Wally did not know how it happened but somehow he had kind of, sort of unofficially adopted Supergirl as a little sister. It was not his fault he felt this way, he was there from the beginning for her, saw the first time she opened her eyes, saw how sad she looked when Superman rejected her, she came home with him. (Even thought it was the only logical solution it's not they could say. "Supergirl now that we made it together through all kinds of danger to make it outside of the Cadmus building were sending you to stay the weekend with Aqualad to stay in Atlantis! CONGRADUALTIONS! Oh, no wait you need oxygen to survive! Well okay then you can go with Bat- (-BATGLARE-) err...Flash you can go with Flash.) So Supergirl would spend the weekend with the Flash Family.

Having Supergirl come home with him was...interesting because she was so new to everything, sure she knew what stuff was because it was implanted in her brain but to actually feel and see it all was a whole new experience for her. Wally couldn't help but watch as she moved around his house taking everything in with pure wonder and joy written on her face no matter how hard she tried to hide it. When Iris had asked what exactly had happened to the kids to make them look like they had been run over by a truck.

So then Supergirl decide to make her feel better telling her that, no they had not been run over by a truck. " Oh no Ms. Allen don't worry we weren't run over by a truck, we had a building fall on top of us." Of course this did not make Iris feel better.

The weekend came to an end rather quickly if you asked Supergirl and Wally, but if you asked Robin or Aqualad it felt like it took forever.

When they became an official team and Supergirl was moved into the cave, Wally had mixed emotions about that because he was ecstatic about being a team but would miss having Supergirl so close. ("Dude she was only at your house for one weekend." "Shut it Rob you just don't understand!" "…Whatever.") Not that he didn't think that she could take care of herself ("Ya cause she totally kicked your butt." "ROB JUST LEAVE!") he just felt better knowing that if he was nearby he could help her if she did need help.

He just felt very protective of her, she was just so new and innocent and the world was cruel and mean and someone had to look after her and the best person to do that in Wally's mind was Wally.