Pay in advance?

Episode why we want to pay in advance:
I do it by putting the money he gives me on the table so that we can both see it. Because they are not (fully) mine yet.
It is best to have all services agreed in advance so that the romance is not disturbed by objections that it costs five hundred extra ;D
If he is not sure, he puts more money on the table and we take the unused bills back.
The last experience I remember was that the gentleman paid for kissing and oral without. He was totally cool, he seemed trustworthy and the kind of person that you can get along with.
When it was nearing the end and I was smoking him down, chasing alternately and I already feel that it should be done, so I chase chase and he tells me to take him in my mouth, so I take him and he cums in my mouth.
Well, then after the shower, he starts to get dressed, I say, and five hundred for the cum in the mouth? But I don't have any money with me anymore.
I threw an angry look, nothing more, and he's probably used to it, probably not the first time.
He packed up his pile of things with shoes, left and kissed in the hallway normally in a block of flats 😀 Of course I gently closed the door behind him, like a fragile flower 😉
Yes, you might say to yourself, I got a lot of money for it even without the five hundred and what would the children in Africa give for it and here in Lidl they work for a hundred an hour so what would I want in addition, of course I realize that and I respect that, but on the other hand, it's just all dangerous, so that's where the extra fees come from, because you can get infected by kissing, oral sex, sperm in the mouth... (so of course we put it aside for sick leave ;D )
And just in principle, it is an extra service and the person has no right to do it without paying for it.

If someone shoves it in your ass, saying that they will pay for it later, but then they say shit, I'll pay you, isn't a double one enough for you? xD