I could see her stepping quickly. With the treadmill sideways I could see each stride, each step and the movement of her butt. Her breasts had a little bounce. She looked different than I expected. Every so often Sasha glanced over at me.
“How did you start doing this? I mean, like THIS.”
She shrugged, “Laziness I guess. Tired of wearing dirty sweaty clothes in my workout, not wanting to wash them all the time. This way I can just shower after.” I was shifting around on the sofa, getting comfortable and trying for a better view. She was basically sideways to me. I could see her in profile.
She looks over and says, “Remember the deal?”
“Huh?”
“I get naked, you get to be naked too. Remember?”
Shit, that’s right. I had totally forgotten.
“Uh, Oh, ok.” I was suddenly flustered.
I unzipped my jeans and slid them off, threw them beside the sofa and lifted my T shirt over my head. I was in boxers, tenting in front of me. Her eyes, wide, glued to my crotch. I looked up at her.
“I’m hard. That ok?”
She laughed. “I’d be disappointed if you weren’t.”
I tugged my boxers down, watching my cock bounce straight out and stood facing her at full attention. She bit her lower lip. Did I see that right? Sasha looked at herself and at me. Damn she had tight little nipples, she was no more than five feet away from me and I sat myself down on the couch and grasped my cock, almost out of habit for being naked.
“Sit down, enjoy. And this is absolutely secret. No one can ever know.”
Her nipples were so hard and bouncing with each step. She could sense my eyes wandering over her, and raised one of her hands over her breast and gave her tits a squeeze.
“Don’t worry.”
“Not even hints. This is crazy.” She raised her hand to her breast again and let her palm brush her hard nipples. “Can’t believe I let you talk me into this. I’m all nipped out again!”
The more I looked, I could see how white her ass was, and the sharp line to her tanned legs. Could also see what a tiny little bikini she wore.
“Where do you tan?”
“Backyard. And for THAT I wear a bathing suit. I’m not a total exhibitionist. Just for my brother. HA. I would never do this with anyone else you know.”
Her butt cheeks rose and fell with each step, and the treadmill was speeding up as she began a light jog. Her breasts and buttocks bouncing, her body rising and falling with each step. The way she ran now set her legs in a longer stride and now her little bush was coming into view. She had such a lovely tightly trimmed little bush, and I could see it so much better when she was jogging. Without thinking I began to stroke the length of my cock, and my tip was wet and dripping which made my cock immediately slippery.
That caught my sisters eye, and she watched me as I stroked, her eyes glued to my cock.
“You’re in pretty good shape, you work out?” Her voice sounded breathy now.
“I bike.”
As I stroked, her hand went down lower and she covered her bush. I watched her dip in a finger, could imagine how wet she was. She held her hand there and I could tell she was stroking a finger inside her lips as she jogged. So it was voyeurism and exhibitionism at its finest. Would we masturbate in front of each other? I wanted to see if she would sit on the couch with me, sit together naked. I did not want to cum yet, but god I was horny, my fingers sliding up and down my cock. This was so wild.