An ominous voice...

Yooouuu.

His gaze whipped upwards, eyes falling upon the figure standing there that wasn't before. The creature before him was... demonic. That was the perfect, and perhaps only, word to describe it. Utterly demonic.

Four jaggedly curved horns. Two whip-like tails. Wings like a massive gargoyle bat. Jagged plates covering its body that, while at first seeming to be armor, on closer inspection were in fact biological chitin. Hands that were more like jagged claw-talons. Feet vanishing into flickering red, purple, and black flames that melted the snow below it, making the creature bob up and down as if hovering. It easily stood at what must have been eight feet tall, dwarfing his own exceptional six foot nine, and was completely pitch black except for two glowing red embers for eyes upon its blank and featureless face.

Huuuuumaaaaaan...

The voice, if it could be called a voice, was hoarse, raspy, and sounded more like an ominous wind than an actual voice. It didn't even seem to be coming from the demonic figure, but rather, hanging in the air all around them, no true point of origin or true point of destination. An omnipresence.

Do you realize what you have done, foolish mortal?

It (he?) raised one jagged talon, pointing at the young man's chest. Specifically, his heart.

You have bonded with my heart! The wretched organ I, the Ruler of Hell itself, cast aside so I may obtain absolute power! MY heart is part of you now! It feeds on your being, and it has given me the despicable emotions I sought to be rid of!

He frantically looked down at his chest, seeing a hole seemingly burned into his jacket, through his shirt, and into his undershirt. But... no wound in the visible bare skin?

The creature stepped, no, glided forward a bit.

Do you have any idea how this feels? All these... feelings! Affection, sympathy, sadness, anger, and ... l-love! Horrid, disgusting love!

He raised his jagged talons to clutch at his head, as if nursing a migraine.

They are all flowing through me, like a filthy disease! I cannot take it anymore! I, the Demon King, have for the first time in centuries, come to the realm of the mortals for one purpose... To hunt. You. Down!

He glided forward a bit more. The young man swallowed hard.

And now that I have you right where I want you...

He glided a bit closer. The young man felt like he might piss his pants!

I just have one thing to say, you pathetic human!