My step-mom calls me in to the kitchen to discuss what I did the other day. "I thought it would be just a one time thing," I tell her. She starts to explain to me how my Aunt Cory fucks her own step-son and she wants to know if I will keep fucking her too. "If you're okay with that," I tell her. "I am! As long as you don't tell your father!" she tells me. I promise not to tell my dad, and Melanie opens up her bathrobe, exposing her naked body to me. She gets down on her knees and she starts to suck my hard cock. After a few minutes, she sits down on the kitchen chair and she waits for me to fuck her pussy in the missionary position. She gets up and turns around in the chair, so I can fuck her pussy from behind. I get to watch her big ass bounce up and down on my cock while her moans get louder. I end up cumming in her pussy and she reminds me not to tell anyone about our arrangement!