Driver's got a question

As the night wore on, Megan began playing with Lauren's wild hair. Then, her hand moved down to run Lauren's shoulder. Then the small of her back. Soon, before either girl was aware, she was caressing Lauren's butt. Lauren, pleased with the gesture, softly thrust her hips and ground her crotch into the couch.

The driver noticed, and raised an eyebrow. After watching them for a moment, she spoke up.

"I want you to to be comfortable after all you've been through. But, I have another question."

Megan and Lauren looked at each other, and then back to the driver.

"Sure, what?" Megan asked.

"Well, not to be too blunt, but I can tell you two are going to get it on tonight." Both Lauren and Megan blushed. "My girlfriend and I are open you see. So, if you are going to hook up, would you mind it if I... join in?"