[Onlygirl]

My friend and I are both seniors in high school and her brother is one year younger and is a junior. Last week I was over her house hanging out. We were both sitting on the floor in her living room deciding what pictures to submit into our yearbook. I was wearing my new jeans that were kind of low in the back so I wore a belt and a long shirt to cover my butt.
Of course her brother comes downstairs to bother us. My friend thinks he has a crush on me since he is always teasing me but I don't think so. I just see it as annoying. We were just sitting there talking when all of a sudden my friend's brother lifted my shirt in the back and held it so tight that when I was trying to pull it out of his hands it would definetely rip.
He kept saying that my he could see my buttcrack and I said it can't be showing I am wearing a belt. He kept saying yes it is! I finally asked my friend to look and she said 2 inches of my crack was showing! I couldn't believe it and fought with her brother to put my shirt back down so it can cover my buttcrack.
Her brother kept yelling no! I'm not putting your shirt down because I enjoy staring at your crack since it is so sexy! I got so angry that I screamed at him and tried to push him away so he would let go of my shirt. My friend also tried to help me by trying to get my shirt out of his hands. At that very moment their dad comes home comes into the living room to see what was going on. He said to her brother "What are you doing to her?" "Leave her alone and pull down her shirt right now"! "You are embarrassing her"! Her brother immediately pulled down my shirt and before he went to his room their dad said he will talk to him later. I felt so embarrassed because my friend's dad saw my buttcrack due to her immature brother!
My friend's dad looked at me and right when he was going to ask if I was OK I ran outside to my friend's back porch and cried. Of course my friend's dad ran out after me to see if I was OK. When he came out he said "Oh my god your crying are you ok sweetheart"? I said no and told him I was so embarrassed about what his son did to me! I told me that no one has ever seen my buttcrack showing not even my own parents and I especially did not want my friend's dad seeing it!
He hugged me and said it was OK since everyone has a buttcrack and it was big deal that he saw it and he will forget about and so should I. As for my friend's brother he said the way he was acting was unacceptable and that he has to appolgize to me. Before he could say more my friend's brother came out and their dad left. He said he saw me crying and felt so bad for what he did and that he didn't realize he really embarrassed me. He said he was just having fun and it was just a joke. He gave me a hug and said he was sorry and I forgave him. The next time I came over he did the same thing except he just lifted my shirt in the back as he walked by but this time my buttcrack wasn't showing. He has the nerve to say to me it was shame my sexy crack wasn't showing when he lifted my shirt! What is his problem? Is there something wrong him? Or is he just immature? Do you think I shouldn't have cried? Advice is greatly appreciated! Sorry it's so long!