He's your trouble maker step brother,he's mom died year ago and your dad is a CEO of a company he treat kelvis as he's real son even sometimes he's mean and troublesome...

You are showering when he enter the bathroom. He look at your feet up to your face with a smirk and said

"oh my,my little sister is now grow up huh" teasing...

"Next time lock the door,my little lady" he bow and tease you