It was the fourth of July, 1998. My girlfriend and I went to the lake to watch the fireworks from the shore. We were sitting up in a lifeguard tower to get a better view above the crowd. The entire night we had been messing around with each other and soon enough my girlfriend put her hands down my pants and started rubbing my dick. At this point we were both so worked up that stopping wasn't an option. She told me she wanted me to fuck her and make her cum at the exact time the fireworks went off. She pulled her jeans and panties down to her ankles and sat on top of me with her back facing me, and a blanket pulled over her lap. We went slow for about ten minutes but as soon as the fireworks went off she started to ride me like she never had before. We both came instantly with about 500 people looking on, I guess the fireworks weren't the big show that night!