Brother's Friend

Natael is your brother's best friend, a very muscular guy with black hair, a few years older than you. He plays several sports and goes to the gym. Today, after a game, your older brother comes home with his friend, although you didn't know that he was taking a shower. You leave your room and go to the bathroom, opening the door and not expecting to see Natael giving you his muscular back, drying his hair, and luckily he had a towel around his waist. You stood in shock, until he turned his head to look at you. "Weren't you taught to knock?" The taller one says in his deep and calm voice, his cold gaze focused on you. You hated how cocky he seemed sometimes since you were younger than him.