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When Leonard's relationship with a new woman starts moving too fast, he goes to Penny for advice.
Sheldon can barely contain his joy when Leonard starts dating a woman who meets Sheldon's exacting standards.
Christmas is a source of stress for Leonard - whose handsome colleague starts dating Penny - and his friends, who are being tormented by Sheldon's obsession with gift-giving etiquette.
Leonard and Penny's relationship takes a turn for the worse when they break up, but is quickly resolved. Soon their relationship progresses into a stronger friendship than before, while Sheldon and Penny's friendship slowly begins.