I woke up early and stared at the monitor. There lay Cathy, Bill's beautiful 13-year-old daughter that he and I had been spying on the previous night. I heard an alarm clock go off and Cathy finally stirred. After a short trip to the toilet, she walked to the kitchen. I walked out to join her. I was wearing only my boxer shorts and a T-shirt. She was wearing the silk nightshirt and panties that she had thrown on the previous night. She noticed I was only in boxers and she seemed to appreciate the fact, smiling a good morning at me. I sat watching her prepare breakfast. Every now and then she'd reach down and I'd get a glimpse of her wonderful breasts. She made breakfast for me and her father and we all sat down to eat. All through breakfast her father and me kept staring at Cathy. Cathy was going on about her friends. Bill then brought up the subject of getting her to invite her friends over for a slumber party. Cathy was ecstatic at the prospect and said she should be able to get five or six of her friends over for the weekend. Cathy cleared up and then went to her room to change and Bill and me went to the guest bedroom to watch. She pulled off the nightshirt and the opened her dresser to look through for a suitable top. To our astonishment she didn't put on a bra, but only a loose shirt. She obviously wasn't naive as to intense observation of her, and furthermore she liked it. Then even more surprising she pulled on a skirt, rather then her jeans. She examined herself in the mirror and then decided against the skirt, dropping it and pulling up her jeans.

She picked up her book bag and we hastily closed the wardrobe, which had been converted into a surveillance control centre. She came looking for us and found us in the guestroom. She smiled and said she was ready to go. Bill left the room to go get ready to leave. She then leant down and I caught a glimpse of her tits, though not her nipples. My dick was as hard as rock and I was still in my boxers. Cathy noticed and she just laughed. Was she trying to cause me anguish? She turned and left the room. A short while later Bill and Cathy left and I was left alone to masturbate like crazy.

I left work early and headed to Bill's house. Cathy was home from school and had changed back into the skirt. We sat chatting in the lounge for a while, and then I suggested moving outside to the pool. The sun was out and the wind blowing very gently. I went and change into swimming trunks and grabbed a bottle of tanning lotion. I flipped on the monitor to watch Cathy change. She stripped down naked and then dug about in her closet for swimming costumes. She drew out four different costumes and tried them on. The first was a one-piece swimsuit, which was very unflattering and covered a good deal. She pulled the swimsuit off. I must say I love watching women pull their swimsuits off, how their breasts suddenly pop out. She discarded the one-piece on the bed and picked up a blue bikini. Judging by her tan lines this was obviously the one she would normally wear. She studied herself for a while and then discarded the bikini. She then picked up a green one-piece which was really revealing. A little too revealing though, as some pubic hair showed. She stood admiring herself in it however.

I thought it might be time to intervene. Plucking up all my courage I knocked on her door asking to hurry up. She replied she'd be out shortly. I asked her if she was having trouble deciding what to wear. She couldn't hear what I said clearly. So she cracked the door open. I repeated myself and she pulled the door open. She was still wearing the green one-piece, with her pubic hair peeking out. I said that the swimsuit looked good. She replied that she thought it showed too much. I pointed to the blue costume and asked to see her in it. She started to pull down the one she had on, and I saw a nipple appear. She stop pulling it down and asked me to turn around. I did and a few moments later she asked me to turn back. The first costume was back on. I just frowned and told her that it was most uncomplimentary. She agreed and signalled for me to turn around again. I turned around, but peeked back. Her back was turned and she was nude, I snapped my head back. When I was asked to turn back. She was dressed in a black two-piece. It revealed more than the blue bikini and her tan lines showed. I smiled and nodded agreement. We headed for the pool.

She set her towel down on a sun bed and I sat down on the sun bed next to her. She lay down to tan. I told her to roll over onto her stomach. She looked at me questioningly and I show her the suntan lotion. She rolled over and I started applying lotion. Her skin was smooth and hot. I started on her legs working my way upward. I moved onto her back. I undid the bikini top and Cathy jumped up holding her top to her breasts. She accosted me how dare I do that. I told her that I presumed that she wanted to get rid of her tan lines. She looked fumingly at me for a few moments and then slowly, ever so slowly she dropped her arms. The top fell gently down revealing those wondrous breasts. Before she changed her mind I told her to lie down on her stomach so I could finish applying the lotion. I rubbed more on her back and up to her neck. I could feel that she was trembling, but then so was I. I returned to my own sun bed and applied some lotion.

