You are now imagining Shining Armor shouting "Cadance!" repeatedly.
Maybe an occasional "OH Cadance!!"
....Yeah okay, I'll shut up now.
One of my friends saw me drawing this, and said he didn't understand the joke.
The only way it could have been more obvious is if Cadance leant in and said, "Hey Twilight, I'm f**cking your big brother."
...But that would have been weird...
...I wonder what Twilight needed Cadance's help with?