Thor And Loki's Lost Daughters

Loki and Thor have loved each other for a very long time and had twin daughters from that love. The daughter's names were Thorn Lokidóttir and Lokia Thordóttir. Loki and Thor loved both daughters very much but only days after their birth they was stolen away by some unknown source. After that, Loki became spiteful and their marriage became a broken one....
Years later Thor meet the Avengers and Loki tried to take over the world. The Avengers had thought it was because Loki was power hungry but that thought was thrown out the window when Thor had over heard them discussing it and had corrected them.
Loki had wanted to take over the world because Loki found out, days after their daughters disappeared, that some sort of powerful human had found their way into Asgard and had stolen their daughters. After hearing this information, Tony took it upon himself to find his friends lost daughters. What will happen when Tony does find them? Kinda crossover with harry potter!