I was around 20 at the time and it was summer in the 80's. I was gainfully employed as a Postman and always wore short shorts to work.A number of housewives took an interest but one particular male customer who was in his sixty's always appeared at his door whenever i had a delivery for him and also made comments about my muscular legs. I had a girlfriend at the time and never thought about cock but used to give him a big smile and have a few words, harmless fun. One morning as i was delivering a parcel he let it be known that he was in a round about way into spanking and was i looking to end a little extra cash........i said nothing, but gave him a smile on went on my way. Three days later, it was a a Friday, i was finishing my second delivery of the day and made sure that his street was at the end of my route. As i approached his door, he must have always looked out from behind the net curtains to see me coming, i could feel my cock getting hard and it was going to be very difficult to hid the bulge in my shorts! As i walked up his garden path the front door was closed and i was a bit relived to tell the truth but as i pushed the letter though the door opened at the same time. He took his mail and his eyes went to my crotch at the same time, his eyes appeared to light up and he asked me if i would come in for a few moments. I just went with the situation but pulled my bag across me to hid my even harder cock. Once inside, he just directed me to the front room and just said ' It looks very big, can i have a look at it?' I didn't have any words and just dropped my empty bag on the floor and made a move to unfasten my belt. 'Let me' he said. He dropped to his knees and and undid my belt and slowly unzipped me.My mouth was dry by this time but as he reached in and pulled my hard cock out from my briefs i felt so horny. ' What a lovely piece of meat, what can i do?' I managed to blurt out that i had never been with a man before and at this his eyes lit up. Before anything could be said, he wrapped his hot mouth around my cock and slowly began to suck my 7 inches. It felt fantastic and dirty at the same time as he reached round and grabbed my toned arse cheeks and sucked harder and faster. My shorts were down around my ankles and he then took his hands from my arse and moved up beneath my Post Office shirt and began to gently squeeze my nipples. I was in heaven with this dirty old man sucking my cock but at the same time i was a little sacred because i thought that he might want to bend me over and fuck me. By now i had my hands on his head and i was fucking his mouth, i knew that i was about to cum and told him so, he sucked me even harder and a few moments later i filled his mouth with my cum. He stayed clamped to my cock as my orgasm ripped though me and my legs started to shake, i felt so fucking dirty as he pulled away and he had a little bit of cum on the side of his mouth. He took a hankie from his pocket, cleaned me up and gave me a kiss on the cheek. I pulled my shorts up and nearly ran from the house. 'See you again sometime?' I had a big grin on my face all the way home and spent the evening wanking and thinking about sucking his cock. 20 years later, i never did get to suck cock but that particular memory always gets me horny.