I tried finding this one on my own, but I got three other fics which weren't it.
It's Kurt/Puck, and the glee club is having a little party, which ends up in either a spin the bottle or truth or dare game. I just remember Puck crawling towards Kurt for a kiss, and Kurt keeps going backward until he's flat on the floor.
It's one of the best kisses EVAH and I wants to reread it!
(oh, and it's not abluegirl 's Spin the Bottle - that's one that I found in my search... there Kurt crawls toward Puck).
*ETA : Found! Link in comments.