42-year-old Sarah had taken a loo stop after arriving at the long-distance bus station at about 6 am. She had access to the staff lavatory (due to the fact she was travelling as a guest of the driver), which at 6 in the morning was basically empty, aside from the odd driver coming in to use the kitchen area to heat up their breakfast.
The staff toilet was in a separate closed off area - 2 secure cubicles with ceiling to floor lockable doors on them, so it was very private and discreet.
She went inside but within a minute or so, had texted her friend (the driver) to join her, so long as the "coast was clear".
The driver joined her inside and saw her sitting up on the ledge above the toilet with her legs resting on the closed toilet seat.
She admitted to him that noticing the twin mobility bars attached to the wall each side of the toilet gave her a very exciting idea, which she wanted to "share".
Intrigued and wanting to know more, he could tell by the look in Sarah's eye and tone in her voice that the idea was very well founded and potentially VERY thrilling for both of them.
Dressed in a pretty knee-high skirt and semi-heeled shoes, Sarah sensually lifted her right leg and placed it on the right-hand mobility bar, giving the driver a plentiful view of her well-formed, soft inner thigh and more than just a passing glimpse of the triangular shape of her knickers, which the driver could see were obviously white or off-white.
Sarah beckoned him to come closer to place his left hand on her right knee and slowly start caressing it along the inner part of her thigh. He also bent down towards her knees and began gently kissing her along the same part of her leg. As she got the wonderful flush of this feeling, she instinctively then placed her left leg up on the left-hand mobility bar and hiked her skirt even higher at the same time.
This second movement effectively spread her lovely legs, giving the driver a full view of the soft creaminess of both her thighs and even better, the tender white knickers spread tightly across her feminine triangle.
The driver's heart was instantly racing and his cock bulged inside his trousers as she spread herself in front of him. Now having access to the inner surface of both her thighs, he continued gently kissing and running his tongue along the softness of her flesh.
As he looked directly between her legs, he could see that even though Sarah's privates were still well covered, the crotch panel of her panties was obviously discoloured from the outside which gave him a very strong sense that they were likely even more stained on the inside.
All the while, they were keeping an ear out for possible intruders -- not that they would feasibly have come directly into the cubicle - but should the activity start to generate any noise of a sexual nature, they both felt as though they still didn't want to be detected by anyone entering to use the cubicle immediately next to them.
As the driver moved deeper between Sarah's legs and closer to that sacred, stained gusset that he now had a point-blank view of, he suddenly notice the muskiness of her odour. He found it hard to know exactly what was in the mix as he caught a decent whiff of it but he certainly hoped it was a potent cocktail of sweat, pee and discharge.
He ran his tongue closer and closer to Sarah's panty-covered pudendum and inhaled a few more times -- it was not in the least bit off-putting as he savoured her very special feminine odour -- strong, musky and oh-so-spicy, as he looked up at her lovingly only moments before her "invitation" was delivered.
"Do you want lick me across my undies??" Sarah offered to him directly.
"Of course I do!!" was the driver's seamless reply.
With a coy but knowing smile on her face, Sarah opened her legs even further and tilted her aromatic centrepiece towards his willing face.
Extending his tongue, the driver started gently licking length wise along the soft crotch pad of Sarah's knickers exactly where he knew her beautiful, smelly vagina and pubic hair were lying underneath.
Sarah started to breathlessly coo as the driver's tongue made contact with her private areas through the softness of her knickers as he loosened his pants and began stroking his cock.
Her musky odour was now unmistakable as his tongue ran along the soft material.
Sitting on top of the toilet with her legs wide open like this and allowing him to see her knickers uncensored, Sarah knew that only a tiny strip of cotton lay between her fundamental toilet openings and the driver's hungry nose and mouth.
He now felt so close to Sarah's pee and poo, not to mention her other essential female functions that she so often attended to in this intimate toilet setting.
The driver began imagining Sarah sitting in front of him peeing, pooing and maybe even changing her pad or tampon if she happened to be on her period or for any other reason that she used these exclusively feminine products, all the while sniffing her feminine aroma at such close range.
He noticed that the outside of her knickers was starting to get a wet stain across it - mostly from his tongue - but mixed in with the already darker staining it was looking distinctly dirty and less and less ladylike -- or maybe more so, if this is what ladies normally secrete between their legs?!
At this point, Sarah let him know that she needed to go to the toilet.
He accepted and allowed her to move down off the ledge and lift the toilet seat, sliding her knickers down and sitting her bare bum down on the white plastic seat.
"Come and have a good look inside my undies if you want!" Sarah said with a lovely, gentle grin on her face.
With her skirt hiked and those white knickers down around her open knees, the driver moved down between her legs as Sarah faced her crotch panel out towards him.
"There you go!" she said, "Now you can see what my lady holes have done to my knickers!"
They did indeed look very stained -- brown and yellow in equal amounts right across the deepest part of her crotch panel, very much in the shape of her vagina.
"Sniff it if you like -- Mmmmmmmmmm...that's it! I want you to find out what my smelly cunt is really like. I'm such a shy girl keeping these private secrets inside my panties all the time -- I only get to find out myself when I go to the toilet, so it is very rare to share them with another person. I know you love finding out my secrets like this!" her commentary continued.
"Wow Sarah!" the driver marvelled, "I love seeing how stained the inside of your undies are. It looks like mostly pee and discharge!"
"You're so tuned in to what goes on between a woman's legs!" she complimented, "I love how you know so much about my pee and discharge. I bet it's the colour that gives it away -- it's always yellow and brown for pee and discharge. Brown for other things as well but you seem to know very well!"