1-cast and disclaimer

Harry Potter isn't an only child, he has or had a twin sister his parents didn't want a daughter and so when a bargain was struck with some Russians they gave her away as soon as possible, Lily Potters parents looked for their grandchild but they died before they found her. Her name? Isabella Amina Potter
who is she now? Ivanna Pacencova, The Black Widow
[the updates will be slow]
fem oc x clint barton