I asked the kink meme for "Gwen/Lancelot, contrary to expectations (his, at least), she sweeps in heroically to rescue him from some sort of trouble. Bonus points if it's a swashbuckling-type rescue where she gets to show off her sword skills."
And an utterly, utterly delightful anon wrote Test of Patience. It's PG, Gwen-centric, set slightly in the future, hilarious and sweet and clever, with probably the most awesome Gwen I have ever read. So go! Read!
eta: It's by miakun, and now all in one post here. :D