I Like To Expose My Buttcrack

I was wearing a pink t shirt were it finishes on my waistband so If I bend down you can see half my back, and loose jeans, And when I stand up I made sure that some panties and bum were exposed, And when we arrived at the cinema I sat down half way on the seat, like I still have space to go back, and slide back and I could feel my jeans and panties going down and like 3/4 of my bum was exposed, and my panties were also exposed a little like 1 inch or something, and I was sitting between my two other female friends, than I bend forward to arrange my shoes, and one of the girls saw my bum and undies were exposed, and poked my other friend to look and they giggled, then one of them "dropped" her mobile on the seat in front of us and told me to get it, and I knew what they were up to so I played along, and I stood up and leaned over the seat to grab it, and they both laughed, there were couple of people behind us and also saw my bum, than when I got back I saw my friends laughing and I asked why they are laughing and one of them said "because half of your bum was exposed and everyone could see it", and I pretended that I was embarrassed and said sorry and pulled my jeans a little up and they said that it was fine, after the film, we went in a mall, And when I was walking, I pulled my jeans up, but left about 2 inches of bum exposed, and I pulled also my panties up, so my panties was also exposed, And it was a busy place so everyone touches each other to go through and there was this boy I think he's about 15 or something and he kept going into me like his hand on my panties, sometimes his groin touches my bum, than I decided to play with him so I just bend down really quickly and he crashed into me, like his hands on my bum, and his groin part on my bum, He was really embarrassed