Marco's Heart

You find yourself in a bright white, circular room. It's nearly empty; too bare, almost clinically so. But the bareness of it means that what is visible here stands out:
A podium in the center, where a familiar figure sits, head buried in his hands. Three paths running from the podium to three different spots near the edges of the room - not corners; circles don't have corners - where three doors leading seemingly nowhere stand with no regard for their complete lack of structural support.
It doesn't take you long to figure out where you are, does it? You only have to decide where to start.

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I took care of a problem. Are you hungry?
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Marco bares his fangs. Though he's clearly in shock - and, frankly, quite hungry - he seems... disoriented, too.
"Get out. Get out of my... my head...?"
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[If Marco is not having any of this blood, Ambrose will help himself to some, lifting The Mother's corpse to drink from the wound in her neck]
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Marco reaches out, but doesn't take another step. There is the sound of a door opening and closing, and very suddenly, they are somewhere else: a small stone house, the floor stained with blood. The body in Ambrose's arms becomes more tangible, heavier, more real, as does the Father's, still on the floor.
As for Marco, he falls to his knees with a sob.
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[Licks a bit of the blood off his lips, cautiously moving towards Marco]
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Something about the way Marco asks makes him sound... lost, frankly. Not outraged. Not even angry.
"I-I did this. I did this to them. That's why they, they haunt..." He shakes his head. "T-They don't, they're not real. But... But I still..."
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Finally, looking marginally more clear-headed, he points to the door.
"... They were going to show you. What happened the night I was turned."
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You—killed them? The night you were turned?
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But I thought—don't you turn whoever you feed from?
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Well. What an—unfortunate turn of events.
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"Probably best that you found out this way. Spared you the... the melodrama. I suppose."
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Still rather dramatic. So what now?
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His eyes linger on his parents' bodies. His chest hurts.
... Then a thought comes to mind, and it doesn't feel as terrible as he expects it to, and in a moment of... something he's afraid to name, he offers:
"Would you like to kill another one?"
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[He stalks off in that direction, blade at the ready]