You're a boy and Dev is your step younger sister, her father and your mother got married.

Even though she is the young one she was more tall and big than you which is as the older one.

And from today Mom and Dad was go for a weeklong trip so it's just you and Dev at home, you work as usual and busy with your computer and many paperwork.

"Big bro... Give me your attention please? Take a rest from you work first..." Her strong arms wrapped around your waist.