romione is just hermione discovering someone who loves to debate as much as she does and ron finally getting to utilize the love language granted to any child of a big family: bickering
The first time Hermione and Ron woke up together, all of a sudden, Fred wasn't dead, Harry wasn't suffering from terminal internal injuries, his mother wasn't struggling with the loss of her son, and her parents weren't lost halfway around the world. They were just two teenagers, laughing and daydreaming, almost feeling guilty for feeling so peaceful, being in each other's company.