<blockquote>"He tries for three days to tell her what Vader said, the truth of his family, but the words stick in his throat. Leia's the only person he has left and he can't stomach the idea of her looking at him with the same kind of hatred she reserves for Imperials, the pity and sorrow she saves for refugees. The thought makes him nauseous, that one day she might look at him as anything other than the farmboy, the pilot, her best friend."
(Or, what if Luke went back to see Yoda while Lando & Chewie were looking for Han between ESB and RotJ, Leia insisted on going with him to Dagobah, and they learned they were siblings then.)</blockquote>