Entangled by The Illusive Badgerpony
Link - http://www.fimfiction.net/story/91466/1/entangled/spiiiiiderrrrrs

"Whist flying to Discord's cavern, Fluttershy finds herself trapped in a giant spiderweb..."

Music used: Spider-Man 3 soundtrack (2007) by Christopher Young
I own nothing in this video.