Sis caught masturbating in the shower, kept it from parents, and received assistance in ejaculation

My step sister was in the shower and I caught her jerking off. I didn\'t tell my parents, but I helped her reach a massive orgasm. She\'s a total whore and a slut, but her tight pussy is worth the trouble. My wife is always down to watch me fuck my step sister, and she loves it when I double my load on that tight cunt.