Mercy Suck Yesterday

This guy responded to my ad looking for a host that wanted a blow job, he was completely honest about his weight, four hundred thirty pounds he told me but he was working on it. Three years or so since the last time he had a blow job or any other sexual contact, could not bring himself to pay a prostitute but would be very grateful for a blow job if I was willing to do it.
I showed up after telling him he better be fresh out of the shower and would probably have to lay down for it, his cock was a decent size, probably six inches hard and he was only in his early thirties so still getting a good erection. Balls sack blended in with his fat but his ejaculation tasted pretty good so I sucked him to another one. When I stood up he thanked me like five times then said he would do it to me if I wanted it, he had never sucked a guy off but that is how thankful he was for me doing this for him. I told him Okay, sounds great and we walked out to the living room for him to sit in a chair for it, I came and he swallowed, sucked on me for a minute or so afterwards and told me that was not bad at all. I told him this was fun and left, I checked my messages this morning and he asked me to come back again because yesterday was amazing to him. Not sure I want to do it.