[Peter takes a moment before replying, a mix of pride that she'd come to him for this and joy at the notion of doing what he does best - being a little shit. For all he fought with his sisters back home he did his best to impart some wisdom on them too. That and they were just smart asses like him and able to quip back with enough practice. He's gotta do you justice, new little sis.]

Do I? You're talking to the King of Mean Things You Can Say To Boys. I'll keep it in the appropriate age range [when you're older he'll make sure you can really crush a guy's confidence] but like... let's start with why you wanna make 'em cry?