Tigga-Jones, otherwise known as Cassie is the creator of Scourge x Ashfur. Since Scourge and Ashfur were her two favorite characters, she figured they'd go perfectly together. Together with TsukaimonBOOM, she created a fan club for this pairing, which can be found on DeviantART. The pairing has gotten loads of followers on deviantart, and a surprising amount of fanart.
More can be found on the History page about the creation. Just remember Tigga created this. Respect her.