My wife and I have been in an open relationship for awhile now and had our fair share of partners. From strangers to friends and everything in between.

Earlier this month my wife sister came to visit, she loves about 3 hours away and comes by maybe once every 3-4 months. She came to visit because her husband was put on nights for about a week for some project or something at work.

She, my wife, and my wife’s best friend were all going out for date night which was pretty typical when she came to visit and I didn’t think much of it.

About 1.5 hours after they left my wife’s sister came home alone. She claimed she was feeling tired after the driving and not accustomed to the hotter weather where we live. I grabbed her a glass of water and we chatted for a bit. Not long before she asked me about my wife and Is marriage. It’s not that we are secretive about our open marriage but my wife has not advertised it much to her family so I was surprised she knew. She asked a bunch of questions and sneakily threw in “would it be cheating to fuck me?” To which I smiled, winked, and said no.

After she grilled me for a few minutes she got up walked behind me and traced my arm and shoulder with her finger. I followed her with my eyes wide grin. She went to the bathroom and when she came back she was showing a ton of cleavage and sat down next to me on the small couch. I leaned in for a kiss when she turned and sat on my lap as we made out. I quickly took off my shirt, then hers and began to kiss down her neck and cleavage. She gasped and screamed “YES!”. I unclamped her bra and pulled it off to expose her amazing boobs. So similar to my wife’s but just slightly bigger just enough to make them more fun. I began sucking and slapping her tits as she moaned and screamed. She’s so much louder than her sister. I love it.

I pick her up and throw her on the couch. Pull of her shorts and panties all at once. I began to eat her out. She’s so similar to her sister, she squirms the same, her voice is the same when she yells and she tastes the same. It’s like fucking my wife for the 10,000th time but with a touch of taboo. She cums on my mouth before I flip her over, rip off my clothes and grind her ass on my cock to tease her. She loves the tease, something else she shared with my wife.

I fuck her in many positions before I cum all over her while fucking her missionary. I love the intimate ending to the most taboo fuck of my life. She gets up to go clean up and she looks at me with a creaky grin. As I stare at her naked ass she just tells me “I don’t know i want my sister knowing about this and my husband certainly can’t know.” Then disappears into the bath room to get dressed.

I didn’t tell my wife for about 2 weeks and she just laughed saying she knew her sister wasn’t a little bitch that couldn’t take the AZ heat.