Her face was expressionless and she started walking down the hall towards me.
She was gorgeous. I could see her large round breasts tipped with small pink nipples and bouncing lightly as she walked, I could see her flat smooth stomach and finally I could see the front of her pussy, crowned with teenage wisps of golden hair. She walked towards me without saying a word. A couples steps in front of me she turned into her bedroom and closed the door after her.
“What just happened” I thought to myself continuing to the shower. I turned the water on and took my clothes off as I realized my cock was completely hard from the little show I just saw. I couldn’t help but masturbate to the recent image branded in my mind and I came hard while the warm water flowed over me.
I knew she did it on purpose, because of what happened two days ago, only I couldn’t understand why she would do that. I decided to repay her the same way, and even though I had a towel today, I dried myself off, opened the door as loud as I could and walked out naked. My sister got out of her room dressed and observed my naked body until it disappeared inside my room.
This odd encounter became a hot unspoken game between my step sister and me for the weeks after. I would come home at the end of the day and she would usually be home. One of us would go in the shower and come out naked while the other watched from his room and then the other would go take a shower and come out naked.
Whenever Sam would take a shower first I would always enter the shower just after her and masturbate wildly to the picture of her amazing naked body.
On the first time I was the one to take a shower first, I refrained from touching myself and walked out the bathroom with my cock fully erect. The moment I got out of the shower, Sam was already standing outside her room waiting. She went wide eyed when she saw me and I noticed her bite her lower lip and stare at my cock intently until it disappeared along with me inside my room.
That day she showered longer than usual and looked more flustered than usual when she walked out of the shower, giving me the daily dose of her nakedness. The relief I gave myself that day after she saw me completely hard for the first time and I saw her in return was one of the best I ever had.
The days after that we would each try and do something to turn the other on when putting on the post shower show.
Sam would spread her legs to give me a look at her sexy pink pussy on one day, the next she would enter her room but wait for a few seconds before closing the door to give me a good look at her ass as she gave it a sexy wiggle. One day she pulled her middle finger over her slit while looking me in the eye, and another day she fingered herself then took the finger out and licked it just as she was closing the door to her room. That almost made me cum on the spot.
I in return wood try to make my cook as hard as possible for her to see, sometimes stroking it, sometimes playing with my balls and once I just gave myself a trim down there.