My sex life has always been amazing, I'm lucky that way. I married this wonderful divorced woman with a 20 year old son. He's kind of a quiet overachiever with few friends, and focused on college. About six months ago I noticed some strange files on my computer. I dug through and found all these links to porn sites with shemales on them. The time coincided with when the son was alone at home. I thought it was strange, but no big deal. I figured it was a 'safe' way for him to explore his sexuality and curiosity. Hell, I've enjoyed both men and women in my life. About two months ago I came home early to pick up some work papers. I came in through the patio to save time and I heard the slapping sound of someone having sex. The moans and whimpers I heard were my wife's. I froze, just listening. She was getting a good pounding, from what I could hear, hard and fast. I quietly snuck up to our bedroom door and stole a look. My stepson was slamming his cock into his mom's cunt like he invented fucking. I nearly freaked! I pressed my back against the wall in the hallway frozen with my ears full of her moans and cries and his grunting. I didn't know how to act. I realized, though, that I had a raging hardon almost instantly. It was the most erotic, confusing feeling I've ever had. I went back down the hall willing myself to think, trying to figure out how to handle the situation. I wanted to see more, but I didn't want to. I wanted to run, but I was fascinated with the whole thing. My hardon led me to want to see more. I went out onto the patio and crept up to the bedroom window. She was up off her back now and was gobbling his cock. They were so intent that there was no chance I'd be noticed. It was amazing to watch. I had my digital camera from work in the car so I ran and grabbed it. When I got back he had her up on all fours and was mounting her from behind. I started snapping pictures. The expression on her face was wonderful. Pure lust. He flipped her over again and finished fucking her face to face. I got great pictures. I split out of there back to work, but I was useless the rest of the day. A couple of days later, after having time to go over the pictures again and again, I took the day off. I had it planned where my wife was working, and my stepson had a short class schedule. We've always gotten along, so I started by bringing up the shemale links on the computer. He was embarrassed and didn't know what to say. I assured him that it was a normal curiosity, and in this day and age there was no reason not to try things sexual that he might be interested in. I let him know that i'd had my share of experimentation, and I was good a keeping secrets. Then I showed him the pictures. He was devastated. He was worried about getting his mother in trouble, most of all. He begged me to promise to get rid of them and offered 'anything' if I would keep silent. Long story short, I had him strip down and suck me off. I figured he was curious, and looking at the pictures again made me horny. I essentially taught him how to give a good blowjob. I gave him a hand job and jammed a finger up his ass when he came, which blew his mind. A couple of days later, we were at home alone again. I pulled my cock out of my pants and told him to get busy. He did and it was better than the first time. This went on for a couple of weeks, and then he started asking for it. It seems like he can't get enough. I blow him when i'm in the mood, and i've ass fucked him a couple of times now. It was his idea, since I fingered him while he was coming the first time. I understand, a stiff cock up the ass feels good. His mother likes it, I know. Us fooling around together has made us both horny, and she's been getting fucked silly almost every day. She hasn't complained a bit. My next step is to show her the pictures. Then we'll both fuck her. I don't think she's going to mind. Then I'll own both of them totally. I'm such a bastard.