We were on a road trip about 4 hr drive away. My gf and I sat in the back and her mom and grandma in the front. About an hour into the trip I got very horny and my girlfriend could tell. She told her mom she was going to have a sleep with her head on my lap when in actuality, she took my cock out and started to lick and suck it. It felt great and she edged me several times all the while, trying to stay quiet. Her mom turned around to see if I was sleeping, to see a look in my eyes that told her I had just cum in her daughter’s mouth. She faced forwards and never said anything but I think she knew. After swallowing my load, and putting my dick away, my gf did actually fall asleep on my lap…