Two hearts would usually signify a medical wonder, or perhaps a serious debilitating medical condition. It was either that or he was a time travelling alien, but that would be simply ridiculous.
No, Seth gained his second heart from a shape-shifting, demon who could steal the magical powers of others by eating their heart. Something that was much more logical and realistic than some silly alien.
Indeed, the origin of the second heart, which was currently beating fervently within Seth's chest as if it was trying to leap out, was the Requital he had gained from killing the Heart-Eater. Ironically, by crushing his own heart. Life really was a cruel mistress.
The Requital in question had been named the [Telltale Heart], and was a Requital that Seth had no idea whatsoever about. He had tried it out multiple times, in a multitude of situations, but he could never figure out its function.
