Good story. Being an ex nudist photographer among other things, I can relate. I personally would have enjoyed the story more if the husband had gone back in and be shocked to see his 'innocent' wife taking and enjoying some strange big Hispanic cock.
You said the guy grabbed his crotch when you walked in. I have seen Mexican guys do that a lot. I took my first wife, a gorgeous blonde to Juarez Mexico one time (it used to be a big deal to go there and get a steak dinner in those days) and as we walked along on a major tourist street, several guys grabbed their crotch as we walked by, while pretending not to know she was there.