I catch a whiff of my step-son's boxers while doing laundry. The smell is overwhelming and I can't help but touch myself while I sniff them. I was so turned on by the smell, I had to get more. I quietly go into his room and gently smell him through the sheets. Even that isn't enough so I slowly pull them down. I'm overcome by his scent and I have to taste him. He stirs with my mouth around his cock and a reassure him. Now I know what I want, what I need. I need his cum inside me to make me pregnant! I climb on top to slide his cock inside my pussy. He protests but I know he's fantasized about me so it doesn't take much to convince him. Soon I'm bouncing up and down on his cock in cowgirl position telling him how much I need his cum and how bad I want to get pregnant with his seed. He cums deep in my pussy and I'm so happy he's made me pregnant.