My equally slutty sister-in-law Nora and I spent Sunday by my pool while our husbands went fishing. We were both dressed in tiny metallic micro bikinis. She was in light blue and myself in green. It was still early when as expected my neighbor went to sit on his bedroom balcony with his morning coffee. The balcony sat on his 3rd floor and had a perfect view of my yard and pool due to several trees being taken down a few ago. Nora and I began our tease simply by pulling off the tiny tops as he watched. A little bit later we pulled off each other's bottoms as we kissed before diving into the cool water. Swimming nude as he watched we played with each other’s tits and kissed. Eventually we moved out of the pool back to the chair. I sat first with Nora sitting between my spread legs with her own also open. Reaching around her one hand on her right tit my left hand running down and rubbing her pussy. My best friend was fully on display for my neighbor now joined by his much younger and gorgeous wife. I could barely see that she was now stroking his cock as they both enjoyed the show. Leaning back I grabbed a small purple bullet vibe and put it to her pink painted lips. She made a show of sucking the toy before I turned it on and slid it in her pussy. Slowly I brought her to the edge of cumming holder her there a moment. Pressing the toy on high against her clit caused her to cum loudly. After a brief rest to gain her senses she re-positioned herself on her knees in front of my pussy. Licking and sucking at my clit I was nearing my own edge swiftly. She has been licking me for years and knows exactly how to get me off. My neighbors had also changed positions with his wife now sucking his cock as they watched. Using the vibe and Nora continued to tongue my clit she made me cum twice in rapid succession. Not long after I had cum my neighbor did the same in his wife's mouth. Nora and I continued hanging out in the yard and in the pool naked for most the day playing occasionally until our husbands came home.