Spike lives in a giant castle with the company of not one, but two mares. So, everything's just peachy, right? Ignoring how unhinged his castlemates can be in conjunction with how much magical power they happen to have... and sometimes abuse.
Twilight needs a date to the Gala after blurting out to a noble that she already had one. The captain of her personal guard, Flash Sentry, volunteers. Things get sappy yet entertaining from there.
Spike finds Twilight awake in the middle of the night, unable to sleep, worrying about her upcoming elevation to ruler of Equestria. As usual, he knows what to say to put her mind at ease.