"You can't leave," I exclaimed, "You're the best thing about this place."
"Thank you, that is really sweet," Cathy replied leaning against the shoulder press machine I was sat at.
Cathy must have been in her mid 20's, only about 5" 2' tall, with a slim body and, although hard to tell with the slightly baggy polo tops the staff had to wear, had a pert looking pair of breasts. She had an attractive, oval-shaped face but it was her chirpy, friendly nature which made her even more of a turn-on, along with the fact she often used to wear tight fitting leggings which, coupled with her narrow waist, really emphasized what a sexy, round backside she had.
She'd just told me that she was leaving the Health Club as she was now a fully trained sports physiotherapist and masseuse but there was hardly any call for those services here and so she was taking a job at a specialist clinic.
"Well, I've only just got here but you've already ruined my work-out," I continued.
"Sorry," she replied, with a sort-of 'please forgive me look on her face'.
"I'm really going miss you around here but...," I paused for a moment wondering if I was about to over-step the 'mark' but then continued, "...I guess I can tell you now that you're leaving that when-ever you used to wear a certain pair of leggings around here it was very, umm......off-putting."
"Really?" she said half quizzically but her smile indicating she'd probably guessed what I was getting at.
"Why's that then?" she seemingly teased, tilting her head slightly.
"Well, as a 41 year-old, married man, I probably shouldn't say this to a young, 20-year-old-something, but you must have the sexiest-looking arse I've ever seen."
She was now staring straight at me, slightly grinning, but obviously wasn't going to 'help' me by saying anything, so I continued; "and when you wear those tight leggings it...." I paused,"....often used to cause me a....problem."
She grinned broadly.
"Not sure if I should really say, 'sorry'," she laughed, "but I'm actually going to say 'thanks' as I'm really very flattered."
"Good, I didn't want to offend you, it's meant as a compliment."
"Offend me!?" she did seem genuinely surprised at my comment. "What? That, a good-looking, athletic, mature man finds my backside attractive...!"
"Well, not just your backside...far from it actually..." I corrected her.
We looked straight at each other again for a few moments, neither saying anything and me unsure if I was just imagining the sexual tension.
Cathy's eyes then dropped down and I suddenly became aware of the clear outline of my prick jutting upwards through my shorts.
Realizing it was too late to try to cover my erection I just sat there, waiting to see her reaction and was so relieved when I saw a definite grin appear once more on her face.
As she then looked back up at me, still grinning, I moved my hands up round onto my lap.
Cathy then leant in towards me, lightly touching my knee as she said, "Maybe I should give you a leaving present...wait there," before walking away.
I wasn't sure if I was imagining it, but I could have sworn she was provocatively wiggling her bum as she walked towards a door marked, 'Staff Only'.
I just sat there for a while considering what she could have meant and then, half-heartedly, continued with my exercise until I saw her walk back into the main gym, a broad smile now on her face.
As she headed towards me I realized she now had 'those' leggings on and I smiled and slightly nodded my head to her as if in appreciation.
Cathy stopped at the machine about 5-6 feet in front of me and for a few moments we again just stared directly at each other.
She then slowly turned round and, keeping her legs together, bent over, appearing to anyone else who might have been watching that she was fiddling low down with the seat of that machine. The outline of a thong was clearly visible and she very, very slowly, started wiggling that cute arse of hers, first side to side, then up and down.
Her backside was indeed the sexiest I think I've ever seen and this view of it made my now rock-solid cock jerk in excitement. I would have given literally anything at that point to be sliding in and out of her from behind whilst firmly groping those round, perfect-looking bum cheeks and I let out a throaty, frustrated sigh at the thought.
Fortunately, at this time in the morning, there were only a couple of other people in the large gym so no-one would have been aware of my massive erection now thrusting upwards or of Cathy, having looked around, spreading her legs and then running her hands slowly all around her bum cheeks.
