Favourite Cousin

Further to my story of my aunt fantasy, her eldest daughter, who is just a couple of years younger than me, has also grown into a voluptuous woman.
We were all very close as kids and we still are, now we're late 40s early 50s. Family get togethers etc.
When i was 19, H was 17 and i used to take her into town drinking with my mates and sometimes a couple of her friends would tag along too. If she was alone, Id walk her home. One night i walked her home, her mom, dad and younger brother were away on holiday. She was nervous about staying alone, so i said Id stay over. I went to bed in her brothers room, she in her room. I woke a little later to find her completely naked in the single bed with me, spooning me. Now, like her mom, she had big titties and they were firm. I could feel them pressing against my back. I turned around and we kissed passionately. In an instant, my boxers were off and she was riding me. That tight pussy and big tits were too much and I had to pull out at the last stop to cum all over my stomach and chest. Wow, so much cum. I lay her down and ate her pussy until she orgasmed hard.
After a few silent moments, we lay there and just laughed, almost out of embarressment, certainly for me. I cleaned myself up in the bathroom and thought about going home. As i came out, she was in her bedroom doorway. She got my hand and pulled me into her room. We fucked several times that night and it was amazing. I left in the morning.
We spoke about it briefly on another night out but just to say that it wouldnt happen again.
Time has gone on, both married with kids and nothing ever said about it. Until my 40th. She had a fair bit to drink and confessed that she still thought about it and wouldnt say no to a repeat session. That threw me.
That was over 10 years ago now since she said that. Im tempted as my home sex life is virtually non existent. A regular blow out could be just the ticket.