The heroes and The Turtles (TMNT 2014 x Avengers fanfic)(book 1).

Adeline Rachel Barnes isn't your normal teenage average girl she is the daughter of an Avenger named Sargent James Buchanan 'Bucky' Barnes or more known as Winter Soldier, at a newborn hour baby she was kidnapped by HYDRA and begin experimented with Wolf blood serum since that day, 5 weeks later her father finds her and raise her by his own on the age of 19 years she meets a mutant Turtle called Mikey.

Felicitas Cristina Barton Romanoff isn't your normal average girl she is the daughter of the two Master Assassins Clint Barton or Hawkeye and Natasha Romanoff or Black Widow at the hour born as well as Adeline she was experimented by HYDRA with Wolf blood serum since that day, she was found two days later by her determinante parents to finds their little girl or more like they have called her since she was on Natasha's belly their little spider, at the age of 19 years she meets a mutant turtle named Leo.