Yesterday my wife and her sister went swimming in a lake near us. When we got back to our apartment we decided we should all take turns showering to get the lake off of us since we were going to go out for dinner together after. My wife went in first and while she's in my sister in law asks if we have any drinks. I pointed over to the mini fridge in the corner of the living room and said there might be a couple beers in there. Instead of walking over she got on all fours and crawled over, doing so her bikini bottoms rode up her ass revealing it all to me. I have always thought she is hot and seeing her ass like that, bent over, was making me really hard. I grabbed a couch pillow and put it on my lap. She grabbed us both a beer and came and sat right next to me on the couch. She told me she knew I was staring and really quickly pulled the pillow off me. It was impossible to hide my boner in my swim trunks. She told me she has been in a big dry spell and she was turned on seeing me swimming today. She slowly started rubbing me over my trunks. I told her this wasn't okay and my wife, her sister, could be out of the shower any moment. She said we will listen to when the shower shuts off and she pulled down her top. Her tits hanging out looked amazing. My horniness took over and I went straight to sucking on her hard nipples. She breathed heavily and moaned and I slid my trunks to my ankles. She stood up, pulled her bottoms down. She had a sexy bush that I didn't notice when her bottoms were on. At this point I was throbbing. She climbed onto my lap and I slid my throbbing dick into her tight pussy. We both started breathing harder, trying to stay as quiet as possible. She bounced and grinded on me until I felt like I was about to cum harder than I ever had. I tapped her on her hips and told her I was close and she had to get off. She said no way and kept grinding harder. I couldn't help but cum inside her. It seemed like as soon as I came the water turned off. She got off me and got dressed again quickly. She told me thank you, that she really really needed that.
