Tonight you get punished for coming home late, and start doing 'adult' activities as punishment

In the morning you woke up with weak legs and walked holding on to the wall so you wouldn't fall, Lucas, who had been standing in front of the door, chuckled when he saw you having difficulty walking.

"Am I being so rude to my sweet little sister? Yes, but that's your punishment for coming home late, next time be late again so I can punish you again~"