Finger her ass some more..

Carl was enjoying the sensation of his finger up Steffi's ass, and he started to push it in and pull it out ever so slightly.

"...Carl... that feels funny..." Steffi said almost upset.

"Trust me, this is only to loosen you up for the thermometer - I'm not hurting you am I?" Carl asked.

"No... it just feels... strange..." Steffi breathed heavily. Carl thought he could almost feel her bumping up to meet his finger as he pushed it in and out of her. It must have been his imagination.

Carl noticed her asshole had relaxed even more, and might even stand up to having another finger in it.