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Once upon a time, in a small town, lived a bright and curious girl named Sarah. She was just 12 years old and had an annoying yet loving brother named Tom who was four years older than her. Tom had recently discovered the internet and stumbled upon some websites discussing various training techniques for girls' private parts. Intrigued by this newfound knowledge, he decided to put it into practice with his sister Sarah.

As the days went by, Sarah began to notice that Tom was acting strangely around her. At first, she thought it was just a phase he was going through, but soon realized that his behavior had a method to it. One day, after school, as they were both at home alone, Tom approached her with a serious expression on his face and explained what he wanted to do. He told her about the training techniques he had researched and claimed that they would make her feel much better down there.

Sarah listened to her brother's words carefully, unsure about what was going on but also too scared not to trust him. She knew he had always looked out for her before, so maybe this time was no different. She nodded tentatively and agreed to go along with his plan.

The training began with simple exercises like lifting her skirt while standing up straight and spreading her legs wide apart. At first, Sarah felt self-conscious and embarrassed, but as Tom assured her that these were normal things for girls to do, she slowly became more comfortable with it. As the weeks went by, the exercises became more intense; she had to lift up her skirt higher and hold her arms above her head while arching her back dramatically. The whole time, Tom would watch her carefully, occasionally giving feedback or praise when he thought she was doing well.

During one particularly intense training session, Sarah's tiny nipples began to harden against her shirt as she struggled to maintain the poses Tom had instructed her on. He noticed this and decided that it was time for them to move on to the next level of training; focusing specifically on her nipples. From then on, every exercise required Sarah to stand with her hands behind her head and arch back even further as she showed off her hardened nipples while maintaining perfect posture. The sensations were overwhelming at first, but soon became part of the routine; each practice making her body more sensitive than before.

As the months passed, Sarah noticed that she was becoming more aware of herself and her body than ever before. She had become more confident and self-assured, no longer feeling embarrassed about exposing herself to her brother during training sessions. In fact, there were times when she even found herself enjoying the sensations he brought out in her; a revelation that both frightened and excited her at the same time.

The training had taken its toll on Sarah's young body, making her incredibly sensitive and responsive. Even the slightest touch now sent shivers down her spine as she stood tall and proud, showing off the results of all her hard work for her ever-observant brother Tom. And while he continued to push her further than she thought possible, deep down inside she knew that it was only because he cared about making her the best version of herself that he possibly could.

As the training progressed and Sarah's body continued to respond positively, Tom decided that it was time for a well-deserved break. The two of them spent a relaxing afternoon by the lake, swimming and laughing as they had done countless times before. As they lay on their beach towels in the warm sunshine, Sarah felt content knowing that she had someone like Tom looking out for her; someone who would always push her boundaries but never cross them. She couldn't wait until their next training session and wondered what new techniques he had in store for her this time around.

Sarah giggled as she felt the warm sun on her face and body. She looked over at Tom, now lying next to her, gazing contentedly at the sky. For a moment, they just enjoyed each other's company in silence before Sarah decided to break it with a question: "So, what will we be working on next?"

"Oh, you'll see," Tom grinned mischievously before putting his arm around her shoulders and pulling her closer. "But first, how about we go for a swim?" he suggested with an inviting tone, already starting to undo the buttons of his shirt.

With anticipation, Sarah nodded eagerly and began to remove her own shirt. As they both undressed, revealing their smooth young bodies in the sunlight, Tom led her towards the edge of the lake where they dove into the cool water together. Swimming side-by-side with her brother felt incredibly intimate; she could feel his hands caressing her shoulders and back as he pushed them through each stroke. It was both exhilarating and arousing, making her heart race faster with anticipation of what might come next.