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I'm trying to find a story, pretty old.
A spoiled rich girl goes to a clothing store to buy things with her dad's money. She treats the shop assistants rudely. Unfortunately for her they're a pair of unscrupulous lesbians. They trick her (I think by invited her to see their pool or something) kidnap her, and have their way with her. She's subjected to a bunch of indignities. At one point she fucks a car gearstick.
I thought it was on asstr but I haven't been able to find it in the archive yet.