I'm only allowed to have sex with my stepfather, as per his strict rules

My stepdad has forbidden me from fucking anyone else but him. He\'s strict, but he\'s also huge and I can\'t resist him. I\'m a beautiful teen with a small pussy, and he\'s the only one allowed to fill it. Every time I suck his dick, I can taste his cum on my lips. It\'s a strange arrangement, but it works for me.