Julia was still admiring Amy when Dan got up and started slowly walking towards the bathroom door. She was certain that she knew what he was going to do, and thought about it as she watched him leave the room. She loved to see him naked and watched him from behind until he disappeared through the bathroom door while she slowly caressed the small of Amy’s back, occasionally running the palm of her hand softly over one then the other of Amy’s perfectly rounded bottom cheeks, and gently adjusting the thermometer that peeked out from in between them.

As Dan later learned, in addition to liking guys, Julia sometimes enjoyed playing with women. It was something about the shapes of women's bodies, particularly the view from the rear. A back rub that turns into a butt rub, sometimes also incorporating her nurse games, was a specialty of hers.

Amy had been Julia’s friend since junior high school. Julia recalled a day when they were alone in Amy’s parents’ house. She remembered it well. It turns out that Amy remembered it too. This is what happened.

It was just after the summer that marked the end of their senior year in high school. They were excited claim the status of graduates, both having achieved their eighteenth birthdays prior to graduation. It was a dizzying feeling into that spring.

Amy had just been recovering from a cold. Amy knew that Julia had definitely seen and understood the black cylindrical thermometer case and jar of cold cream that her mother had left out on the dresser in her room because shea saw Julia glancing at the dresser, looking at her and then quickly averting her eyes. Amy felt strangely excited by Julia’s knowing look, but Julia said nothing to Amy at the time about the items left sitting out on the dresser.

A few days later, Amy’s parents went away for the weekend, and agreed that Julia could stay over with Amy. The girls settled on watching TV in Amy’s parents’ room because the big screen TV was there. They were sprawled out lying propped up on their elbows on Amy’s parents’ king size bed. During a commercial, Julia sat up and began rubbing Amy’s shoulders. She moved to her back, then again to her shoulders. Amy quickly became completely relaxed. Amy raised up to help as Julia lifted Amy’s short cotton tee-top and bunched it up around her shoulders

Eventually, Julia added Amy’s thighs, then buttocks, to the massage. Amy responded to Julia’s urging hands by spreading her legs ever further apart. Finally Julia grabbed a pillow and bunched it up; Amy willingly complied as Julia commanded “lift up” as she grasped and raised her hips, stuffing the pillow under them to raise her firm tight bottom.

Julia could see the outline of Amy’s body beneath her thin cotton sweat bottoms. Very slowly she began tracing one finger down between Amy’s firm cantaloupe buttocks, gradually going further and further down. From Amy’s reactions, Julia knew she was becoming aroused and wet.

Earlier, Julia had excused herself and used Amy’s parents’ master bath since it was close. After she finished, she wanted an aspirin, so she searched for one, eventually opening the floor-to-ceiling double-door built-in cabinet.

The opened doors revealed numerous shelves held towels and washcloths, as well as numerous ordinary bathroom items. A jar of cold cream caught her eye, and she recalled the one she had seen on Amy’s dresser a few days earlier. She removed the top and immediately saw the poke marks that she recognized as signs left from quite a few thermometers dipped to the bottom of the jar to prepare them for use. Not only her curiosity, but also her determination was totally engaged.

On the other side of the same shelf, she noticed four cylindrical thermometer cases, one of which she immediately recognized as the one that she had already seen. When she removed the top of the black case, she saw the upper end of a thermometer shaft topped by a small rounded purple globe. As she pulled the thermometer from the case, she saw the white background bearing in all capital letters, the pharmacy name, followed by the word “RECTAL.” At the other end was a stubby, rounded, almost pear shaped bulb. She shuddered as she imagined what Amy would look like with the round globe peeking out from between her firm bottom cheeks, as it surely had been a few days earlier. At this point, she was totally committed.

The next case was white and held a thermometer that had the word “ORAL” printed on its shaft. It had a bulb that was more elongated and slender than the first one. The third case on the shelf held an instrument with an elongated bulb that looked like the previous one, but was thicker, sort of like the first one. She noticed that the range of its scale was narrower than the other thermometers. Julia had heard of predicting ovulation using a basal temperature, and assumed that this was a basal thermometer.

