It was a younger guy MC, I think with lighter hair, who lost his job and was maybe about to be homeless. And he was walking down the road and said something along the lines of “Well, I might as well try screwing a man since nothing else has gone right.” And some older, possibly dark haired guy, popped up and offered to pay MC to make porn with him.
I can’t remember anything else, but I’m like, 90% sure it was a black and white manga, not a manhwa.