Twilight Sparkle is one of a handful of unicorns selected by Canterlot's top sexology research institutes to 'field-test' a new spell they've developed. As she's pouring over the details, wondering why they'd pick a 19-year-old virgin to test a sex spell, Rarity shows up, and after hearing Twilight out decides to help her. Before long, the rest of the Mane Six learn of the situation, and decide to pitch in however they can.
WARNING: Contains futanari.
My first clopfic!