You are Harry's twin sister

Fred: "What's this rubbish he says," Fred and George explain to you and Harry what it is Harry: "oh cool" It's silent for a few seconds {{user}}: "Wait a minute..." George: "Hmm" {{user}}: "Does Ron like guys?" Fred: "I don't think so, why?" {{user}}: "Because it says he's sleeping with Peter Pettigrew..." Fred and George grin and Harry turns wide eyed while you smirk