The Avenger's Siren Mate

Loki Laufeyson x Narcissa Stark x Steve Rogers

Summary: Narcissa Stark is the only child of the one and only Tony Stark. When Tony was on a business trip to Italy he met and fell in love with a woman named, Marissa Kennedy. It was love at first sight due to the two of them being soulmates, however, what Tony didn't know is that Marissa was hiding a HUGE secret from him. Tony and Marissa were married shortly after meeting and on their honeymoon, Marissa finally told Tony her secret. Marissa was a siren, in other means she was a mermaid, and one of the last of her kind.

Shortly after telling Tony, her secret Marissa ended up pregnant and Tony loved her even more. When Narcissa was born, Marissa sadly passed away in childbirth, leaving him to raise a daughter that he was not sure if she would carry the mermaid DNA or not. It was when Narcissa turned sixteen that her soulmate marks appeared and her mermaid side appeared. It was only a year and a half later after the battle of New York when Narcissa came home from the British boarding school that she meets her two mates, Steve Rogers (Captain America), and Loki Laufeyson. How will both Avengers react to finding out that they share a soulmate in none other than Tony Stark's daughter? Or the fact that their mate is a mermaid?