Agree.Discreetly ask the FA. I'm sure sure you'll accept the answer graciously no matter whether approved or not.
I don't think the lounge area is well used so it should be ok.
And ask first.when you ask the FA
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But a no means no.Thanks
One additional thing - when you ask the CSM, you may like to specify a time limit on your guest’s time up front. I recall now the only time I asked for someone to come up from economy to sit with me in business - two friends. I mentioned to CSM that it would be after the meal service has been cleared away and they would return before next meal service or whenever the CSM indicated that should return . He actually smiled and said well done that last bit makes it good to go and I’ll let you know when they need to return.