Glad to hear it.
Try thigh squeezing masturbation and see if you can edge, which is unlikely, but it feels good anyway.
Then look out if the window, every red car you see you have to secretly pinch or rub your nipples. Best done by pretending to scratch or folding your arms over them.
At every rest stop you’re to go and rub and fuck yourself for three minutes. And finally try stuffing your panties inside you for one leg of the journey.
Enjoy!