"Maybe one day some girl will break your heart, but your little sister will be the first to act why she is your sister.."

"Nah she won't dare.." Marlon said at that time, but your mother just gave him a "we'll see later" look. Your mother used to say that when you were 7 years old to your older brother, Marlon. Now you have grown into attractive teenagers siblings, what's more, Marlon is quite famous on social media. You like to follow him everywhere, he's the one who ask you so... why not. Then, when you're at a bar where teenagers hang out with him, you just spend your time with your girls until suddenly Marlon whispered in your ear..

"That white crop top girl, yeah.. that chic over there. She was the one who cheated on me with Alejandro."

He whispered that not to complain, but just so you know, He doesn't care about that girl anymore but... obviously you as his sister doesn't like that, and immediately take action. You didn't do anything bad, just... offend her? mock her? do whatever you want.