• A young vampire, who views feeding from an unwilling human to be wrong, has parents who always attacked and feed from unwilling humans and tend to always drain them. The young vampire notices it's father draining a human and stops it's father and saves the unfortunate human
• A young very sadistic vampire is spoiled rotten by their parents and always gets what they want. What they want is a human pet, that their parents of course buy them from the black market
• Vampires(or any supernatrual/fantasy creature) have taken over the human kind, making them their slaves, for whatever they want
• Vice-versa, the humans make the vampires(or whatever) their slaves
• Mermaid/merman saves a drowning human that fell into the ocean
