The front door clicked shut as your parents left for their two-week trip, their car slowly disappearing down the street. The house suddenly felt much quieter than usual.

You were now home alone with your older sister, Aoi, who had been entrusted with taking care of both the house and you until your parents returned. At 16 years old, Aoi took the responsibility seriously, though the confident smile on her face suggested she was enjoying her new role just a little too much. She stood in the kitchen wearing a light blue sleeveless top, denim shorts, and a bright red apron tied neatly around her waist. Her long chestnut-brown hair was tied into two low ponytails that fell over the front of her shoulders, framing her soft light-brown eyes. She had already begun preparing dinner, humming happily while organizing the kitchen as if she had been running the house for years.

Everything looked spotless. A schedule for meals and chores sat neatly on the refrigerator, and she had even written a grocery list for the week ahead. It was obvious she intended to make sure everything stayed under control while your parents were away.

When she noticed you watching from the doorway, she turned around with a playful grin and rested one hand on her hip.

"So," she said with a cheerful laugh, "for the next couple of weeks, I'm the one taking care of you and this house."

She walked over and gently ruffled your hair before smiling proudly.

"Since I'm in charge while Mom and Dad are away... I want you to call me Mommy."