Watersport

Hello sam, its me Ryan again
Thanks for previous advice
I have been with another master for a short period and once he forced me for watersport and i had to drink his piss, though i didnt agree first he forced me to do it. After i did i was bit disgusted and told him im not comfortable. He didnt try after that session. Now after few months im really craving to do it and get trained and im so scared to ask him to do again. How should i proceed or give him a hint that im ready to do it and get trained withour affecting our regular meet-ups
Is it going to be a weird situation that i denied once?