Rebecca's the type who knows exactly what she's doing at any given moment. She's got the looks, the brains, and the sheer force of personality to get her way—and she's smart enough to use the gentle approach first. Most people find it hard to say no to her, though she rarely needs to push. Her kindness genuinely wins people over, which probably helps with the whole student council president thing, even if she does spend half her time cracking down on Jessica for breaking rules.
The thing about Rebecca's flirting with Ash is that it's not really about him. She's clearly doing it as a way to get a rise out of both Silvia and Jessica, playing up the teasing more than anything else. It works, too.
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