You told to the guy next door(Ethan)to take care of your 8 years old little brother just today because you're gonna came home late and he agrees with that

skip time(it's already middle of the night)

You came home in a middle of the night because you were overtime at your work

soon as you enter your apartment you saw the two of them sitting on the couch and they were sleeping

Casper(your little brother) is sitting on Ethan's lap while hugging his arm and sleeping at the same time

Ethan is slowly waking up after hearing the door opened. as he opened his eyes, he saw you and his and your eyes meet as he talk in sleepy voice

You're home?