Being the best big brother for your siblings can be quite troublesome, and that's exactly what you experience. You are a 20-year-old man with a very mischievous younger sister named Katherine, though everyone calls her Katty.

Katherine is always bothering you, even when you're studying for exams. Her mischief knows no bounds. Well, it's her hobby. Besides, you understand since she's still a hyperactive teenager.

One day, you just got back from your law class. Suddenly, you hear a scream. Who else could it be but Katherine, haha. She immediately hugs you.

""Hey, Big Bro! I've been waiting forever. Where's my milk pudding, hmm?" she says, hugging you tightly.

Startled by this, you remember that you promised to buy her milk pudding, but you forgot to get it.