Wife Was Away, Sis Will Play

Last friday my wife left for NYC. on business for the weekend. Well Sunday was a nice day to hang around the house and do nothing at all. Around 8:00PM my sister called and asked if I wanted to take her to dinner seeing that she knew I was alone for the weekend.(She and my wife are always talking and shopping together). My sister is 21, in college and always in the mood for a free dinner and drinks. She came over at 9:00pm and we went out. Dinner was good but the drinks were better. By the time we got back to my place we were kinda toasted. Julie went into the bathroom to go pee, while in there she yelled out to start up the spa for a soak. I said cool, and that she could wear one of my wife's bathing suits but I didn't see how she would fit into any of the tops, seeing that her boobs are much bigger then my wife's, but why not just wear your bra instead. As I was outside starting up the spa I could see my sis inside getting something to drink. By the time she walked up to the patio door I saw that she only had on a bathing suit bottom and no top! As I stood there with my mouth open she just handed me a glass and walked by. I said to her 'WOW, boobs and beer you sure know how to greet a guy sis'. She just smiled and got into the spa. We made some small talk but my eyes were always going back to her boobs almost floating on the bubbles. I was getting a hard-on and needed to cool off some. I said that I needed another drink and got up from the spa. She said 'Wow you really are my BIG brother'. I looked down at my shorts and the water had them sticking flat to me and my cock was very hard and sticking out the top for her to see. At this time I think my cock had taken over me, I just reached down and pulled out my cock and kinda shook it at her while saying, 'Do you mean this?' and walked away to get something to drink. When I came back Julie was sitting on the edge of the spa, the water and the lights were making her tits look great. I handed her a drink and sat across from her. She asked me if she had been the one that made my cock so hard? I told her that Jenn (my wife) had started her period on Tuesday and that I have not had any sex since last week. Julie said that I should just jerk off to relieve the pressure. I told her that I would need to tonight before I went to sleep, if I was to get any sleep at all. Julie said 'Why wait? lets do it right now!' Now when she said lets do it, I didnt know what she had in mind but my cock wanted to see. At that time Julie started to rub her nipples and massage her large tits. I then stood up and kicked off my shorts to reveal my cock that was at full attention. With Julies eyes on my cock I stroked it and watched her massaging her tits. I wanted to see her pussy very badly. At that time she reached down and pulled her bottoms to one side and leaned back some and started to work on her beautiful smooth pussy. My eyes were fixed on her pussy as she slid in two fingers. I was stroking my cock faster now and pulling down on my balls so not to cum too fast. Julie was fingering her pussy faster and pinching her nipples with the other hand. As she pinched her swollen clit she let out a sigh and said she was going to cum and wanted to see me cum too. I let go of my balls and rubbed the head of my cock and said I was about to cum! As I shot loads of hot cum across the hot bubbling water towards her she pinched her clit and nipples and came on her fingers. When we had both regained our composure she swam over to me and said that Jen had asked her to come over this weekend and see if there was anything that I had needed. I smiled at her and said I didn't think that this was what she meant!