Scorpius and Rose haven't been in touch for two years, until Rose finds a special mirror while looking for some papers. I realize my summaries are always like one sentence long, but I honestly can't think of anything else to say.
Vaguely follows the plot of Romeo and Juliet. Scorpius and Rose meet at a masquerade ball at the Ministry and, despite their parents warnings fall in love. This can't end well.
I, Rose Weasley, am sick. There's no other possible explanation for it. Rose's cousins come up with a plan to make her realize the true cause of her strange feelings.
This is very similar to my Enchanted Parchment story. Rose, Scorpius and Albus pass notes during History of Magic, and make confessions wouldn't make if not under the influence of magic.