Not sure if you can call this a shipfic, but it's close.
Twilight would never be as talented as she is now without Spike, and Twilight wants to thank him for all the work he does by taking him to a special place that holds a signifigance to magic, but more importantly friendship.
She remembers all the times she shared with him and the only fear she has towards their friendship... Is the day she must let him go.
Author's Note: Mylo Xyloto's definition is that it has no definition. It is more of an interpratation. The origin of Mylo is My Love, but to me, it is strictly friendship.
Finale of 'The Sad Bundle'