Public Exposure For Permission To Cum

I am an owned sub and my mistress is helping my explore my public and slutty side. After 2 weeks of edging and denial I was nude in my car masturbating for her like a good slut. She was going to deny me again but I was so horny I wanted to cum so badly. I begged and begged to cum and her response was get out bemd over the hood and fuck yourself hard. Im fully nude parked backed into parking spot on far end of strip mall, it is dusk and the shops closest to me are closed but there is a bar and pizza shop open on other side. Without thinking of where I was or how I was dressed I opened my door got out walked to the front of my car turned around, putting my ass to the shopping center, spread my legs and bent over like a desperate slut. Had to keep one hand in front of my talking to her as I reach my other hand under and fucked myself hard. I dont know if anyone saw me she made me look at my phone the whole time. She waited till she could hear other people talking through the phone before she told me to cum. She told me to be really loud as I orgasmed so hard she kept telling me to fuck myself harder as I was orgasming encouraging me to be louder and cum harder.