Secret Original Sisters

What if the Mikaelson family had two extra members? Their two younger sisters. Thyra and Eria Mikaelson were twin sisters. They were only a year older than Henrik, but after he had died, they were named the youngest. Klaus their brother had a reasonable reason as to why he dagered them. Those two were innocent to the core. They were loved by all, even Mikael their father had a weak spot for them. But now they were awake. They have been awoken to problems after problems. Let's see how fate will change now they are awake. With one named to be merciful other of thunder, how will these two change the lives and hearts of those around them?