Sister In Law

This happened years ago, around the time my wife and I were just dating. I was staying at her house for the night and I stayed in a different room than her at the time to appease the family. Her sister always flirted with me from the moment we met. Wearing little shorts around me and clearly noticing when I would look at her. One night we all went to sleep and I found myself alone in the room again trying to sleep. I just couldn't. After tossing and turning for about an hour I finally dozed off. I remember having a very hot sex dream and finally waking up and realizing that the dream was a bit more. I looked down to see my wife's sister, her mouth wrapped around my cock and staring up at me with a little grin. I initially resisted but her held on and smiled while shaking her head no. "If she's not gonna someone should" she said as she again deepthroated me. she was so amazing and looked so hot I couldn't stop letting her. I rubbed her tits while she blew me and I felt myself ready to blow. I told her I was about to cum and she immediately started sucking fast and harder. I couldn't hold back and let myself shoot my load in her mouth which she moaned as it hit the back of her throat. She swallowed every drop, kept gently rubbing my cock while she moved up and kissed me and whispered in my ear "next time maybe you can do that on my face or in me."

I won't deny that we've fooled around a bit since then. Now and then sneaking away for a quick blowjob or a quick little fuck to get our rocks off. Once she sat on my lap in a pool and moved everything around so she could ride me in the pool and making my cum inside of her. There are times I think about if I should feel bad, but it's hard considering my wife knows its happened, and twice has joined in, not thinking it's weird cause her sister is actually adopted into the family. I wonder if she thinks about m and her sister while she plays with herself when im not around.