My little sister is always being a smartass and talking like she owns everything, so I decided she needed to be taken down a peg. She's 13 so she thinks she knows it all. Anyway, she's hanging out with me because my mom made me take her when she bitched about not having anything to do, so my friends and I are checking out some hot chicks. She starts going up to them and saying "My pervert brother says he wants to pop your cherry" and shit like that, so I walked up behind her and pulled her over my knee and pulled her shorts and panties down in front of everyone and just spanked her until my hand got tired. I noticed she was squirming and seemed to be staring at someone, then I saw a guy that seemed to be her age and put 2 and 2 together and figured out this must be a friend or her crush! I invited the guy over to take a look at her state of undress and she started sobbing uncontrollably. I held her in my lap while she tried to fight back until he saw all he wanted to see, then I let her down. "I'm telling Mom!" is all she said and ran home. When I got home I got it good, but my sister has been a LOT better behaved since then!