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 ]

Brian woke up and staggered groggily to the bathroom mirror, with is eyes mostly closed. He stood in mute stupor for a while, staring at the mirror, until his brain finally connected with his eyes, and he began seeing properly in the waking world. 
 Heaving a weary sigh, he began to brush his teeth, kick starting the routine to begin another day. 
 After finishing in the bathroom, he searched around for his shirt and pants, and found them rumpled at the foot of the bed. Grumbling about wrinkled clothes, but with no time to find something better, Brian hurriedly struggled into yesterday's outfit. He slipped into his shoes and headed downstairs. 
 
 Brian could see the bright young sun peeking in through the many windows of the house, and it gave his spirit a lift. Walking a little taller and looking up at the high windows that lined the upper level of the house, he reached for the handle of the front door, anticipating that good feeling of stepping into the crisp cool air of a lovely late spring morning. As he descended the short steps leading to the door, lost in his good morning thoughts, he nearly tripped and fell. Gingerly, he stepped over the still form of the youngest daughter that belonged to the family who lived here before stepping into the bright promise of a new day.
