My problem step-son

My college age step-son is forever horny. today i’m heading off to have lunch with his friend’s mother and he’s catching a ride with me. as we’re driving along i notice he’s got a hard-on; again!! i tell him to get rid of it as we’re close to where we’re going. he tells me he can’t; he’s turned on. i pull over so he can get his cock out and wank. he still hasn’t cum and i’m running out of time (and patience). in exasperation i remove my sexy red panties and give them to him to wrap around his cock; that should do the trick. eventually he cums; into my panties!! what am i going to wear now? i’ll have to go to lunch with no panties on….. dirty bastard!!