I picture she is our niece. This niece has her own history which makes her ideal for my fantasies. When she was a late teen starting college, she used to come over to the house and hang out for weekends. That very weekend wife had a date and we were all going on a 2 night trip to the local villages. Niece arrives as we are leaving. Without thinking we say come along! We didnt quite think it thru! So we pick up wife's BF from a local hotel and went on our way. I drove but wife had niece sit up front. She sat in back with BF for the 4hr ride.
Wife was horny and was soon making out in the back seat. Then her miniskirt legs across his lap. His hand up her skirt and obviously fingering her lightly. The moans and sighs gave them away.
Niece is chatting with me and I am the embarrassed one. She seemed to be cool with the arrangement.
We took two rooms once we arrive. Wife and BF in one and me an niece in the other adjacent room. Again, wife held hands and embraced with BF like honeymooners while niece and I followed two steps behind talking.
We also hung out at a bar. What I didnt pick up until years later was how much niece kept talking about what a wonderful uncle I was. I was like "whatever!....
Than night, the loud moans thru the door and bed banging was enough evidence that "auntie" was fucking the other man insted of uncle. Again, as we fell asleep (separate beds) she kept on yapping about how wonderful I was to my step kids, etc.
Next day, after breakfast they ask us to wait in lobby. They went up for another round of sex while we patientily waited. It couldnt have been more obvious.
Few years later, she becomes an adult English teacher. We learned that she would go on dates with several of her students and there had been sex involved. Later she did marry a guy. yet she was caught fucking other guys more than once. Recently she fucked a friend of my step kids as well as the ex boyfriend of another cousin.
So back to my fantasy. I picture that my wife has asked me to mercy fuck the niece. Sure she is now in her 30s, but a niece is a niece. Wife wants me to eat her creampies also so that she herself is free to continue fucking boyfriends.
Sometimes I make it more sophisticated. I imagine the other nieces are sitting around the bed. Niece wants to show the other incredulous nieces how she landed her own uncle in bed.
And when wife is out of town and I jack off, I fantasize that wife is making me masturbate in front of all the nieces to show what a cuck and sissy I am.