Crossing white eyed Drosophila with sepia eye
I posted this on Reddit as well, so credit to km1116 for working this out. Here is his response which follows my original logic (though I'm not sure if he is right):


  female x male:
  
  w x se
  
  F1: wild-type females and white males
  
  F2: 1/4 white-eyed males, 3/16 wild-type males, 1/16 sepia males, 1/4
  white-eyed females, 3/16 wild-type females, 1/16 sepia females
  
  se x w
  
  F1: all wild-type offspring
  
  F2: 1/4 white-eyed males, 3/16 wild-type males, 1/16 sepia males; 3/8
  wild-type females, 1/8 sepia females
  
  wt x dp (either direction)
  
  F1: all wild-type
  
  F2: 3/4 wild-type, 1/4 dumpy


My rationale for his answer is the genotype of the cross looks like this:

XwYNN with XWXW nn , where "W" is normal eyes, "w" is white", N is Wildtype and n is sepia.