Can something be a kink if it’s only happened once

I got chatting to a couple a few months back, and the husband turned out to be a bit of a cuck.

Cutting a long story short, I ended up sending them a picture of my cock and the husband took a photo the wife holding my cock between her tits. It’s was amazing and made me cum so fast.

I’ve never had this happen to me before, or since, but I think it’s a kink I’m now into? Can it be a kink if it’s only happened once?

Hopefully one day it’ll happen again!!