If I was her husband I would let her have all the beautiful young cock she wanted, as long as I could watch. A wife is never so desirable as when she opens her legs and desire to another man.
Our friend would have been a good fit because he had a good rapport with my wife. Admittedly it might have been awkward being around him afterwards knowing he had been with my wife.
Bummer. There is always opportunities though, I would rather she/we choose a stranger or someone we run into on occasion rather than a friend, and see if she can make it happen!
My wife and I had this good friend named Steve who I knew was well endowed. I told her years later about him being big and asked her if I had tried to hook them up would she have fucked him. She told me yes and I kick myself for not thinking about it back then because I would have loved seeing her cry out as he was fucking her.