You're Troy's sister. You're mom told Troy to keep you safe so you are forced to follow him around. He bullies Dustin and you stick up for him.
"Troy! Shut the hell up!"
"What the fuck Y/n?"
"Leave them alone! You and I both know what Dustin can do is awesome! You're just too jealous to admit it!"
Dustin smiled and blushed.
"You're lucky she's here, or else you'd be in a much worse position"
Troy walks away and before you follow, you apologize and smile to the three boys.