I think cuckolding is pretty specifically tied to being excluded while a man is with your female partner within a hetero relationship. What you’re describing is definitely cuck adjacent, but probably has a different term when you move away from the cis/het roles?
Then you, and this is just my opinion, are lucky guy………. Why out a label on it? If this is what you all enjoy, it’s not illegal and no one is getting hurt then don’t worry! Live and let live is my motto
Having said that it could be put down as a type of vouyerism
Cuck actually comes from the word cuckoo!..…… because the cuckoo lays its eggs in a different nest to its own and lets the other bird incubate and bring up its young! Not entirely sure how this translates to how we know it in this scenario …… but there’s a little useless trivia for you