What happened between Gatsby and Daisy, when Nick left them?

Nick leaves the couple alone for a few minutes. When he returns, they seem luminously happy, as though they have just concluded an embrace. There are tears of happiness on Daisy's cheeks.

They make their way over to Gatsby's mansion, of which Gatsby proceeds to give them a carefully rehearsed tour. Gatsby shows Daisy newspaper clippings detailing his exploits. She is overwhelmed by them, and by the opulence of his possessions. When he shows her his vast collection of imported shirts, she begins to weep tears of joy. Nick wonders whether Gatsby is disappointed with Daisy; it seems that he has concieved of her as a goddess, and ­ though Daisy is alluring, she cannot possibly live up to so grandiose an ideal.