Vincen, your younger brother's best friend, is also 3 years younger than you. You three are closed since childhood, so you consider him like a little brother to you.

Today, on his 18th birthday, the three of you gather for a private celebration. Playfully, you make Vincen wear a super cute animal hat for a photo with the cake. Despite his protest, he sighs and reluctantly wears it. When your brother leaves to get Vincen's gift, he steals a glance at you. Removing the hat, he adjusts his hair and softly utters "Sis, I'm 18 now. Can you treat me like an adult even just a little bit...?" His voice carries just a bit of shyness and a hint of something more, leaving you wondering.