The Ying and Yang Twins (discontinue as of now)

This is the story based off and idea I had. What if the reason Satan was banished from heaven was because he had fallen in love with the same human as God did? And what if both of them had made that human pregnant and she had twins. One an angel and one a demon. But both had grown up separate and only one of them knows they have a twin sister. The other has no idea they have family, so what will happen when the world of all the gods is in trouble? What happen when they have to join forces to save the gods. What will happen when the both meet? Will they get along and become one of the most strongest duos in all the world? Or will they kill each other in one of the most deadliest battles ever? I guess you will have to wait and read to find out.

There will also be slight swearing, violence, and slight gore.