Late to the thread, but thought I’d share the story of where my ”obsession” for thongs came from.
My earliest memory was when I was around 13 or 14, in the early 2000s. My mom was the catalyst for this fetish, and it's a memory that's stuck with me to this very day. This took place around Christmas, in the early 2000’s. It was our family's tradition to open one gift on Christmas Eve, and we were all gathered around the tree. My mom was sitting on the floor, enjoying a glass of wine and chatting with relatives. She was wearing a green Christmas sweater, dark low-rise jeans, and winter boots. But what caught my attention was the reflection in the glass door she was sitting in front of. Her sweater had ridden up, and her low-jeans had slid down, revealing her thong. It was a Victoria's Secret thong, pink with a red trim, and Hello Kitty-themed. I felt embarrassed, but also curiously intrigued. I'd never seen anything like it before. A few of the girls I went to school with had started to wear thongs around this time, but none had been as skimpy as what my mom was wearing. As the evening went on, my mom had a bit more wine, and more of her thong became exposed. I'm pretty sure my older cousin caught a glimpse of her "whale tail," as he started asking her to bend or reach over to "pick up some stuff." Despite feeling embarrassed, I was strangely turned on. This wasn't a one-time thing though. My mom would often "whale tail" in public settings, and it seemed like her thong was always on display. I guess that’s what sparked my thong “obsession”.