Young stepsister loves anal masturbation

When my stepdad married a new lady, I got a hot teen stepsister. The thing I really like about her is that she always wears short shorts and her ass is big. One day I saw her playing with her butt plug. She shoved it in her ass and then out. She was doing it and I went inside the room with my cock in my hand. She loved to see my big cock and started sucking it. Once I was ready, she shoved it in her ass and asked me to fuck her like she is a slut.