Caught by s****r and friends SeXStoRY

While still living at home with my parents and s****r I used to like to go around naked when no one was home. This happened during one of those times. We have a pool in the back yard and with the trees and fence no one can see into the back yard, except from the house. I got up a litle late on Saturday and found myself alone at home. My parents had gone to visit friends and would not be back until late and my s****r was at a girlfriends house for a slumber party that was to last all weekend. I thought that this would be a good time to go out to the pool naked and get some sun. I ate some breakfast, in the nude, and then went out to the pool. I dove in for a quick swim and then got out, turned on some music, and laid in the sun for some tanning. Probably after about 20 minutes I kind of dozed off but was brought back to reality when I heard talking coming from the house. My s****r was saying that it looked like no one was home so they could spend time at the pool tanning topless if they wanted to. I panicked, didn't know what to do and didn't have anything to cover with or anyplace to hide. Too late, the patio door slid open and I saw my s****r and two of her friends, all in bikinis. They saw me at about the same time I saw them. My s****rs friends started to giggle and stare as my s****r got angry and asked what I was doing naked. I told her just tanning and she wasn't supposed to be home, about that time one of her friends told her to calm down, no harm done, they'd all seen naked boys before. I was standing there naked with my cock getting hard as they kept looking. My s****r agreed that I could stay, but if I didn't want her telling mom and dad and if I wanted her friends to be quiet about this, I was going to have to be their pool boy. I agreed and was starting to go in when one of the girls asked where I was going. I told her to get on my swim trunks, she said no, I was to be their naked pool boy. My s****r objected, she dind't really care to see her b*****r naked, but the other girls got her to agree. Now my cock was rock hard and I couldn't do a thing about it. The girls all laid on the lounges near the pool and then called me over to undo the tops on their bikinis. I did as I was told, they were lying face down, so I couldn't see their breasts. Then, my s****r asked if I would put lotion on their backs. Since she asked, I started with her, kneeling beside her, then I went to the first girlfriend, after I did her back, she asked if I'd do her legs too, they all giggled as I awkwardly did the lotion on her legs. Then the third girl, after I did her back she rolled over and told me to do her front. This was all very unnerving to me, my cock was hard, three topless girls by the pool and now one rolled over so I could not only see her breasts, she wanted me to put suntan lotion on them. My cock started to drip precum and she saw it. She looked right at my cock and asked if I was going to squirt? I told her no, I was just getting really horny. That got all three of them laughing. The teasing went on all morning. They had me getting them drinks and snacks while naked. At least once in a while my cock would get soft, but then they'd have me rub them with lotion or dry them after a swim. It was really getting hard to keep from grabbing my cock and jerking off. Even my s****r was getting into it, at one point, telling me I was a really good sport and she knew I went naked when no one was around, she saw me a couple of times and hid to watch, that made the girls all giggle. Around noon, my s****r asked me to fix them some lunch and serve them by the pool on the patio. I fixed them some stuff to eat, sandwiches, fruit, drinks, etc. and brought it to the table. Now all three of them were sitting there topless and one of her friends said I needed a tip for being so good about this and letting them watch me. Without hesitation reached over to my cock and started to stroke it, there was a little gasp from the other two girls, but they stared at my cock. It didn't take long and I had to warn her I was going to cum, she didn't slow down, just smiled as I started to cum all over the front of her. When I was done cumming, she told me to wipe her clean and I did. Then I went to get something to eat too, and my s****r told me I wasn't done. I had to take care of them until they left and I had to stay naked. What a day. I did get one my time to cum, before they left, my s****r asked me to jerk off in front of them and eat my cum. I did jerk off, that's all I'm going to say about that time.