Masturbating my step-brother while he's alone and watching him cum

I've been harboring a secret desire for my step-brother's big cock for a while now. Today, I finally decided to act on it when he was alone. I sneaked into his room and started to pleasure myself, all the while eyeing his impressive member. He caught me in the act and was more than willing to help me out. He bent over and I got to work, stroking his massive dick and teasing my own clit. The anticipation was killing me, but I knew I wanted to feel him inside me. He slid his cock into my wet pussy and started to pound me hard. The pleasure was overwhelming, and before I knew it, I was cumming all over his big dick. He followed suit, covering my ass with his warm cum. It was the most satisfying experience of my life, and I hope it's the first of many such encounters.