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There's also a more passionated kiss between Luke and Leia, a brief moment of it can be seen in the original trailer. I don't know where that scene would be, it looked like an alternate version of Leia's kiss, but didn't work as well as the surprise kiss one.
If you look at the production stills on disc 4 , theres a shot of Luke REALLY snogging Leia (they're going for it!!!!) ultimate proof that the leia/sister idea wasn't cooked up until ROTJ