This is kind of embarassing but also kind of exciting for some reason as well.

My husband and I have lived in this neighborhood for almost 6 years now. I have become good friends with the family next to us, especially Renee who is the mother of a 14 year old boy. We only have 1 daughter, and she works a lot of hours during the summer so she is not home much.
Anyhow, we have a nice pool and patio, and Renee and her family know that they can come and use it any time they feel like it.
The other day I was laying out getting some sun, and Renee and her son Zack came over. They asked if it was o.k if they swam for a bit, which I assured them it was. After only about an hour, Renee said they had to get back home since she had some shopping to do. Zach asked her if he could stay, and since I was o.k with that and told Renee I would be there to watch him, she left.
It was not until after she left when I really started to notice Zach checking me out. I had my sunglasses on, so he had no idea I was watching him watching me. I felt so silly, but when he was close, I would adjust my bikini to expose myself little more to him "accidently". At one point, I layed on my stomach and pulled at my bikini bottoms up a little as if I was just getting myself comfortable. I am sure Zach got a great view of my butt.
I decided to be more daring, and I unfastened my top (so I would not get a tan line there of course). Zach got so quiet in the pool - I can only imagine what thoughts he must have been having.
But for some reason, I found myslef getting aroused at the idea of this boy checking me out. My heart was racing a little faster, and my breathing became more deep just from me showing a little more skin to Zach than I should have been.
My last bold move was to sit up without tying my top, so I basically exposed my breasts to Zach for a few seconds while I reached around to tie it back on.
I found myself wondering if he got a hard-on, and what it would look like. My husband is not that big size-wise and I wondered to myself if this kid would be as big, or maybe even bigger than my spouse. I was having so many crazy thoughts!
Renee was only going to be gone for about an hour, it it had been probably 50 minutes already, so I knew there was not too much time left. I told Zach I was going to go in and rinse off in the shower, and that he could come inside if he was thirsty of if he needed anything. I purposely left the bathroom door open about 1 foot as I stripped and got inside the downstairs shower that has a glass door on it. My heart started racing even faster later on when I was finished, and I saw that the bathroom door was open the whole way. Zach watched me in the shower! omg...I actually had to touch myself a little that excited me so much.
By the time Renee came back, I was in shorts and a tee shirt and Zach was back in the pool. If only she knew all the teasing I was doing with her son, and that he son saw me naked in the shower.

When my husband got home that evening, I just about r**ed him. I was still so horny! The entire time we were having sex, I kept thinking about Zach. I have had so many daydreams about what could have happened - and what might have happened if he just joined me in the shower.

I am ashamed at myself for some of the thoughts I have been having.

I do hope Renee brings him over more often, and leaves us alone more often, too. I tell myself its just fun teasing, but you never know.