This story is from when I was in my early 20s, didn't have a car so did a lot of hitchhiking (wasn't quite as scary back then) and bumming rides from friends.
One night I was out on the town with friends and needed a ride home, about 20 miles away, none of my friends could accommodate so I started hitchhiking. After a bunch of cars passing, a tractor trailer cab stopped and asked where I was headed, I said where and he said hop in.
This was the biggest truck cab I had been in or seen, we chatted and he told me he was a long hauler and was on the road alot so this was his home away from home. We made small talk and I noticed he had some magazines in his truck, was shocked when I saw they were gay mags. He noticed and said he hoped that didn't upset me, I said no, the conversation quickly switched to sex.
He asked if I had ever had my cock sucked, I told him yes by some women, he then interjected and said how about a man, I said never. He told me he would suck me off if I would like, I was somewhat leery but it actually appealed to me and I began to get hard thinking about it. He put his hand on my leg and I got very hard, he said we will pull into the truck stop and I will take care of that for you, I was now game.