If the Third Indo-Paki War starts and goes atomic, I expect each side to use two A-bombs. At that point each side will recoil and ask for a suspension of hostilities. After prolonged negotiations, the war government of each will be replaced by a peace government and a truce will be signed. The side that went atomic first will have to pay some reparations.
The horror may have a benefit. The Iranians and the Arab states with A-bombs may see the non-benefit of this type of war and stick with the sponsorship of terror groups, rather than trying atomics.