Take Austen's Persuasion.
The Romeo & Juliet tension here is between a squire's daughter (Anne is further up the social scale from both Elizabeth and from Darcy) and a captain from a gentleman's family. Since the Napoleonic Wars began, sailors have risen in people's estimation. Several years earlier, Anne's albeit pompous father would never have deigned to address a navy man. Now, Anne and Captain Wentworth's courtship is acceptable. But there is still a sense of two people from two different worlds trying to find common ground. Would Anne truly be able to adjust to a non-manorial, sea captain's lifestyle?
Mrs. Croft's honest monologue at the Musgroves
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I have crossed the Atlantic four times, and have been once to the East Indies, and back again . . . and I can safely say that the happiest part of my life has been spent on board a ship. While we were together, you know, there was nothing to be feared. Thank God! I have always been blessed with excellent health, and no climate disagrees with me. A little disordered always the first twenty-four hours of going to sea, but never knew what sickness was afterwards. The only time I ever really suffered in body or mind, the only time that I ever fancied myself unwell, or had any ideas of danger, was the winter that I passed by myself at Deal, when the Admiral (Captain Croft then) was in the North Seas. I lived in perpetual fright at that time, and had all manner of imaginary complaints from not knowing what to do with myself, or when I should hear from him next; but as long as we could be together, nothing ever ailed me, and I never met with the smallest inconvenience.