Write a story that seems normal on first sight , except for one small detail that makes it extremely creepy on a more careful reading [ WP ]

I loved to lay in bed at night and feel the gentle rise and fall of her chest. To see the quirky way she smiled as she dreamed. Sometimes I would sit for hours trying to decipher whatever it was she was saying in her sleep, hoping there might be some message for me. I knew she loved me. She always made me feel loved. 
 
 Then there were times when she would furrow her brow and look frustrated and even scared. I wondered if those were dreams of being chased. I'd lay my head against her chest and hear her heart pounding in those moments. I'd wonder what was chasing her, was it someone she knew, was it a wild animal, a dog even. The thought scared me too. 
 
 But I had her and that was all I needed for now. So night after night we'd have dinner together and she would tell me about her day. Then at the end, we'd settle into bed together and drift off to sleep. Except that she almost always fidgeted and woke me up. It was fine, though, I preferred it even. Because then I got to lay here and listen to her breath. 
 
 I wish I could love her like she does me, but I just ca n't. Especially not after how she acted toward the presents I gave her. I'd have my revenge for that. All I can think about now is laying there on her chest until she passes and I get to smell the sweet smell of that final breath and feel her chest fall for the last time. Someday, maybe someday soon.
