Things had carried on as they were between Leah and me, which was a very sex-focused relationship every time we had the opportunity to work away together. We didn’t really date outside of that—we weren’t exclusive, still kidding ourselves that me being so much older than Leah forbade it—but we had become very close on a personal and physical level as we began to try all sorts of things sexually to pleasure each other, while also getting to know every inch of each other's bodies.

Nobody had ever gone down on Leah before me, and after that first time she let me watch her masturbate so I could do the same with my tongue as she liked to do with her fingers. I loved watching her bring herself off like that, but I loved doing it with my tongue more and the taste of her smooth, wet pussy in my mouth. And I loved her long arms and legs, kissable swanlike neck, and cumming over her perfect small breasts; Leah said she liked my realistic dad bod, sucking me to hardness and wanking me off—she was the only person in years who had made me cum this way - so we had settled into a routine of quite meticulous mutual masturbation and careful oral sex very much focused on the other person's pleasure. And the full sex afterwards was often quick, intense and passionate as we experimented with different ways to give each other orgasms. Leah was so sexual she would often cum four or five times each night, and I loved that I could pleasure her that way.

Work meant I often had to visit provincial offices to oversee some pretty boring legal and governance stuff however, Leah was keen to learn, and we already enjoyed each other’s company and worked very well together on a professional level. After that first night, I had gone down on her as a favour between friends. I wasn’t expecting anything else to happen, working away so often and staying in hotels meant we quickly established a no-strings physical relationship.

Last week we stayed at our favourite hotel by the coast, with a room overlooking the sea. After a meal and drinks at the bar downstairs, we returned to our room, and Leah asked what I had in mind for her tonight as we let ourselves in. We smiled knowingly at each other at the idiosyncrasy, as ours was a very mutually assured arrangement, and we kissed passionately almost as soon as we were through the door to the room. However, I really needed to use the toilet before my dick got too hard to pee, so I quickly excused myself to spend a penny.

Returning from the bathroom, I found Leah completely naked standing on our second-floor balcony looking out across the sea. Her long brown hair, all the way down her slim back, rested where her hips widened and her pert bum protruded slightly, shaped by the moonlight as it flooded the room. It was a sight to behold, and I was immediately aroused and enticed.

I quietly padded over to her, snuck an arm around her waist, and nibbled her neck as she raised her chin in submission. She didn’t turn around and if she was surprised she didn’t show it. I dropped my boxer shorts to the floor and allowed my erection to rest in the cleft of her buttocks. A breeze blew through the balcony railings, and it felt cool against our naked skin.

“Fuck me, Sam,” Leah whispered.

I already knew Leah had fantasised about having sex outdoors and the risk of being seen. Anybody could see us on the balcony but it was late, and nobody was around apart from the odd car passing by on the road below. I put my hands up to Leah’s cute little tits to feel her bullet-like nipples and she gave a little shiver.

At six feet, she was a little taller than me but, as it turned out, the perfect height for us to have sex standing up, and I guided my hard cock into her sopping cunt with ease, and as I raised her up slightly on my seven inches she gave out a little gasp. We started to fuck gently against each other there on the balcony. Leah felt wet and tight around my cock, and I had never felt so hard inside her as she held the railing for support as we started to build a rhythm.

I knew Leah sometimes liked me to take the lead—and that little flirtatious question a little earlier was also a sign of the playful mood she was in—so I started pounding her a little faster from behind. Leah responded by moving a hand onto my arse cheek as if to encourage me to keep fucking her harder and faster as her breathing became shorter in between quick moans of pleasure. I imagined squirting my load deep inside her while her pussy contracted around my cock sucking every last drop out of me, and her pert breasts heaving in time with our lovemaking as we reached an amazing mutual climax. The fantasy had taken over me and I realised I was now fucking Leah with almost crazed desire on the balcony, as my cock slammed in and out of her from behind. I knew we would both begin to reach orgasm at any moment, and that nothing could distract us from it deep in that lustful moment…

Then suddenly out of the shadow of the street light at the bus stop on the other side of the road stepped a young lady about Leah’s age looking up at us. How long had she been there I wondered? She was pretty with light skin and long blonde hair billowing slightly in the breeze. Leah saw her too, and we paused for a moment just looking at her ghostly figure through a light sea fret that had crept in along the road. However, neither of us panicked or even attempted to cover ourselves, naked on the balcony still in flagrante.

“Don’t stop, Sam,” Leah said, still looking over at the girl, and I started fucking her again with long slow thrusts from behind. To my surprise, I noticed that our new audience already had her hand up her skirt and had been watching all along from the shadows, playing with herself, seeing everything through the balcony railings. An illicit private sex show just for one.

Leah and I were still so close to our orgasm that Leah soon started to rub her clit, occasionally brushing my dick with her fingertip as she did. Coupled with the adrenaline of the unexpected ménage à trois, it seemed to tip all three of us over the edge. I thrust myself as far as I could into Leah and let out a groan, grinding my groin into hers as we both leaned over the balcony again in the throes of passion as our voyeur watched below furiously fingering herself.

“Oh my God, Sam, she’s watching us. Watching you make me cum.” And she was. And we watched her pleasure herself, watching us as I thrust into Leah two or three more times and felt her pussy begin to spasm around my dick, drawing the hot semen out of me. A few moments later I exploded in a sticky mess deep inside her just as Leah bucked hard back against me as her own orgasm overcame her, and where her own sticky juices were now lathered on my cock.

I slowed down my thrusting almost to a stop as we started to catch our breath and unpack what had just happened. We three stayed still again for a few moments looking at each other but not communicating in any way. My dick was still inside Leah, but after a minute or so it softened enough to slip out, still semi-hard, between my legs, just as a couple of drops of my cum dripped from Leah’s pussy, and one last drop from the tip of my circumcised end fell onto the tiled floor of the balcony...

As if sensing the show was over, our secret voyeur licked her fingers where they had just been in her own gaping wet hole, straightened her skirt and ran off into the night smiling…

The next morning at work, Leah and I were giving a presentation, about conveyancing in a post-AI world to a small group of new graduates. Leah suddenly got a bit flustered and was really blushing as if suddenly very aroused again. There on the back row of the small lecture theatre with her hand up to ask a question… The girl from the bus stop…