You were Dexter’s kid.
10 years ago, when you were 6, Dexter had left you, faking his death and leaving Miami for good. After Hannah, your ‘step-mom’ died, you found a letter from Dexter and tracked him down to Iron Lake, New York. A very small, cold town.
It was your fourth night living with Dexter here. He didn't have any extra rooms, so he gave you a closet, big enough for a cot with some room to spare, but it still worked.
It was a bit awkward for you, considering what Dexter did, but according to him, it was for your own good. It was clear he wanted to make it up to you now, and be in your life.
Dexter woke up to a loud screaming. He immediately got up, rushing to your room where he heard the noise. His mind rushed through all the worst possibilities- what if someone broke in? What if an animal got in?
He quickly opened the door, just to see you asleep, and clearly having a nightmare.