large with that vulnerable feeling

The article provided seems to be a casual conversation about a specific drink order that has been placed at a bar. The customer requested a large drink with a "vulnerable feeling," which implies they were looking for a drinks that had a certain amount of sweetness and richness in the mouth, yet were also somewhat light and not overly heavy. The customer also noted that the drink should be prepared freshly for the patron, suggesting that the bar owner or brewer would need to pay close attention to the exact recipe and preparation of the drink. It is not clear to the bar staff whether the customers are referring to the flavor profile or the size of the drink, as both factors could influence the overall experience and taste of the beverage.