Cain and Abel with Heaven's Dual

In DxD, we now know that the souls of Adam and Eve are tied to two swords, but my point is that their sons

When they broke the ban and came for the apple, Samael was cursed and the two were sealed with a sword so where do their sons come from?

My guess is that Cain and Abel were the first to possess Heaven's Dual and they had one of the swords.

In the end, the Cain killed his brother

So, do you think it is possible?