My husband loved to watch me with other guys, but wasn’t into humiliation (except from the other side, he did bull for some couples).
I think it’s the humiliation that makes it cuckolding kink, not whether it’s same sex/opposite sex. So yeah if you like them making fun of you for getting each other off better than you could, it’s cuckolding.
Without the humiliation, just voyeurism I would say. Same as if she liked seeing you get railed by some guy and enjoying it, but not feeling anything except happy about it.
That is honestly a great shot!