Human Dom! Cross X Sub! Nightmare | Treasure

The legend of the Prince of Darkness and Negative feelings.
It's a well-known legend across all AU's.

It was many, many, many, many years ago.
Back when there were Sirens, Mermaids, Vikings, and even Dragons.
When every Mythical creature was alive.

During that time lived the most powerful queen; Oya.
She's known for protecting her kingdom and making sure the feelings were protected.
She soon found love and fell in love with a sailor.
Oya was soon pregnant with two babies.

After the children were born, they had taken in her powers.
One protecting positive feelings and making sure everyone was happy, and the other protector of negativity and making sure everyone was aware.
But... Sadly, the smaller one, the prince of negativity had disappeared without a trace, leaving their kingdom greatly damaged.

Many years after the Prince's of Negativity's disappearance, a deadly captain was known across all the seas; The Dark Captain.
He was seeking something; something no one would ever dare to seek; The Diamond Apple.