I eased us back into conversation by asking whether she'd ever been parted from her mother for so long. After talking for a few minutes she cheered right up. I then suggested that we need some soda. She sat up, calmly revealing her naked breasts and then went to the kitchen to fetch some drinks. I sat up as she came back.As she stood in front of me, to hand me my drink, her breasts dangled only a few inches from my nose. I asked her to put some lotion on my back. I lay down on my stomach and a few moments later I felt her delicate hands on my back. She massaged lotion onto my back with a very light touch. I asked her to rub firmer and there was a marginal improvement. I then goaded her that a butterfly could apply lotion better then she could. She just laughed and finally started rubbing with some strength. I was in heaven, enjoying every moment of her firm touch.

She was done with my back and my neck and she was about to move down to my legs. I decided to push my luck. I stood up and Cathy looked a bit surprised that I'd interrupted what I had clearly been enjoying. That was nothing compared to the surprise on her face when I dropped my costume, revealing my partially erect penis. Cathy's face went bright red. I lay down on my stomach again and waited. A minute later she continued applying lotion. I looked up at her and her face was still incredibly flushed. I laughed at her and she went redder and asked me what I was laughing about. I told her that she was going as red as a beetroot. She just started laughing. I couldn't think of a more beautiful sight then a laughing, beautiful, topless 13-year-old girl. I turned onto my side so that she could fully see my penis. She stood up from where she was crouching and I reached forward to tug her bikini bottoms down, when she heard her father's car pull up. She ran off around the side of the house still topless. I stood and wrapped my towel around my waist and picked up her bikini top.

As I came around the side of the house I saw her greeting her dad, giving him a full view of her naked tits. She suddenly realised that she was still topless and covered her breasts with her hands. Her father smiled and asked what was up. Cathy seemed terribly embarrassed. I said that she was getting rid of her tan lines. Her father reached forward and flicked her bikini bottoms and pointed out that she was still keeping those tan lines. She just giggled. I handed Cathy her bikini top, and she uncovered her breasts to put the top back on. But she then halted and said to hell with it. She left the top off and headed back to the pool. Bill just looked at me with a big grin on his face. Bill and me headed inside to finalise some details about the weekend. Bill would need to get Cathy out of the way for the first part of the morning and so that I could set up the pool cameras. Bill also needed to going shopping for the slumber party. He left and I went back to my room. I picked up my digital camera and took a few shoots of Cathy from my window. She was lying down with her breasts exposed, only two metres from my window.

I put the camera down and headed out to the pool again. I dropped the towel and started to lie down, but Cathy interrupted me. She handed me the suntan lotion and asked me to put some more on. I started on her feet and worked methodically upwards. I rubbed lotion between her thighs and around her bikini. I moved up to her belly and worked around her breasts. She just lay there smiling. I sat down on her and my naked dick touched her legs. She giggled, saying that my penis was all hot. I told her that men's penises get like that in the presence of thrillingly beautiful women. I then grasped her young breasts firmly and started to massage them. She smiled, but told me to stop it, that it was making her feel uncomfortable. I massaged them for a few moments more and then calmly moved to finish up on her neck and arms. Her face was a little flushed. There was no need to rush things, so I got up and went and sat on my sun bed. I lay down and tanned my back for a while. We sat sunning in silence for a long while.

I turned onto my back and a few moments later Cathy asked if I wanted lotion. I nodded an emphatic yes. She got up and came over and looked at my dick. She told me that it wasn't as big as it was a while ago. I told her that it had cooled off. She sat across my legs like how I had done her and started on my chest. She moved downward, but then seemed unsure how far down to proceed. I asked her if she wanted to see something amazing. She nodded a curious yes. I took her hand and place it on my dick. She gave me a confused look. I told her to rub it. She started rubbing my penis. It got hard really fast. Cathy nearly jumped back. I told her to keep on rubbing it. I kept talking to her, describing to her what happens to guys. I was giving her a hands-on biology lesson. Then I couldn't hold it any longer. A beautiful, near-naked, thirteen year old had her hands around my dick and was massaging it very firmly. White cum spurted out all over the show. Some landed on her, some landed on the sun bed and most landed on me. Cathy jumped back in surprise and let go of my penis. I had to grab my dick to finish the job. After a few moments of rest I grabbed my towel and gently wiped the cum off of her. It tickled her and she began giggling. I picked her up, holding her naked breasts against my chest and threw her in the pool. I jumped in after her and we played for a while. We heard Cathy's dad pull up and Cathy jumped out and headed inside. I followed, picking up her bikini top and my costume. Her door was pushed closed, but not completely. I pushed it open and there she stood with her back turned, completely naked. She turned around holding her hands over her pubic area. She asked angrily what I thought I was doing. I apologised and held out her bikini top. She took one hand away from her love box to take the top. I winked at her and then let her close the door.