Rarity notices Spike spending less and less time with her and spending more and more time on his own, she was fine at first, but his frantic behavior begins to tip her off that he's not off on his own, he's off with somepony special, She Follows him around ponyville to discover just who is stealing his attention from her, The answer surprises her.
Vinyl Scratch notices her Octavia slowly playing less and less attention to her and spending more and more time out on her own, She was cool with it at the beginning, but her behavior and general anxiousness to leave at certain times tips her off that she's not off on he own, she's with somepony Special, she follows her around ponyville to discover who it is, the answer surprises her.
(was originally gonna post on Valentine's day but was delayed) (until 2 Valentine's day later it seems,)