Mark's thrill as your panties began to wear thin after the third or fourth hour sealed in your jeans. He might have still found it sexier, if he had been able to move a bit, and if you hadn't started sweating. You were working your waitress job, and running in and out of the hot kitchen and from table to table. One of your trucker customers made a lewd comment, and chivalrous Mark had to respond. You cameltoed your panties to make him shut up, and made a joke about someone in the diner being a ventriloquist.
Thinking about Mark wrapped around your privates was extremely erotic for you. Your juices started leaking, which Mark found exciting initially. By the end of the day, Mark was stained with sweat, vaginal leakage, and wet farts. You were exhausted, and Mark felt miserable. You had planned to take him off and wash him out in the sink, but Katie came over, and you and the girls went drinking.
It was around 3 AM when you staggered home with Biff. It wasn't his real name, Katie had just started calling him that because he was buff. Katie had gone off with Biff's buddy Tom, and you ended up with Biff. Knowing that you had Mark trapped between your thighs with Biff dancing against you was so erotic. Mark was seething as the stranger ground his crotch against you while you were dancing. Mark couldn't believe you'd hook up with such a guy. He was jerk.
You wished that you had changed Mark into a dildo or vibrator instead of panties. Still Biff would satisfy you and teach Mark a thing or two. You'd turn Mark back in the morning after washing him out.
Biff was rougher than you expected. What with the cosmopolitans, and the long day, the sex pretty much tuckered you out. You recalled Biff wearing your black panties on his head as he stripped out of his jeans. Mark had been horrified at the giant shirtless man who began slowly peeling him down your thighs. He was dirty and gross and Biff was putting him on his head. The long silky black hair was oily as it pressed inside Mark. Biff wasn't wearing underwear. The sex was good, and you slept well. Mark felt nauseous. He felt worse as Biff stood there with his cock dripping, and transferred the panties from his head to his crotch. Mark was still a girl's black panties, but he was now stretched around a smelly drunken jock's genitalia and his buns of steel ass. Biff pulled his jeans back on, finished dressing, and then he slipped out into the early dawn's light with his trophy secured under his jeans.
When you woke in the morning, Biff was gone, and so were your panties.