice.

6-   A demon had met an innocent soul that wandered into its territory. It made the mortal come back everyday to the forest every night, in order to keep their freedom.

7-   A dangerous demon had once appeared infront of a child that came into its land. The child showed little fear of them and attempted to befriend the being instead of run in fear or cry for forgiveness. The demon/god decided to protect this mortal child that didn't fear them and slowly became possessive of them. Once the child had grown into an adult, they took them away to be their bride.

8-   A demon hunter was hired to kill a power demon, bringing their sibling with them. The demon saw the hunter's sibling and became infatuated with them. It made a deal with the sibling, if they become his wife for the hunter to live. Their brother was a demon hunter that was hired to defeat the demon. The Demon would kill his brother easily if they didn't become one of his long line of mates that becomes his wife

9-   A village had been terrorized by a demon for decades having made a tradition to give the creature sacrifices. One day while receiving its sacrifice the demon made one of the villagers come with him 

10-   A demon had been summoned to kill a family that wouldn't give the hand of their beautiful child, around sixteen, over. The demon had killed the parents but when they saw the teenager,  it took them to it's home. (Credit to for this scenario to harper_skelli_girl)