The River of Souls was the center of Hells' core. It was the demon worlds most important feature because this vast sea of water is what that feeds the hellish creatures the supplement they need to - not survive, but feel whole.

The feeling of being satisfied was more than anybody could ask for. What good were riches and warm bodies at night if you can't feel pleasure from it?

The river reflected the mortal realm for demons to find their prey then get it through a contract or by force.

The lone figure standing by the river was a demoness, looking for a new victim, starved for a soul of innocence. I deserve better than the tainted souls of the selfish. Or the unwanted annoyances lingering here. Humans are so disgusting, they lay about hoping for the world then crawl to me to make their dreams come true. Too bad once they gain the money they long for they die soon after, idiots.

She needed a new flavor, she tired of the same dullness. That's when she felt it. The familiar beating in her chest meant someone was summoning her. Hmm...how convenient. Her head leaned closer the river, demon eyes scanning through the billions of soul until the one who called her came into view.

Lifting her half gloved hand, she touched the small soul until the river presented a picture of a girl with blond hair and sad green eyes.

How beautiful.

The mortal was but a child and yet she could feel a great anguish in her. The demoness smirked as she licked her full lips, I shall have you!

Ciel, what happen? You don't smile anymore or at least not like you used to when we were little. Your so cold almost uncaring. I miss that boy who always laughed with me and dried my tears when I was sad.

I've tried and tried again to gain your happiness but it's all been for naught. Is it so bad that I want you to be cheerful ? To want help you climb the spider web your clinging to?
I would do anything for you.

Anything?

Yes, I want my beloved to know joy again.

Would you sell your soul for this boy?

Sell my soul?

Form a contract with me and you shall be protected and assisted by a demon in helping you find what trouble this boy, in exchange, once our contract has been completed your soul will belong to me.

If it means I can help Ciel then yes, without a doubt. I'll form this contract with you.

The voice sighed deeply. Such a pure heart. I shall place our seal over your lovely heart.