When I was 13, I had this crush on a REALLY hot guy who was my brother's best friend. Well, it turns out that he didn't know a lot about sex as his school didn't have sex ed class, so my brother was teaching him about it. My brother knows I have the hots for his friend and thinks it's pathetic and takes every chance he gets to embarrass me in front of him. Well one day, my brother is teaching Eric (the guy's name) some things and he sees me walking by. He whispers something to Eric and asks me to come here. I come up not knowing what he wants, and he suddenly grabs at my skirt and pulls it off, then grabs me and pulls me across his knee and pulls my panties down. I was totally mortified! Then my brother just starts talking like his naked sister is the most normal thing in the world, pointing out things to Eric. Eric was shocked and embarrassed, but not as much as I was! He told my brother to let me go and said he was sick. I ran up to my room and cried for a while. Eric came by later and apologized for what happened, but I told him it wasn't his fault. My brother still teases me about Eric's "Show and Tell" class, though.