I am all for being considerate and have moved countless times for the same reason (though was never snug as a bug in a rug in First but more like tight as a sardine in a squashed can in coach )but unless they were, say, on their honeymoon, for example, I think you went above and beyond Premex. Still good for you for being so generous, not enough of that considerate attitude going around these days (FT excepted ofcourse ). Next time, in a similar situation, maybe the couple could sit in the bulkhead seats together (I assume there are two of them) and the bulk head pax can sit in their more comfy chair.