Sarah had walked around the car to the driver's side, and Sierra pulled up her dress, showing her smooth crotch for a second before her clit suddenly erected hard, then grew larger than a clit could, the tip puffing up and sprouting out into a huge cock that Sarah quickly settled down onto, her own vee, somewhat concealed by her skirt, showing only a lightly haired mound that was being spread wide by Sierra's dick.
"You seem to be having fun today," said Susan to Sarah, as the the car pulled itself out of the parking spot and got underway. Sierra thrust up into Sarah's cunt lightly, while Sarah held onto the small handlebar that had replaced the steering wheel for balance.
"Yeah, it's a twofer today, my brother's birthday and my mom's 90th, so they are having a bit of a party before everyone leaves," replied Sarah. As she finished, Sierra thrust up hard and Sarah clamped down and gave her hips a twist, which drew a subdued "mmm" from the driver. Neither was in a particular hurry. "Who's next on the list?" Sarah asked.
