The Last Article by Harry Turtledove - a short story showing the immediate aftermath of the German conquest of India from the British.
It’s not particularly realistic in terms of the scale of the German conquest; the backstory mentions a successful German invasion of Britain, the total German victory over the USSR, and all of that proceeding the mentioned successful invasion of India. But I think that it’s realistic in the sense of showing the inherent cruelty and violence at the heart of Nazi ideology.
The story features Gandhi and Nehru, in the immediate aftermath of the German victory, attempting to use non-violent protest and civil resistance to get the Germans to leave India. Far too late, Gandhi learns that this tactic only has a chance of working if the targeted authorities behind unjust laws or an unjust regime also have a conscious that can be reached, and if the unjust regime itself shows restraint in dealing with peaceful protesters.