Tony Stark's daughter... wait what?

Tony didn't know he had a daughter, Lumi didn't know she had any family left after met mother dies. Well all that is going to change when tony has to adopt a child to make it look go for the company. Nobody at the orphanage knows of Lumi's bloodline until Tony wants Bruce to find out his adopted daughters real family, then the truth is revealed. Will they like it maybe not but it's life and it doesn't always works the way they want it to.

The story is better than the description. I just can't write it.
Lumi is my oc while Tony is owned by Robert Downey Jr. and or Marvel.