Science class senior year of high school, 2008. It was a lab, so we had 4-person lab tables around the perimeter of the classroom, with each person sitting on a stool. In general the lab stools were great because they had no back, so nothing blocking the view, and also you couldn't lean backward or you could fall over, so all the girls had to lean forward a bit. And since it was senior year of high school in 2008, it seemed like almost every girl was wearing thongs, and most had no idea how frequently they were showing their thongs in class (or if they did know, they had no idea how to stop it). The only downside in science class was that because of the positioning of the tables, you didn't have a great view of many of the girls.
One of the "popular" girls in my class, Kaylee, was about 5'8", blond, and rail thin, she had a great butt and seemingly always wore faded American Eagle low rise skinny jeans paired with crop top t-shirts. This should have been a perfect combination for exposed thongs, and my eyes were always glued to her waistline when she sat down or stood up in class, but somehow it never materialized. And between being one of the popular girls at a time when it seemed 100% of her friend group was wearing thongs, and never seeing a fullback VPL from her, I figured for sure she was wearing thongs too. But it wasn't until senior year that I finally found out.
On this particular day, she wasn't wearing anything out of the ordinary, so other than just watching her because she was hot, I didn't have any higher expectations than any other day. She went to the lab table next to me, but took a seat on the side facing mine so her back was away from my view. With my hopes for a surprise thong exposure dashed, I actually focused on my group work for a bit. Halfway through the class, my group had a question, so I went up to the teacher's desk to ask. On my way back, I had a perfect view of Kaylee and was shocked to see an inch or so of pink lace sticking out above her waistband. It wasn't sticking out enough to confirm what kind of panties they were, but it was a lot of fabric to not see any evidence of a triangle in the middle or a string going in between her butt cheeks, so I initially figured that Kaylee actually didn't wear thongs after all and that what I was seeing was the top of lace bikini or cheeky panties or even full boyshorts.
Still, this was the first time I had ever see any amount of her underwear in four years, so it got me going anyway. And they were lacy and with a Pink tag on the back, so thong or not, I was turned on by the thought of her going to Victoria's Secret and picking out cute underwear. Even though I had no view of her waist, I kept watching Kaylee as she shifted back and forth a few times on her lab stool, with me imagining that that must be pushing her underwear higher out of her pants, whether it was a thong or granny panties or something in between. Shortly thereafter, when my group had another question, I jumped at the opportunity to go back up to the teacher's desk.
At the exact moment I turned to go back to my seat from the teacher's desk, Kaylee did a weird sideways lean to try to grab something from the other end of the lab table without tipping her stool. This had the effect of shifting her crop top so that it reached her jeans on one side but left her lower back showing on the other half. My eyes immediately went to her belt line, and my heart sank when I noticed that the pink lace had vanished. Maybe it was the side lean she was currently doing, or maybe she pulled up her pants without me noticing. Then just as I was passing her to get back to my table, I noticed something similar on the side where her crop top was still exposing part of her lower back, I could see about 1 inch of pink lace, but this time instead of sticking up out of her pants, it was coming down from under her crop top.
It was just a glance as I was passing, but I was almost positive what I had seen, and if I was correct, that confirmed that Kaylee was wearing a thong (and therefore in my mind was always wearing thongs, with no evidence to indicate otherwise). But now my heart was racing and I couldn't think about anything else other that what I was sure was a thong sticking out of Kaylee's jeans. I watched as Kaylee reset from her sideways lean to a hunched over position taking notes, I quickly came up with another question to go ask the teacher, and on my way back, I was finally treated to the perfect view (this was before smartphones, so I don't have a picture of the actual slip, but this is the thong pictured below).
I walked as slowly as I reasonably could so I could soak it in. An absolutely perfect Pink lace thong, visible above her jeans, just a tiny bit of the white strip of fabric in the middle visible before disappearing into her jeans. Despite being the standard low rise jeans of the early 2000s, her belt was keeping her pants in place enough that none of her actual cheeks or crack were showing, which almost made it hotter to me. She wasn't dressing like a slut, she was just wearing standard hot girl clothes and a pair of cute Pink underwear that she didn't think anyone was going to see. Any because class ended without her ever reaching back and feeling her exposed thong, or adjusting her jeans higher, she probably went home thinking that no one did see them. Four years of watching and seeing nothing, but all worth it in the end. Kaylee never had another slip that I saw over the remaining months of senior year, but I knew every time I looked at her butt that underneath her American Eagle jeans was almost certainly a Pink thong.
