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Stark chuckled at her words, giving a little shrug. "Well, yeah. I like you, but I  tolerate Cap." Stark teased. He'd never say he disliked his sister (openly at least) but he couldn't hide who was his favorite sibling. The chocolate female was his equal, the yin to his yang. "None of that now." Stark countered, looking over at Banner and leveling her with a little twitch of a smile. 

"You're going to do a lot of good. You ARE good, even if you don't see it sometimes." the male had limitless faith in her, and no matter what happened he'd stand next to her and support her. "How about I go talk to her, bring her back here?" Especially if Banner was comfortable here then Stark wanted to offer her to stay relaxed and comfortable. It might help her more, and he was all about keeping her as calm as possible.