Princess Celestia has lived a long time, and knows a great many things. But some things are still new to her. Unfortunately, new things, no matter how pleasant, can sometimes have unexpected side effects. Effects that might worry her sister.
Despite the description, no alcohol is involved. Inspired by an etiquette article and the fact that the Princess has only been seen to partake of one kind of beverage in the entire series; it's about time she broadened her horizons a bit.
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