This happened a few years ago in Sussex, England. Can't say where because I'd hate for the people involved to be recognised.
A friend of mine owns a vintage bus. Previously owned by a local company, it is an open topped double decker that he absolutely fawns over and he always keeps it in pristine condition, attending as many bus rallies and gatherings as he can with it. As I worked in the industry as well he often invites me along to act as his conductor, answering questions about his vehicle and, if he took it out to carry passengers, make sure they were safe. The days usually involve riding around on his bus and then sitting in a field full of buses, old and new, from around the country.
This particular rally was well attended, with about 40 buses lined up around a field. The sun was shining on the gathered throngs, mainly gentlemen of a certain age looking over the vehicles, taking photos and chatting about "back in the day" journeys they remembered on the buses.
After looking through the stalls and at some of the vehicles in attendance, it was time for us to go out offering rides between the site and the nearest station, situated a few miles away. I assumed my normal role, answering questions from curious enthusiasts about the vehicle, or about timings of the journeys, etc. After a couple of hours it was time for us to rejoin the field. I was looking forward to a quiet Sunday afternoon spent upstairs on the bus in the sunshine whilst my friend went off with his other enthusiast friends, trying to blag a drive of their vehicles as he always did! I was looking forward to a relaxing afternoon as we reversed into our parking space.
"Oh, is that it?" came a voice from upstairs as my friend killed the engine.
I hadn't checked the top deck, just assumed everyone had got off as was usually the case.
I climbed the stairs and stuck my head over the rail.
"Yes, sorry. I should have said".
I looked down the top deck and saw a couple standing at the back of the bus as if to get off. Mid 40's, he was a stereotypical bus enthusiast wearing black shorts, sandals a "British Leyland" T-shirt and a baseball cap with a local bus operator name on the front.
His partner clearly did not share his transport enthusiasm, rather tagging along to keep him happy. Again, mid forties, with long bright red-dyed hair, piercing blue eyes and one of those faces that always looks like she is smiling. I couldn't help sneaking a glance at her from behind my sun glasses, running my eyes down her body. Her hair was tied back in a pony tail, her v-neck top and heart necklace pointing to the top of her cleavage just visible at the "v" of her top. Her chest ballooned below this, very ample breasts stretching the material of her top before tapering back into her waist which, despite a few extra pounds, would not look unacceptable on a woman half her age. Hips tapering into her thighs, but being lost in the flow of her long summer skirt.
"That's a shame", she said. "I was hoping I had another trip to top up my tan and eat lunch."
She laughed along with her partner.
"Oh, well, if you only want a tan then feel free" I said. "I don't mind if you stay up here. It's not like we're going anywhere."
"That's very nice of you, thank you. Are we alright to eat our lunch on here as well?" asked her companion.
I knew my friend wouldn't mind and, having seen the site already, I had no intention of leaving the bus so they wouldn't be alone.
"Fine". I said ducking back down the stairs.
My friend said his goodbyes and arranged a time to meet back at the bus and, as he wandered off across the field towards the many stalls, I drew the bolts on the door so I wouldn't be disturbed. There were information cards in the windows, they must read those if the enthusiasts wanted to know more. A dead iPhone confirmed that it would be a very quiet afternoon so I grabbed the sandwiches I had brought for lunch and headed for the top deck intending to make the most of the summer sun.
"Mind if I join you?" I asked as I reached the top of the stairs.
"No, feel free" came the response.
I sat down and started eating my lunch. As we chatted, I discovered that Richard and his partner Angela (or Rich and Anj for short) were on holiday, visiting from a small town in Norfolk. As I suspected, Richard was the bus enthusiast and Angela his long suffering partner!
After discussing the vehicles in attendance with Richard, my conversation turned to Angela. She worked in a bank and had been with Richard for about 3 years after a failed marriage. I was struck by how sweet she was - her smile always present and her blue eyes sparkled behind her glasses. She was easy to talk to, very cheeky and perhaps rather flirty. As conversation turned back to RIchard, she finished her lunch and stretched, her arms reaching for the sky pulling her top up slightly. I couldn't help watching as it rode up almost to her navel revealing the creamy smooth skin of her lower belly. I was struck by the contrast of her skin colour between her stomach and shoulders which had been exposed to the sun. She looked like she was in danger of getting badly sunburned.
"Ouch! That looks sore Anj" I said. "You look like you've caught the sun quite badly".
She looked down at her shoulders and pulled the top of her shirt down, exposing more of her cleavage. I couldn't help but stare at her chest as more of the pale skin on top of her breasts came into view.
"Hmm? Oh, that's not good," she said. "Look, Rich, I've got a tan line."
She turned slightly to Richard, her hands hooked over the neckline of her V-neck pulling the top down exposing more cleavage. I could feel my cock stirring as she exposed more of her large chest.
"It looks painful," I said.
She feigned indignance and haughtily pulled her top back up again. "You shouldn't be looking!" she exclaimed with a wink
"Well, no point me suggesting to sunbathe topless to even out your tan then!" I retorted.
Richard and Anj laughed.
"Oi, cheeky!" she retorted. "Do you say that to all the girls who get on your bus?"
"Only the ones with something worth tanning", I replied.
Conversation turned back to the buses around us. It was very secluded, the field being large and not overlooked. All the buses in our row were closed single deckers and we felt like lords of the realm sitting atop our open decker in the sunshine.