Twilight: “Hey! I saw you like to play book jenga, want to play with me?”  
F!Starlight: “But aren’t you a little old to play?”  
Twilight: “Filly please, I still make book forts!”  
F!Starlight: “Let’s play!:D”  
Starlight (offscreen and outside): “Wait!? Twilight was Princess Bookhorse all this time!? I…I always thought she was just an imaginary friend I came up when Sunburst left.”  
Spike: “Hehehehe, Princess Bookhorse?”  
Starlight: “She loves books, a little too much. What else would I have called her?”  
Spike: “Oh, no, I’m just surprised the rest of us didn’t think of it first.”