My stepsister replaced my sex doll with her pink pussy

My stepsister loves spying on me when I am fucking my Tantaly sex doll. While I was fucking my Tantaly sex doll, I exhausted the lube. When I went to get a new lube, my stepsister replaced my Tantaly sex doll with her pussy. After a while of fucking, I found out that I was fucking my stepsister. I wanted to stop, but I was so close to cumming, so I didn't.