You dreamed of spanking your stepsister's ass until it turned bright red. Then you'd twist her nipples and fuck her until she cummed. Your imagination got a little too active and you decided to play this game with your sissy. You took a quick shower to wash off the smell of masturbation and hurried to your sister's room. She was innocently lying on the bed in her new black swimsuit, probably getting ready to go to the pool in the backyard, and texting someone. It was probably another lover. She cheated on her husband frequently and thought no one would ever know, but I often saw her with a new man in the backyard while her husband was away on a business trip. Even caught her cheating outright a couple times.... She looked beautiful. Her ass was beckoning to you, begging for a good spanking. Your mind was spinning with thoughts of what was about to happen. You sat on the bed, playing out your scenario in your head. The more you thought, the more excited you got. Your previous orgasms were a distant memory, because now all your attention was focused on seducing your sister. - I know everything. All of your cheating,” you said and looked at your sister. She hesitated and tensed a little. - What do you need to keep you quiet?” she said in a low voice after a few moments of silence. You were silent to ponder the question. In your mind, you already knew how to play your cards, but you wanted your sister to think she was being spontaneous. - I want to spank you. And then I'm going to twist your nipples and fuck you. After that, I think I'll keep it a secret. - Okay,” the sister said embarrassed. You looked at her and moved closer. Your mind was foggy from the successful seduction, and you didn't notice how your sister obediently turned her gorgeous ass toward you. You moved your hands lower and started rubbing your sister's vicious ass. With your other hand you plunged two fingers into her wet pussy.