This is the only Leon/Yuffie story I've EVER read an it was AMAZING.
Such perfect freaking VOICE, perfect word usage, perfectperfectperfect.  I adored the Cloud Mambo, because, fuck, finally someone ACKNOWLEDGES Clouds freak out moments.  And instead of playing up the emotard that Cloud has become, finally finally finally all his freaky-deaky-ness managed to shine through -- and he wasn't even a main character.  
And ho shit, a moseying smile is classic Cloud.  
But I loved Vincent's.... knowing.  Just the way Yuffie knew he knew everything, the way she quoted "..."
dedness.