All characters are over the age of 18.
Fran gave a little shiver as a small gust of wind tickled her sensitive skin. She was naked in a school playground, bent over a set of monkey bars, her arms hanging down and her wrists tied to the bar below her with soft rope. She had still been wearing her soccer shorts when she stretched her arms and shoulders forward through the bars at her boyfriend's request, but not surprisingly, he had pulled them past her hips and down her legs before tying her ankles shoulder width apart.
It was well after dark in the playground and she was very exposed. Her B-cup breasts hung down below her as if being pulled by the weight of her erect nipples. Supported by one cool, steel bar under her chest and another at her hips, her nicely rounded bottom was bare. Her bare pussy was in plain view to anyone who might have walked by. What was surprising was that Mike, her boyfriend, was nowhere to be seen.
He'd picked up her t-shirt and shorts, called "See you later babe" and walked away leaving her bound, helpless and alone. She wasn't too worried though, even when she heard the car door close in the distance. They loved one another and would not do anything too cruel, but surrender, loss of control and testing their boundaries was a great source of sexual excitement in their lives.
He'd only been gone for a few minutes when she heard his footsteps on the gravel and turned her head to see him return. She asked about her clothes and he said he'd locked them in the car to keep them safe. Besides, he said, it was long after midnight and she wouldn't be needing them.
Smack! The peaceful silence of the playground was interrupted by the sound of his palm hitting her left cheek. "Ouch!" Fran squeaked. She knew that was coming but it was still a surprise when it happened so suddenly. One smack was followed by several more and pretty soon she was flexing her arms and legs, straining against the ropes securing her ankles and wrists as he smacked her bottom again and again.
Mike's spanks covered her ass up and down and side to side. It hurt and she pulled and twisted on the ropes but she was securely tied and there was no escaping her spanking. She wanted to cry out but knew she had to be quiet so no one would hear them. She felt an orgasm starting to build, helped by the pressure of the steel bar against her lower belly, but she wasn't ready for that yet. The night of outdoor fun was just getting started so Fran turned her face toward Mike and whispered "switch."
He stopped spanking, untied her, and helped her ease her naked body out from the bars. "Give me your shorts and t-shirt" she said, and in less than a minute she was dressed and he was naked except for his running shoes, his cock very stiff. "That's better" she said. "You're going to pay for leaving me tied and naked when you went to the car. Bend yourself through the bars now and be quick about it."
The switch game developed from Fran and Mike's shared interest in BDSM. They had met in an English 100 study group and soon started dating. She had seen 50 Shades in his bookshelf and, one day, after reading parts of it aloud to each other, she asked him for a spanking. He was happy to oblige, bent her over his knee, and the after spanking sex was fantastic.
After another couple of spankings Mike realized that he wanted to be spanked too so Fran reached for her hairbrush and turned his pale cheeks to bright red with his cock trapped between her muscular thighs. When he started to come she spanked harder and he spurted great gobs. They wanted to try bondage so they walked together to a hardware store to buy some soft rope, laughing as they touched several thicknesses on display, oblivious to the strange looks they were getting from the clerk who cut some lengths from the roll they selected.
They played bondage games together, starting as soon as they returned to Fran's apartment. Over the next few weeks they spanked each other with wrists tied in front, wrists tied behind, ankles tied to either side of the bed and legs tied together. They took turns with Mike's leather belt, one of Fran's heavy sandals, a wooden spoon from the kitchen and, of course, Fran's hairbrush.
Several times they laughed to see one or the other wince as they sat on the hard plastic seats in their university class the morning after a good spanking. They both liked spanking and being spanked, perhaps preferring be the one getting spanked and the centre of attention. They talked about having a safeword and decided on "switch" as not just a safeword but a role reversal. That's how Mike found himself naked and tied over a set of monkey bars with Fran standing nearby wearing his clothes.