Prologue - 14 years ago

Fifteen years ago, Natasha Romanoff, more commonly known as Black Widow, created a genetically-modified embryo with Tony Stark's help. Before the embryo grew into a child, it was stolen and supposedly destroyed, and the Avengers mourned the loss of what would have been Natasha's daughter.
In the present day: Kira had always known she was destined for greatness, even before she found herself as Bruce Banner's intern. Moving into the Avengers tower, she discovered how to be an Avenger... possibly the most important one they have.
During her training, she found out the truth behind her mysterious past, and about secrets that were best kept lost.
*Set in the time frame between Age of Ultron and Infinity War*