"What, was he putting together a team for me while they brought me back from the dead?" Shepard didn't like the idea of having her crew picked out for her, especially someone from Cerberus.

But judging from Kasumi's tone, she doesn't particularly care much for Cerberus, either. And that makes Shepard like her any more. "Did I ever help you with that favor?" Even if she wasn't making the promises, she likes to think that she'd do it anyway.