I've had a unique and special relationship with one of my wife's nieces for some time now. It started with a lot of teasing when she was 15 but got really serious after she turned 18. She is now in her early 40's and married with a one child.
She, along with a house full of people ate with us Thanksgiving. I was horny that day and my niece is always horny. There were too many people around for us to do anything. About an hour after lunch I got up to get a bottle of water from the fridge. She walked in the kitchen as I was leaving and I whispered to her, 'Go to the bathroom off our bedroom and put your panties in the hamper. You can pick them up later.' She smiled and said, 'You must be horny.' I told her I was.
I went back to the sun room where most of the folks were sitting and sat down. About 10 minutes later my niece walked in the sun room and sat down. She looked at me and winked. Everyone was talking and no one was paying any attention to what anyone was doing. I got up and went to the bathroom off the bedroom. I locked the door and dropped my pants and sat down on the commode. I opened the hamper and there they were. I didn't realize she had masturbated in her panties until I picked them up and looked at the crotch. The crotch was good and wet with her girl juice. I took a smell and my dick jumped to attention. The smell of her pussy turns me on like nothing else. I started jacking off while licking the slick juice from her panties. I knew I would cum quickly because her pussy juice does that to me. I licked and sucked the crotch of her panties clean before I was ready to cum. I held the crotch of the material down to my dick head and shot several ropes of cum in her panties. I put the panties back in the hamper, cleaned my dick off and pulled my pants up.
As I walked back into the sun room it was now my time to wink at my niece. She made some comment about getting her some water and left the room. A few minutes later she returned. She had a big smile on her face. When no one was looking she held up two fingers. I took that to mean that she had masturbated a second time, the last time with her panties filled with my cum.
She loves to do sneaky things like that as do I. It's like doing something naughty almost in the face of others without them knowing what's going on.
Later that afternoon as people were leaving she hugged me and kissed me on the cheek. She whispered, 'Your hot cum feels good on my pussy.' I looked at her and said, 'And you smell delicious, good enough to eat.'
After everyone was gone my wife said, 'That was a great Thanksgiving. I think everyone had fun.' I said, 'I know I sure did.'