I saw it on AO3, I think it's a relative new fanfic, they used to know each other but apparently meet up while there is a case in Las Vegas. I think there is at least 10 chapters. In one of the few latest chapters, there's a whole chapter dedicated to a lemon scene about Spencer losing his virginity in Las Vegas and developing a praise kink before going back to D.C. I think the girl [Adaline] was going to move there.
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