I never had any unusual brotherly thought toward her; just the usual teenage stuff. But, this evening I wanted to test out the FU-69 and see how easy it was to change the colors of the images with intentional external stimulus. I figured I was safe with my sister as I didn’t want anything from her anyway. It didn’t occur to me that I was playing with fire.
As I walked in she had a faint lilac image with a “V” indicating she was thinking about having her pussy eaten. When she saw me the image disappeared altogether. But, as she took the bottles of wine a faint yellow image appeared momentarily indicating a desire for water sports but this quickly gave way to a little stronger bright green image as she just desired to fuck someone.
As we sat down to eat the images again went away but occasionally glimmers of various colors would shine for a few seconds the most prominent of which seemed to be white. Wanting to see if I could illicit a particular color I put an extra scoop of sour cream on my potato. I was hoping to make her glow dark green with an “F” over her head for sex with food.
I spilled some of the cream on my shirt and slowly and deliberately scooped it up and licked it from my finger using a lot of tongue action and moaning as I did this. I repeated this scene twice more and sure enough the second time the hoped for image appeared and Diane looked away saying nothing.
Apparently not only could the unit be used to tell if a woman wanted a particular sex act but it could also be used as a seduction tool. After dinner we were carrying the dishes to the kitchen and I did something I had done dozens of times before. I playfully slapped her ass telling her to get out of my way.
The difference this time was that a brilliant orange image appeared for a few seconds quickly followed by a brown image. I had no more than cleared my throat when all the images disappeared again. I decided that I had succeeded in my experimentation and would just enjoy Diane’s company the rest of the evening.
We sat beside each other on my roomy couch and she picked out some show on TV that had a lot of sexual innuendo. I checked her out and she had a bright tan glow. When she looked me in the eye it faded but was still prominent. Seeing if the image would get brighter I placed my arm around her shoulder and the image warmed noticeably.
Next, I put my other hand on her knee and the up arrow began to form. By the end of the show she was leaning against me and I was caressing her lower thigh. I was about to break free of the situation when Diane spoke up. Very calmly and is if it were a typical question she asked, “I‘ve not seen much porn and I bet, knowing you, that you have some. Can I watch one of them?”
In vain I tried to deny ownership of a porn collection. But, my sister was no dummy. I brought out half a dozen titles and she picked one that I popped into the VCR. It started kind of slow setting up the thin plot line. But, before long, there was enough hot sexual action for even the most critical porn fan.
Whenever I glanced at Diane there was a bright glow around her matching the action on the screen like gray when one lady was rimming another gal’s asshole. But, the first few times she looked at me the image instantly disappeared. About a half hour into the flick the image was suddenly tan with a pronounced up arrow.
Lovingly I pulled Diane into my arms and ran my hands all over her back, thighs, and belly. Honestly, I had forgotten that she was my sister. My hand grazed the bottom of her boobs and she did nothing to pull away. I whispered, “This is pretty hot isn’t it. But those girls have nothing on you!”
Seconds later she was caressing me all over and we were smooching with my hands now cupping her D cups. I had no more than given her breasts a squeeze then the image turned powder blue with a large “M” showing flashing wildly and the audio cue saying, “Now.” I slid my hand back to her thighs.
Unceremoniously I unzipped her fly and then grabbed her hand and placed it on my zipper. Seconds later she had extracted my cock from my pants and was expertly jerking me off. My hand was working feverishly on her cunt through the silky material of her panties. Throatily she huskily whispered, “Go under my panties.”
Diane dropped my cock long enough to unfasten her pants and push them down just far enough that I could slide my hand inside of her undies and push two fingers into her steamy snatch while rubbing my thumb across her clit. We didn’t look at each other as our eyes had returned to the television transfixed by the picture while bringing each other closer and closer to hard orgasms.
As the woman in the show rode the guy cowgirl style Diane and I were moaning loudly. Diane shuddered and flooded my hand in honey about the same time as my cock erupted covering her hand in my seed. Just as I looked over at my sister the image totally disappeared and Diane’s face turned beet red with her mouth wide open.
“Oh gawd, oh fuck, we can’t do this you’re my fucking brother,” she stammered coming back to earth. I gave her a hug of understanding and she quickly got up and tried to refasten her pants. Her ass was right in front of my face. I couldn’t help myself and hugged it. In a panic she ran off to the guest bedroom.
I decided not to follow her right away to give her a moment to gather her thoughts. I sat on the couch and half watched the video. Five minutes later she came back out having changed into her conservative silky floor length nightgown. Afraid to look up at her, not knowing what to say, I spoke, welcome back sis.”
“I’m ok brother, but what we were doing was wrong,” Diane said sitting back beside me and patting my knee. Then I looked directly into her face and was utterly shocked at the image radiating from my sister. I refused momentarily to believe it. IT was a brilliant flashing gold with and up arrow. I shook my head from side to side in disbelief.
“Take her,” the audio unit spoke. My sister would do nothing about her lustful thoughts as societal taboos would prevent her from taking the final leap into incest. As the video played on I could feel my sister squirm on the couch. I was having a war in my head between my lustful thoughts and being a proper brother.
Standing up beside my sister I ripped off my clothing deciding to pay close attention to the image in case she changed her mind and didn't want to be ravaged as the gold image indicated. Totally nude I sat down beside her. Diane had a puzzled look on her face and could say nothing but the image was as bright as ever.
Looking her in the eyes I swallowed hard and reached out and cupped her large melons and smashed my mouth into her kissing her passionately. Diane put her arms up to fend me off. But, I ignored her struggling as the image was still burning bright and shoved her flat on her back to the couch.
Her protests quickly died as she clawed her nails deep into my back. As I nibbled and bit on her back a new kind of image appeared. The gold image remained glowing brightly but in the center of it other colors would appear in a circle indicating what particular act my sister was thinking of as part of the larger act.
I took these more as guideposts and suggestions continuing to do what felt right to me and what I was hungry for. I figured I was ok as long as the gold burnt brightly. Our pelvises ground together as I savagely bit and nibbled on her ear, neck and shoulders. Excitedly Diane cried out, "Fuck yes take me! Go ahead and rip the fucking gown and panties off. I need cock in my pussy; your fucking cock now!"
On my second attempt the material of the gown gave way and I tore straight down her belly exposing her perfect globes. IN seconds my mouth and hands were feverishly giving her tits a workout. Her hands were nearly tearing out my hair as I moaned, “Admit it sis, you’ve wanted my cock forever, haven’t you?”
“Fuck yes and I don’t expect to wait another fucking second. Get that fucking thing inside of me this fucking second,” she growled while slamming her hips up to meet mine nearly knocking me off of her. Hotter than ever I rolled off of her and reached to rip off her panties but she beat me to it. In a fit of lust she ripped the sides out of the string bikini.
