I think horselizard has a couple I would not term "happy" per se. You can also find some of roadstergal's stories on her site at http://www.roadstergal.info/misc/rd.htm that aren't "happy" although I can't tell you which specific ones right off the top of my head ...
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I don't have access to my bookmarks at the moment, or I'd have more.
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There are harrowing ones with happy endings though.
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