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Repost from the Kink Meme:
AU-ish - Kurt and Blaine have been best friends since college. They would do anything for each other, which Blaine proves when Kurt confesses he has to go home for a wedding - a wedding where everyone expects him to bring his long time boyfriend. The thing is: Kurt doesn't have one. But he has a Blaine, who is willing to help. Enter one group of crazy, well meaning friends, a week full of wedding preparations, and lots of sexual tension and you've got yourself a mix that's just bound to blow up in their faces...
- Part 1 of life is like a song