The link to the fan-fic is HERE
https://docs.google.com/document/d/14lgUY7yfbooT5IT6miNNbPqSY_qLA9aiVMjsEpszePk/edit?hl=en#

The alternate ending is HERE
http://www.fanfiction.net/s/7107696/1/MLPFiM_The_Dark_Side