Imagine: Derek picking you up from school.
"Hello, boys!"Derek boomed in a happy voice as he pulled up beside where Scott and Stiles were standing at the school.
"Aw, Derek, that's so nice of you to offer us a ride home but I can't abandon my jeep."Stiles smiled.
"Wait,"Scott said."why are you happy? You are never happy."
"Hey, Der Bear!"You called, rushing over to his car.
"What?!"Scott shouted."Him?!"
"Y/N, don't you dare get in that car."Stiles warned."Derek, don't you even think about driving away."
Stiles ran after the car as Derek sped away.
"THAT'S MY SISTER, SOURWOLF!!!"