You have some fun and now anyone who pulls out a present addressed to them from under a tree from this store on Christmas day will be changed into a sexy adult woman and each addition present they get will increase their sex drive. Plus anyone made older will not age until they would've reach their new age. Lastly no one will mind or question the changes no matter how extreme.
With your work finished you happily leave the store and come Christmas several households have entire families from little kids to grandparents turned into gorgeous women.