My pussy stretched as Rob's thick cock penetrated deep within me. I arched my back wrapping my legs around his muscular torso and turned my head to see Cassie. Our eyes met and she smiled. I was still a little nervous about the whole situation but it was fading as I relished her boyfriend's wonderful cock sliding in and out of me. I kept my eyes locked on hers and pinched my nipples aggressively. This was her idea.
Cassie and Rob have been together for about five years. I've known the both of them for a little over seven. I remember Cassie telling me how great Rob was in bed and how nice his cock was. At a little over eight inches and as thick as my wrist she didn't lie. The last year had been hard on them. Both working, finishing school, getting new jobs and the sudden death of Rob's Mother put a huge strain on their relationship.
Cassie confided in me that Rob's sex drive was next to nothing but she wasn't about to break up with him or have an affair. She wanted to make him happy and get his sex drive going again. In our detailed discussions about sex Cassie had entertained the fantasy of watching Rob fuck another woman. She also wanted to have a threesome with another man or woman with Rob. None of this ever happened but that was about to change. Cassie was beautiful. She had the body of a dancer, average sized breast that were still full and the hips and legs most women would kill for. Her face was girlish and if it weren't for her body and personality she could pass for a teenager. Her reddish brown hair hung straight as an arrow half way down her back and when she had it braided to the sides she was the cutest thing in the world.
In the weeks prior to Rob fucking me with his awesome cock Cassie and I had to prime the pump, so to speak. I was surprised when she brought the idea up and rejected her plan at first. I gave in after some consideration and knowing how much she wanted Rob to get back to his old self. She told me that Rob found me attractive and when she had mentioned a threesome with me he had no objections. We went to a sex shop and bought several porno videos, a few toys and a blindfold. Then we went to a store that primarily sold clothing for exotic dancers and purchased platform heels, and about ten different outfits and just as many bikinis. Cassie also ordered a subscription to Penthouse, not for the articles.
When the first issue arrived she and I went to work teasing Rob. With the excuse that summer was here, we modeled the bikinis for him and made him take pictures. We posed lewdly together but kept it clean enough so that he wouldn't suspect anything. Cassie and I slipped a few of us changing as well to force the issue. Later that night Cassie sucked him off but he was still in his funk and went to bed early. For the next week Cassie wore next to nothing around the house and when I visited I followed suit wearing baby T-shirts and skimpy shorts or skirts.
On the weekend she invited me to a BBQ. It was a hot day and we both wore our bikini tops and shorts. Rob and I sat on the deck sipping margaritas and talking when he mentioned the photos. I smiled and blushed when suddenly Cassie sprayed me with the hose. The force of the water had somehow unhooked the front clasp of my top. My breasts sprang free as Cassie continued to spray me. I scrambled behind Rob and held on to him pressing my bare breasts against his back. When Cassie stepped closer I snatched the hanging string of her top and pulled it off. Rob grabbed the hose and drenched the both of us until we ran back into the house. Despite the cold water Rob had a noticeable erection we were all horny and Cassie decided that it was time.
