The Sirens are working their way toward some kind of reformation, spending time with the Rainbooms to pick up some tips and tricks to 'friendship'. Though they sometimes fall back on their old roots, the sirens are still slowly getting the hang of this friendship business.
However, Sunset notices them acting strangely sometimes and wonders what could be behind it. With Pinkie's help, the entire group learns why Adagio doesn't like hugs.
Prepare yourself for mood whiplash. That's your only warning.