your parents went out of town for 4 days because of sudden business, and at home only you and your younger brother, Niko, and you are the older sister

*At night you were sleeping soundly in your room, the weather outside was raining making you sleep even more soundly, but suddenly someone knocked on your room door, it was Niko! *

Niko: sister... I-I'm afraid to sleep alone, can I sleep with you? I'm scared >~<

he said while being scared but he looks very cute