Me and my girlfriend were on our way up north to go to Niagra Falls. Its a pretty long drive. I was driving and we were on the fast high way. It was very hot out so I had at least 4 bottles of water about half way there. Then the urge came to pee. I got worried knowing i have a VERY small bladder and i couldn't hold it for long. A sign passed that read 23 miles till the next rest stop.. I told my girlfriend how bad i had to go and she just told me to hold it. It wasn't like we could get off at an exit, it'd take us to another highway. I started to squeeze my 'nether regions' because the urge grew bigger. The worst thing was that i was still thirsty and thinking of water made my me wanna go more. My gf saw how bad i had to go so she reached over and held my crotch for me. I could tell she was getting horny. I felt her start to rub their but that only made me relax and let some out. SHe felt it and moved her hand. i told her sorry and she was only turning me on. SHe crossed her legs watching my everymover. The traffic slowled down suddenly and i jammed on the breaks making the bottom seat belt jam into my bladder. I moaned loudly. i knew i couldn't hold it much longer. I started bouncing up and down. I felt pain down there instead of just the need to go. I started sweating becuase i was getting embarrassed the way i was acting. Me and my gf never had sex before even though we did touch ALOT! She took my water and took a sip of it. slowly! It made a little more dribble out. Fuck it hurt. I didn't want to get an infection down there but i couldn't wet my pants eatier. the car in front of me stopped dead in its tracks making me stop short again. While my bladder was pressed against my bladder i peed. but as i flew back in my seat i managed to stop myslef. My knees started to shake i couldn't hold it for another minute. My face was bright red when i pulled over and didn't care if i wasn't supposed to. I grabbed one of the bottles and opened it i then hesitated and up did my pants and boxers exposing my very hard dick. My gf was staring at it. (She hasn't seen me b4 that.) Then i froze holding the bottle to my dick. I was so nervous about going infront of her i couldn't go at all. She knew and reached over. She slammed her hands down hard on my bladder and my piss busrted out. that did it. it came out uncontrolablely into the bottle. it started to get full. my girlfriend was trying to open another one but was strugglin. it got filled up all the way and i had to stop. i put it down still having to finish but i couldn't hold it. the rest spurtted out all over me and the wheel of the car. I moaned and came as it did. it felt sooo fuckking good. I even pumped up and down on myslef not caring my gf was still right there, watching everything. theres no feeling like going when you've held it in for so long.