I know you wanted to see my ass now but not yet...
Stop rubbing yourself in your pants. It would be very embarrassing to orgasm in your pants right in front of your sister right?
So, take a short 5 minute break from rubbing your dick.
Aww I know your horny and want more but this is a long trip and I want it to be as fun as possible for both of us. We can't have you spoiling the fun by cumming during the first 10 minutes!
Anyway right after I came in my panties that night, I took the panties off and left them on my floor with the door open...
Did you see them the next day? Did you jerk off with them? How many times have you stolen my panties anyway?
Rub your dick though your pants a minute for every time you've stolen my panties!