This hasn't been in the series.
Based on the previous threads, it's my understanding that the NSFW Fanbox parallel work mentions this, but it's not reasonable to expect people reading this to necessarily even know of that series's existence, never mind be aware of the plot relevant details that...
"Irrelevant" seems harsh. They get stuff done. They're basically the reason all the other couples are proceeding so smoothly.
After all, we're watching the one couple they chose not to interfere in go to pieces right now.
It's true that the story is (has been?) mostly treating their...