Julia gently rubbed Amy’s well-spread cheeks as the thermometer registered, stopping occasionally to run her finger slowly up and down Amy’s excited moist lips. After about five minutes she used two fingers to separate Amy’s buttocks while she slowly and deliberately removed the thermometer, read it and placed it on a tissue. Keeping her two fingers in place she reached over, grabbed the yellow thermometer from the jar of cold cream and inserted it into Amy’s waiting bottom. Amy gasped from the cold sensation and raised her bottom to meet the invader.

Julia began to slowly withdraw the thermometer until only the bulb remained inserted, held it there for a moment, and then just as slowly re-inserted it into Amy’s waiting bottom. She continued to move the thermometer in and out, whispering into Amy’s ear that she wanted to get a reading representing the average depth of insertion. Amy had completely surrendered to Julia and could only softly moan as the thermometer repeatedly penetrated her.

Julia was becoming more and more excited herself and stopped briefly to shed her top and sweatpants before kneeling and bending over to lean her head down towards Amy’s upturned bottom. She reached under her belly and slipped a finger over her clitoris and into her well moistened slit. She had often locked herself in the bathroom at home and enjoyed long masturbating sessions with the rectal thermometer in the bathroom cabinet, so the idea of checking her own state of hotness came to her immediately. She retrieved the basal thermometer out of the jar of cold cream, slid it into her own waiting bottom and began working it back and forth with one hand while manipulating Amy’s thermometer with her other hand. When she whispered to Amy what she was doing, Amy responded by emitting a long soft groaning sound.

After about ten minutes, Julia removed Amy’s thermometer and her own thermometer, read them both, and collapsed next to Amy. They spooned together and fell asleep cuddling together.

When they awoke the next morning Amy was still surprised about what had happened the previous evening and although she was still excited by what had happened she could not look at Julia without blushing. Julia was sitting on the hassock in the bedroom and held up a well lubricated thermometer, patted her lap and told Amy to lay down across it so she could see how high Amy’s morning temperature would be. Amy complied and Julia reached between her legs to spread them open, placing a knee between them to widely separate them and raise Amy’s bottom. The thermometer slipped in effortlessly. This time Julia just held the exposed end of the thermometer between her fingers for five minutes before removing and reading it. Needless to say she could see that Amy’s sex had become very wet and she playfully inserted her index finger into Amy’s waiting opening while sliding her middle finger into Amy’s now lubricated bottom hole, and spent the next several minutes fingering the excited quivering girl suspended over her lap.

They both showered and dressed and went down to the kitchen to get a morning cup of coffee. It was then that they each confessed to the other that rectal temps, even the thought of rectal temps turned them both on. They both laughed when each discovered that the other made secret trips to the bathrooms and played with their parent’s thermometers to orgasm behind locked doors. When Julia got up to leave she kissed Amy on the lips causing Amy to feel a strange sensation stirring way deep inside her. They promised to try again to see how hot each of them could be in the near future.