I helped my sister prepare for a garage sale once. Her husband was out of town so I volunteered to give her a hand. It was a hot summer night. I was wearing only a pair of running shorts with the built in briefs and no shirt. She had on a light shirt that was buttoned in front and a pair of cotton shorts.

While we moved furnature around the tight quarters of her garage, I noticed that she kept bumping into my crotch.

At first I thought it was accidental. But after the third time I realized she was doing it to cop a quick feel.

I had a partial erection which she had appearently noticed. When she bent down to put a large box down at my feet she pressed her forearm to my crotch again. Instead of stepping back, I pressed into her arm to let her know, "it was okay". I also saw that she was not wearing a bra. I got a good view of her firm, milky white breasts and her erect pink nipples. As I pressed my crotch into her arm she stood up slowly, letting her arm drag over my stiffening genitals. As her hand got into position she turned her palm toward me and pressed. My thingy was pressed against me, pointing down and to the right.

She pushed her hand along its length, then squeezed the head in her palm before letting go.

She stepped back and we stared at each other for an akward moment. I thought she would just turn and walk away and we'd never mention we did this.

But she stood there and kept her eyes fixed on my bulging crotch. What I did next surprised even me. I pulled down my shorts. I did it slowly to give her a chance to react in case she didn't realy want to see me naked. But she stared as my shorts dropped all the way to my ankles. We were both smiling from ear to ear as she watched my manhood go fully erect.

It first went completely straight then rose up to point right at her face.

Then she surprised me. She stepped forward and gently caressed my length and my balls with one hand. This felt wonderful. My length got even harded in the warmth of her hand. With the other she unbuttoned her shirt and let it fall to the ground. Then she slid both hands up and down my shaft as I moved my hands onto her tits. I let my fingers glide over her smooth skin. She moaned as I softley caressed her nipples with my finger tips. She thumbed a drop of precum ebbing from my length and massaged it into the head. But the moment was broken with the sound of her husband's car pulling up outside. We both got dressed slowly and I left out the back door so her husband wouldn't see my hard on bulging in my shorts. I went home, and took off my clothes.

While I lay naked on my bed masturbating, my sister called to thank me for helping her with furniture.

I could hear her husband in the background. She whispered into the phone that she was turned on and they were going to have great sex that night. I told her that I was masturbating. She laughed. Then she took the cordless phone into the bathroom.

I could hear the door close and I could hear her undress. Then she let out a long sigh. "What are you doing now, " I asked. "The same as you, " she whispered. Neither of us said anything for a few minutes except for an occasional moan. After a while I asked, "How you doing?" She didn't say anything. She whinced and moaned, then said, "Ooooh waaaaay!! Ooooh fuuuuckkkk meeeeeeee!!!!!" I don't think I've ever been as turned on as when I heard my sister cum. Then it was my turned. I shot a load all over the room. I moaned and whinced and swore and told her, "I'mmmm playing cummming!" We joke about it afterword, "Was it as good for you as it was for me?" We've never done anything like that since, but we've become the best of friends. We can now talk openley about our sex lifes that we couldn't before with each other.