Tell her to get up and get naked and set in your lap.

From Create Your Own Story

You tell her to pull off your pants and underwear and then she sets on your lap you get horny and then you fucker in `the pussy and ass 3 times then your mom walks in and yells at you both, and groundead you and then you fuck your sister for four days to get back at mom for grounded you and then your sister gets pregnant from you filling hear with your cum.

You are:
Josh, age 18