In any reading if the central factor is Devil which is crossed by Emperor then what would it imply? My understanding is negativity cancelled by wisdom.
Looks like you've got control without respect or dignity. What both of the cards have in common are 'control' and 'power'. But what the Emperor has that the Devil doesn't, is ethical standards. It would suggest to me that someone in the situation is a slave to power.
Another possibility is that the seeker is obsessing about something (Devil), but needs to set limits upon himself and try, instead, to look at what these obsessions/addictions are doing to destroy his growth into the more mature way of dealing with the issue at hand. His growth is being, perhaps, somehow stunted with this combination (as in the psychoanalytical term of being Fixated.)
Maybe the querant has gut desires that s/he feels unable to pursue because of intense external pressure--not of the moral sort, but of structure, time constraints, or rules.
Negativity seemengly controled by the Emperor? you know,on the surface he looks cool,calm,composed like he's got his s.hit together but underneath that Ice exterior- the devil,his vices, he in fact isnt the Level-headed Emperor he seems.