We have an above ground pool in out backyard. One night last summer I went outside to get something from my car. I heard a little noise back by the pool and went to check it out. When my eyes adjusted to the darkness I could see it was just my brother taking a late night dip. He said "hey its nice weather for a dip why don't you come in?" I said "No" but I kicked off my shoes and climbed up on the deck and stuck my feet in. We talked about how he would be going off to college and how different things were going to be. My brother climbed up face down on a rubber float and I could see he was naked. "****! are you crazy? What if Mom or Dad sees you!" He said "Nah, there inside watching TV." He egged me on a bit and said I should join him. I looked around a little and I was thinking about doing it. I was afraid I could be seen in the dim light coming from the porch. He teased me a bit, called me chicken. I told him I wasn't chicken just that I wasn't crazy. He kidded me saying how little miss goody twoshoes would never do anything risque'. I looked around again and moved to the end of the deck where it seemed darker. I didn't want to stand up so I slid my shorts off while still sitting down. I took a breath and pulled off my shirt and I was thinking of going in wearing my underwear. he said "Come on, go for it." I slid my panties down and tossed them aside then pulled of my bra and slid into the pool trying not to make any noise. It did feel nice, it was a wonderful free feeling floating around bare *** naked. After a bit we climbed out and shared the one towel to dry off. I pulled on my pants and put on my tee shirt. By now the house was dark, mom and dad had gone to bed. We went in and went to bed ourselves. The next morning I was in the kitchen getting some breakfast when I looked out the window and saw my dad out by the pool. He reached down and picked something up off the ground. My face was beet red when he came inside carryiing the panties I had tossed aside the night before. I think he knew but he didn't say anything. Or maybe he just thought they had fallen from the clothes line.