I don't know how this idea came to my mind but it did so let's see where it leads.
"Hey watch it, brat you're going to go in there no matter what He says." The marine said dragging the child behind him. "You have the blood of a demon in you and the devil's power so you. I am doing the world a favor." He muttered to himself under his breath.
"Let me go" The child whined trying to escape, "I have to go back to"
"I don't care who you think you have to go back to beast. I am taking you to the only place something like you belongs." The marine cut the child off. "Ah now for your private baptism into Impel Down," He said looking down at the boiling water. "Get in there," He shoved the child in and in a moment screams of pain were heard. After ten minutes the marine having been enjoying the screams of the child decided to move on.
"Help… me… Oniichan…" The child sobbed when the marine threw her over to the door.
"Welcome to your new home beast, you can rest assured that you will never leave this place." The marine smirked at the trembling child, who was crying. "Now enjoy level one beast" He said and threw the child through the door and heard the scream as the child fell down into the blade trees.
"Owwwww, *sniffle* Why did that guy throw me down here," The child looked around at the blank walls, "Where am I? I want Oniichan!" The child began to cry again.
Come here to me child of the sea, come and let me heal your wounds.
"Who's there" The child asked looking around, tears streaming down their face.
Listen to my voice and I will lead you to where I am, you are used to your abilities yet.
"Okay" The child then began to follow the voice down a hall and toward a hole in the ground.
Come down here child of the sea and then I can care for you. Come to me. The child looked doubtful at the hole but then noticed the pain everywhere starting to hurt again and began crying even harder. Not giving it a second though the child jumped down the hole and landed with a splash and everything went black. Welcome child of sea, I was worried for you. Sleep and recover in safety. You may not be able to leave this place now but one day you will leave here. What belongs to the sea always returns no matter how long it takes.
The child rested in the water, the burns, from the boiling baptism as the marine called it, disappearing. One thought going through the child's head before sleep took over, 'Why do bad things always happen to me. First Papa was hurt and then had to leave, then I lost one Oniichan and now people want to hurt me. Oniichan I promised to become a pirate and to be free… will you save me so I can keep it?' Darkness then took over and everything faded away.