I have two most memorable cocks that I have sucked but if I had to choose I would go for this one....
I picked up a guy in a bar in Leicester Square in London, it would have been late 80's, early 90's but neither of us had anywhere to go.
So we walked to the nearest train station and in those days there were still some trains that consisted of individual compartments that could only be accessed from the outside as there was also no corridor.
So we got into an empty compartment and waited for the train to leave.
This guy had one of the longest and most beautiful cocks I have ever seen and as soon as the train moved off I was down on my knees sucking it. It was so long that there was no way I could take it all in my mouth so I started to give him a helping hand whilst still keeping as much of his cock in my mouth as well.
The memory that stays in my mind the most about this encounter was that when he came I actually felt 3 pulsations starting from the bottom of his cock up to the head before the cum reached my mouth.
Afterwards we just got off the train at the next station, changed platforms and made our way back again.
Shame that train type doesn't exist anymore, as they were great for a 'private party'.