The old man with the huge helmet pt1

I first men him in a public toilet - I was stood at the urinals in a town center toilet and he came down the stairs. In his late 50s with a face that said he was after bigger sleaze than just wanks. He went into the end cubicle and shortly after I followed him and headed to the next stall. His foot clearly visible on my side of the divide was, it seemed, seeking a response. Naturally I put my shoe alongside his and he gave it a couple of nudges. I dropped my trousers and pants and got my young hard cock close enough to the bottom of the divide for him to be able to grab it. He could see I was in position as my knees were just under his side and within seconds his hand came through to roughly explore me. He felt the length of my prick before bending it down - making my hole gape open. He squeezed my balls firmly - I knew who the boss was. He got into the same position I had done and I reached under the wall to feel his mature cock. I fumbled around discovering he was cut and then my fingers came across his huge helmet. It felt enormous I had felt nothing like it. He dribbled some spit on it for me to stroke him. After just a few strokes we heard someone entering and so both got off the floor. I was peering through a gap in the door trying to work out who just come in and I somehow knew to turn round - there he was standing on the toilet obviously and looking over. I took a deep hit of poppers and gave him a show - exposing myself, first my cock (still rock hard) and then on his non verbal command and exposing my hairless hole. He told me to finger myself which I did and then ordered me to strip off completely. I had never done that before and the thrill was huge. He watched with a satisfied and cruel look on his face. He told me to slide my briefs under the wall which I did and stood on my toilet to look over to him. I was greeted by the site of him rubbing my pants over his cock - particularly the almost grotesquely big helmet - almost like it had two sections - one on each side. Very quickly within a few strokes I could tell he was gonna cum and in my underpants! Huge spurts shot out of his now purple headed cock and drenched my briefs - all the time he was mouthing filth to me silently. Without a word he slid my drenched cummy pants under the wall and he flushed and left - leaving me naked and hard. I quickly rubbed his cum all over my helmet shaft and balls and with another hit of poppers I was cumming too, leaving a puddle of white jizz on the floor.
That was the first time but there were many times to follow and each time we got freakier and freakier.....