The last case held a thermometer with a triangular top and printing including the word “RECTAL” on a yellow background. At this point, her imagination took over and she mused what the weekend might offer. She closed the cabinet door and returned to Amy lying on the bed, the pillow underneath her raised hips raising and separating her pert little bottom cheeks.

Julia resumed Amy’s massage, concentrating more and more on Amy’s buttocks and the crease between them. Amy’s hips began to slowly grind into the pillow urging them upwardly. Before long, Amy’s sweat bottoms found their way down to mid thigh, her widely spread legs making it difficult to lower them any further. Julia could see that her attention to Amy’s bottom had produced a subtle but glistening wetness between the small lips of Amy’s sex.

Pausing a moment from rubbing Amy’s shoulders, Julia lightly placed the back of her hand against the side of Amy’s neck. “You feel warm honey.” She leaned her head down to Amy’s ear and whispered “I think we’d better take your temperature.” She slowly ran her middle finger down Amy’s crack as she whispered “I saw a thermometer in your parents’ bathroom cabinet and I’m going to go get it so we can take your temperature right here.” Amy let out a soft groan. Julia’s finger accompanied her words and continued down, softly entering the wetness between her legs. “Lie still” Julia commanded as she jumped up from the bed and hurried into the bathroom.

Julia opened the cabinet and grabbed the jar of cold cream and the case that held the purple-topped thermometer. She paused for a moment and then grabbed the remaining three thermometer cases before hurrying back to Amy, still posed face down on her parents’ bed, her bare butt thrust up by the pillow under her hips. Julia opened the cold cream jar and poked the purple-topped thermometer down into it until the silver bulb touched the bottom of the jar. For good measure, she also opened the flat case and inserted the yellow rectal thermometer bulb first all the way into the jar followed by the basal thermometer.

“Let’s get you ready,” she said, pulling Amy’s sweat bottoms all of the way off leaving her wearing only her white knee socks below her waist. “Lift up” she said to Amy, grabbing another pillow and stuffing it under her upraised hips thrusting her shapely bottom higher up off of the bed. She positioned herself between Amy’s legs, her knees forcing them further apart and placed the jar of cold cream, its three thermometers standing up at attention, next to Amy’s thigh. She resumed Amy’s massage, concentrating on her thighs and buttocks. Amy’s head was buried in a pillow as Julia began to again run her middle finger slowly up and down Amy’s moist slit while she quietly reached over and pulled the purple-globe-topped thermometer out of the cold cream jar. Amy’s hips began to rise and fall in response to the attention her sex was getting. At the right moment, when Amy had thrust her behind slowly up to its highest point, Julia quickly but gently inserted the well-lubricated rectal thermometer into Amy’s rosebud until only about an inch and a half stuck out from between her cheeks. She held the purple-globed end firmly between her fingertips. Amy moaned loudly from the sudden cool invasion of her behind.

Julia continued to run her middle finger slowly up and down Amy’s wet slit while she held the thermometer in place with the tips of the thumb and forefinger of her other hand. After a few minutes, she began to manipulate the globe slowly between her fingers to alternately twirl and move the thermometer in and out. With renewed determination, Amy’s hips began to rise and fall in response to the combined sensations.

After at least ten minutes, Julia slowly removed the thermometer, inspected it and, with a few quick snaps of her wrist, shook down the mercury column. “Now that you have sufficiently warmed this up, we can get a first reading” she said as she slowly re-inserted the thermometer deeply into Amy’s now well-lubricated rosebud. “I think that we will need to verify the reading a few times just to make sure,” she said authoritatively, playfully patting Amy’s exposed butt. Amy only moaned.

Amy looked over and saw the other two thermometers standing straight up in the jar of cold cream. This sight, plus the sensations of the moving thermometer and of Julia’s finger slowing moving along her wet swollen lips, stopping now and again to gently circle her swollen clitoris, made her groan softly as she continued to grind her pubic bone into the pillows.