Bruce Banner's Neices

Keelan and Artemis find their worlds tumbling down. Their parents were killed in a wrong place wrong time incident by some bank robbers. Now who will raise them but their uncle, Bruce Banner. Bruce Banner has no idea that his nieces even exist, but when the troublesome twins end up living with him and the avengers, he may just find the family he's been missing. But what happens when the twins turn out to be more than just human, in fact, everyone is out to get these girls, good and bad alike, they're a prize for any side. Will the avengers be able to keep their adopted daughters safe?