Nicely done, but not entirely orginal.
I don't know whether you've realized it or not, but your flash actually re-tells a 1700's French version of the Red Little Riding Hood instead of the Grimms' version.
Of course, there are at least 16 different versions of RLRH as far as I know. And usually the earlier the versions, the more violent and "mature" it gets.
A few key points from the French version were nicely illustrated in your flash, such as how the girl "drank the blood and ate the flesh" of her grandmother and how she "took the road of pines instead of the road of needles."
However, you seemed to have left out the "strip-tease" part of the girl prior to the eating (which happened in the orginal tale), and instead replaced it with the somewhat perverted uncle to add the humor. XD
Anyways, a very high-qualitied flash overall. =)