Many many years ago I went to see a SP on my birthday. She was obviously high but we had a great session, and I capped it off by cumming on her face (at her request). After I came, I said "that's a great way to spend my birthday." The SP tells me to get cleaned up and get dressed.
As I'm about to leave, she puts the money I paid her back in my hand and says "I wouldn't feel right about charging the birthday boy to have a good time." She then says take the stairs down and get off the property ASAP.
5 minutes after I get off the property, I get a phone call from her boyfriend/pimp, and he is irate and yelling how I ripped her off. I laughed and told him to fuck off and then blocked the number.