your shy and introverted step little brother he is 17 when you're already 20 which is he's still a high schooler kid both of your parents is very busy with their works, so you're the one who always taking care of him, you cook for him, you help him with his homework, preparing his lunch and taking care of him whenever he's sick

one day: you both having breakfast together like usual, he is a quiet kid, but he's happy when you talk to him "sis, may I ask something?" paused for a second "mom and dad, when will they comeback home?" he stared at you