Looking for a panty-teasing/tickling story

[TeasingPrivates]

Hey all. Im looking for a story and wonder if anyone here can help me find it again. Can't remember the title, and I don't know if I found the story here on Literotica or on another site (like the Tickling Media Forum). The main theme involves a female customer in a clothing shop who is trying on some panties in a changing room; in fact, Im sure the title was something like "The Changing Room" or "The Fitting Room". A female salesperson is assisting the customer inside the changing room when she discovers a blemishing frayed thread (a loose string) has appeared on the panties. Pulling the string might make the matter worse so the assistant decides to snip the thread, with her teeth! This is amazingly HOT as the salesgirl spreads the woman's legs VERY wide in order to give her better access to the flawed panties. Then the girl tries repeatedly to bite the string off, but alas, she can't quite get the stubborn string. So she helps the woman spread her knees/legs to the max, permitting the best possible access. The salesgirl then proceeds to inadvertently tease and tickle the fuck out of that poor woman's pussy as she is determined to bite the string off. The scene drools with eroticism, heh. If anyone knows of the story or where it can be found, please do place a link in your reply. Thanks!