This happened when my wife and I were dating.
We had only been going out a few months and had not yet slept together. But, that doesn't mean we could keep our hands off each other! One of those nights turned out to be pretty special for each of us.
We were in bed and had already 'had our fun' for the night. We were spooning, with her to my back. I was starting to drift off to sleep when she took my hand and placed it on my penis. I rolled back and looked at her. She said, 'I want to know what you like'. I asked, 'Do you want to watch'. She said, 'Yes!'.
We both got up and I propped myself up on some pillows, she sat near the end of the bed.
I have always like having my nipples played with (she did not yet know this) so I started to slowly rub them, while looking her in the eyes. I asked her to take off her nightgown and she complied. There, sitting in front of me, was a beautiful naked woman, and I was masturbating. I had fantasized about this since I was a teenager and it was finally happening!
Eventually my right hand left my chest and moved to my now throbbing penis. Pre-cum had begun to leak, so I took a little with my left hand to lubricate my nipples.
I have an unusual way of rubbing myself. Rather than the usual 'fist pump', I prefer to rub the portion of my dick just under the head in a circular fashion. This rubs the head on my belly and stimulates the most sensitive part of 'myself'.
Sometime during this, I got self conscious and told her I was going to stop. She said, 'Even if I am getting incredibly turned on?' I asked if she wanted to join me and she replied, 'No, I want to take all this in'.
I went back to myself and gazed at her. Her large breasts and beautiful triangle of pubic hair looked fantastic in the soft light. Her eyes were all over me and it was so sexy to watch her watch me. I soon felt the pressure building. I remember saying, 'I want to cum on your tits.' She slid to the bedside and let me do just that.
As we kissed, I looked at her and said, 'That had always been my biggest fantasy'.
We've repeated this a few times over the years but it's not something she enjoys as much as I do. I am happy though in that now I do get to watch her from time to time. What a beautiful thing to get to watch!