Everybody is happy for Vice-principal Luna when she gets a wonderful new boyfriend—everyone, that is, except for her older and very overprotective sister, Celestia. She is not happy about it at all. In fact, she is so unhappy about it, she ropes Sunset Shimmer—who in turn, ropes Princess Twilight Sparkle—into breaking into the boyfriend's house and digging up any dirty secrets he might be hiding.

It would have gone smoothly, had Luna and her new beau not come home early. Now, stuck hiding in a bedroom closet, Sunset and Twilight can only watch and wait for the two of them to...tire out?