HELP!

I have been trying to find a fanfiction about Edward Cullen and Bella Swan for ever but I cannot find it if my life depended on it so I need some help.

In the story Edward is like a merman who lives on an island and eats people.

He meets Bella when she is really young and he wants her as a mate so he bites her and injects her with venom so that when she turns 18 she will change into a mermaid as well. If I remember correctly he does this process when he pulls her into the bathtub at Bella's after Bella and Charlie rescue him.

I think in it Renee and Charlie are marine biologists and they end up abandoning Bella on the island by herself (with Edward) because they can't stand it that Edward has marked her and that she will change when she is 18. Also they can't take her with them because Edward said if she leaves he will destroy the boat and kill everyone.

In the end she gets kidnapped by James (?) who is human and working for someone (but I cannot remember who) and she starts transforming but Edward ends up rescuing her. I also know in the last chapter they are married and have a child together.

Anyway if anybody knows this story or something like this story please let me know.

THANKS!