Alone, Together by Failte200 is one of the grand masterpieces of Kim Possible fanfiction.note It is a highly-detailed and realistic (for Kim Possible) account of what it takes to develop an intimate relationship between the main character and one of her main opponents.The story begins as many do, with Kim and Shego fighting in one of Drakken's lairs. But things soon go awry as they accidentally activate his latest device, a dimensional portal that sends them to an alternate universe that looks normal until they discover that all the people have vanished. Over the course of the next twenty-one years, Kim teaches herself math to find a way back home, while Shego studies medicine to keep both of them alive in this strange new world. Over time, they fall in love.And that's just the first half.Where the story really gets interesting is when they come back from the alternate universe, restored to their original ages with no memory of the experience, to discover that they've been gone for thirteen days. They seem completely unaffected... until each of them experiences odd little shifts in behavior, skills they didn't know before and don't remember learning, and finally flashback memories of Other World experiences. As they realize the connection to the accident, they seek each other out to compare notes, begin re-establishing a friendship, and ultimately fall in love all over again.The story is notable for its intelligent and patient handling of the Kim/Shego pairing, taking the time to develop a believable romance between the two of them rather than going the "abandoned snow cabin" route from the get-go. It also features some very entertaining meditation on interdimensional travel that is based so heavily in real world science that it's difficult to tell where the two separate. It's sweet, funny, and absolutely heartrending in certain places, and above all it's a story that begs to be read.It can be found at Kim Possible Slash Haven and of course, fanfiction.net.
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