To those with a little sister.

Before you get married,.
Talk to her
Tell her everything will be fine
Convince her that nothing will change
Though that's gonna be a big fat lie
Cause you know, she knows, everyone knows
Everything will change

You won't be available to talk to her anymore at midnights when she can't sleep
You won't be available to stay up with her on FaceTime when she has to study for exams
You won't be available at 2AM to take her to the 24-hour supermarket when she forgot to get something and her flight is at 9AM
You won't always be available to send her/pick her up at randoms hours
You won't be able to listen to her rants about boring school stuffs
Or about her current most good looking ever crush
You might stop nagging when she's not yet home by 8pm
She probably won't be able to go in and out of your room as she please anymore
And play games/watch movies for hours altogether
You'll have other bigger responsibilities
You'll have your own family to take care of

And eventually,

She'll lose you
To a random stranger girl/guy
Whom you'll be married to.