The math
Shudder
"I can do the math", he said, " and besides - no one else would know".
Abby squeezed her eyes shut, and shuddered.
"I did it for us, so that we could be together. Forever." She had no doubt he was smiling lovingly at her.
Abby opened her eyes - she was right, he was actually beaming - and shuddered once more.
She could do the math too - her best friend was her brother, he had just killed off each and everyone of their family and friends, and all this to be with her. Alone, on the accursed island.
She took a step back, feeling tears forming in her eyes. "But Henry, if you love me, you… you can't want this. What about me, don't you think I should have a choice? How could you think I would want everyone I know and love out of my life?"
The desperation were fast catching up on her, and she felt her lips tremble. Suddenly furious at her own weakness showing, she shouted: "Everyone is dead, you are insane!" Retreating further away from him, her tears flowing freely now, she looked for something, anything that she could use to hurt him.
By the kitchen sink she found a glass, and threw it at him, yelling: "It's incestuous!" Henry dodged, avoiding the glass. He looked calmly at her, and said: "I know it's incestuous, and it doesn't matter. I love you, Abby. We have all the time in the world now, and no one will ever bother us anymore."
Feeling her face crumble at the truth of his last statement, Abby shook her head. "No, no" she sobbed. She squeezed her eyes again, with a desperate wish for this being only an exceedingly hellish nightmare. How could a trusted, loved friend reveal himself to be such a monster?
Suddenly he was there, embracing her tight. "Oh Abby, it pains me to see you hurt", he whispered into her hair. "Everything will be alright, I'll protect you forever". She stiffened, thrusting her hands against his chest, trying to free herself from his embrace. He only held on tighter, nuzzling her hair, kissing her forehead. Abby couldn't get enough leverage to push him away. Instead she held her body completely still and stiff, not sinking into his arms. At the same time she felt sick and revolted, yet oddly comforted by his presence. "Habit's a bitch" she thought, "how many times has he comforted me like this before?".
He surprised her by picking her up, carrying her over to the couch, and putting her down in his lap. She tried to kick him while he carried her, but didn't manage to free herself from his grip. Trying to wriggle away from his lap only made him laugh. "I've got you, Abby, there's no getting away. Unless you are trying to turn me on by wriggling around?" He breathed the last sentence into her ear, and it pulled her up short. Now she really felt sick, and sat stock still, hoping to God that he hadn't turned completely demon. "What if he tried to… No, there had to be that much left of the Henry she knew, he couldn't possibly mean to do that to her. Then again, she would never had thought him a murderer and a serial killer either."
"Don't worry", he said into her hair, "I'll never hurt you. I can wait for you. But it's not like we haven't done this before, Abby. Don't you remember?"
Abby shuddered again. Revulsion thick in her throat, she remembered alright.