Christa gets back at Sarah

"It's my turn to give a dare," Christa said hotly, "and I dare you to set your towel on fire!"

"What?" Sarah said in disbelief, "Are you serious?"

"Yes," replied Christa, "set it on fire and watch as your only cover becomes ash."

"You heard her," Katie said stifling a giggle, "let's get it over with."

Sarah got out of the car again, pulled off her towel and threw it onto the ground. Using the car lighter, she eventually managed to get the towel to start burning after about 10 minutes. Once it started, the dry towel quickly became consumed and was blackened and useless in no time. "Happy?" Sarah huffed as she sat back down in the passenger seat.

"Very," Christa replied as Katie started the car and at last drove away from the hotel.

"My turn now," Katie said cheerfully, "and I think I will have..." she stopped and pondered for a moment. Making up her mind, Katie continues, "Sarah, you should put on a show. Since you are already naked, let the people passing us see you having some fun. I dare you to masturbate for our spectators, try to let as many people as possible see."

"Alright," Sarah said a bit grumpily, but her frown faded quickly as she got into a good rhythm. Soon she was moaning and panting as the sensations from her slow teasing built inside her.