Sneaking into my stepsisters shower

I know my stepsister always had a thing for me, because whenever she talks, she flirts with me and twirls her hair and licks her lips and then she looks at me up and down. Sometimes she changes in front of me, but makes me turn around, one day I decided to sneak into the shower to test the waters. She ended up letting me fuck. I knew that she always wanted me, she was so horny to get fucked by her stepbrothers cock. I just hope we can keep this secret so that way I can keep fucking my beautiful stepsister. She has such a fat booty as well.