Anne's confession

The photo is of your mother, nude, laying on her back on her bed, legs spread wide, eyes closed. You instantly feel yourself growing hard, and laying back on your bed, you pull out your dick and start masturbating to the picture. You can feel that this will be a quick orgasm, and are already mentally planning to keep jacking off all the way to a second orgasm.

Without warning, the door to your room opens. There is no knock, just the sound of the door to your room opening. Terrified, you slap the printed photo face down on your chest, and try to slip your dick back into your pants, but you are so hard, that it takes you a full two or three seconds to jerk up your shorts enough to be able to slip it back in. Clearly, you were not able to hide anything from whoever opened the door, but at least it's put away now.

Your sister sits down on the bed by your feet. You know that there was nobody else it could have been, but in your mind you were hoping that maybe it was just the wind blowing the door open. Or, at the very least, she would be shocked by what she saw, and leave without saying anything. Anne just sits there, still wearing her pajamas, looking at you. You wait.

"I know," she finally says. She pauses a second, then continues. "The first thing that made me wonder was last week, when I came home, and the leaves were in the exact same pattern on the driveway in the evening as they were in the morning. I remembered that you said you had a doctor's appointment, and that you were going to take the car. Looking at it in the garage, it was pretty clear that it hadn't been driven that day. I came inside, and was talking to mom, and she got this weird look in her eyes, like she was watching something behind me. I followed her gaze, but there was nothing there but the stairs to the basement. I went downstairs to see what was going on, but there was just you there, wearing different clothes than you had been wearing in the morning. That's why I asked if you had anything you wanted me to throw in the wash. I was confused when you said you didn't." Anne pauses again. "Obviously, all of this was a little odd but I put it out of my mind. Yesterday, though, when I came home, mom was fooling around on the computer with her new camera, and you were spacing out watching television. When I got out of my shower, you were out of it, sitting on the couch, staring at nothing, with an erection. It was a little awkward, but my show was on, so I watched it. You and mom were acting so weird, though, that I decided I needed to do a little detective work." Anne stops again, and smiles.

"So, I pretended to be sick. I'm not sick at all, of course, but mom doesn't ask questions. She's been running errands for most of the day, and as soon as she left the house, I started to search around. I came down here first, since you've been acting the weirdest. It didn't take me long to find your shoebox of porn, which I suppose is probably normal enough for a teenage boy, except for one thing: all the pictures of mom. I figured they were probably pictures that dad took, and that you had a thing for her, which is a little weird, but she is very attractive so it's not that weird. I went upstairs to mom and dad's room to see if there was a recently raided picture stash, but what I found is not only pictures of mom and dad, and man do they do some kinky stuff, but also pictures of you, including pictures of your penis between her breasts and in her mouth."

She stops, catches her breath. "Obviously, not only are you two attracted to each other, but you're also having sex." She stops again, a faraway look on her face. "At first, it really bothered me. I mean, you're not supposed to do that, right? It didn't bother me that much that you were attracted to her body, or that she was to yours, but that you actually had done anything about it I guess was the problem." She pauses again. "I mean, we're an attractive bunch of people. Mom's attractive. Dad is too, and so are you, and so am I. But you can't actually DO anything about it, you can only think about it." Anne wrings her hands as she talks.

"The thing is," she says slowly, choosing her words carefully, "the pictures of mom tied up and dad fucking her really turn me on. The pictures of dad flexing, of mom holding her pussy open, of you on a lawn chair nude with a stiff cock ... all of them really turn me on." Anne bites her lip. "I took that picture of you on the lawn chair, and right there, on mom and dad's bed, I masturbated to it." Anne halts again, then smiles. "And from what I saw a minute or two ago, that cock is just as big as it looks in the picture." She looks down at the bulge in your pants, and continues. "Anyway, what I'm saying is, whatever you have going with mom and dad, I'm interested."

I don't have anything going with dad, you think to yourself, then you wonder. Who knows but that he is in on this with your mom. You don't know what to say, so you just say "Have you talked to mom yet?"

Anne smiles, and shakes her head. "Just you. And I think that's all I have to say for now." She stands up, and walks out of your room.