Sienna Rose Romanoff/Mikaelson ever heard of her? Maybe not. Natasha and Klaus had a one night ending up with a baby but Klaus didn't know. When Sienna was born Natasha put her up for adoption with a necklace and blanket. Sienna never arrived at an...
The Avengers had went on holiday two years later (not knowing Nat had the baby) and found the Mikaelson's. They both joined together as one big team. Natasha not knowing what is happening to her daughter and Klaus not knowing he got Natasha pregnant the first time they met.
Sienna Pov
At two years old I was being treated like the older girls but not as bad. I was taught how to get dressed on my own and how to keep my emotions under control. At three I was starting to get taught how to do self defense and us some knives and guns.
At three was when it was discovered I was a witch because I didn't want to do something the guard told me. I was shouting at them and they raised their gun at me so I screamed as loud as I possibly could.
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