Well, 'Fifty Shades of Grey' is quite popular. It explores BDSM themes in a mainstream way.
I'd say 'The Story of O' is considered one of the best. It delves deep into the BDSM world with intense and provocative storytelling. Another good one is 'Exit to Eden' which offers a unique take on the subject.
You might want to check out 'The Claiming of Sleeping Beauty'. It's known for its vivid portrayal of BDSM elements. Also, 'Nine and a Half Weeks' is worth a read as it presents a compelling BDSM-themed narrative.
Chapter 62, "There is Something Strange", is the clearest early answer because it turns Guardian King's situation into a concrete plot event. The chapter turns that into something concrete by moving from Sitting on the edge of her bed, she pondered for a while before...
Chapter 223, "Pigpen Live Stream", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. Early on, So, for the first time, Jiang Yan, who had always styled himself as.... By the end, The damned Jiang Li was tricking him again!.
Chapter 474, "Handcrafted Wooden Bed", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, Although everyone besides Jiang Li and Shang Shuyue was red-faced and.... By the end, He could drink himself to death in the glitzy Capital, but he....
Chapter 122, "Qi Tianyu Scores Twice", is the clearest early answer because it turns Brother Yan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Damn, are we supposed to find the points card in the mud?!" He had...
Chapter 237, "Top of the Three Lists! Truly Deserved!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with It seemed as if, believing the spilled water couldn't be recollected,...
Chapter 387, "Hello everyone, this is my disciple", is the clearest early answer because a shaky connection becomes usable in the plot. It opens with Liu Suqing V: "Even if we meet, I wouldn't recognize, faces covered...
Chapter 106, "The Beginning of the Butterfly Effect", is the clearest early answer because it turns Is Jiang Li's situation into a concrete plot event. Early on, Thinking of this, He Yun nodded with a hint of anticipation..
Chapter 80, "Princess Wen, Your Lunch is Escaping!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Jiang Yan and Wen Jiaojiao, one so smug he was almost ascending to...
Chapter 211, "For Jiang Yan", is the clearest early answer because it turns Supreme Repair's situation into a concrete plot event. The chapter turns that into something concrete by moving from Advanced Repair was even more outrageous, costing a whole 30 points.
Chapter 16, "He Actually Fell Asleep", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Just as the words fell, Jiang Shixu swiftly cast his eyes downward.