Two or three times a year, you and your wife and her sister and her sister's husband go away on vacations together. Your wife and her sister always have a LOT of sex on these vacations -- always involving cuckolding the two of you. It was really awkward for you and him the first few times, but you're basically used to it now, and you even sometimes talk about it with him -- about how you both took a while to learn to deal with it emotionally and how you now have gotten to the point where you really hope that the two of them are having a good time.
Based on another true event. My wife had a good friend who I will call "Karen". She and my wife had been close friends in college and were in the same sorority. Karen was really attractive and had a fun personality, but her husband was kind of a jerk so we didn't socialize with them much as couples. However, they eventually got divorced and after that Karen went through a bit of a "wild phase" where she dated and (I assume) slept with a lot of guys. She would frequently ask my wife to go drinking and dancing with her which my wife occasionally did. When they would go out my wife would play the role "wing woman" for Karen. At that time my wife knew all about my cuckold fantasies and we had talked about them quite a bit. I always encouraged my wife to have fun and let her know she could do whatever she wanted. She did enjoy meeting, flirting, dancing and on a couple occasions kissing with other guys, but she never went further than that.
Your wife is right -- even though she had been trying to be somewhat discreet about dating other men, it really was inevitable that at some point your friends would find out that she cuckolds you, and now that the cat is out of the bag about that, there doesn't seem to be any good reason why she shouldn't start dating your friends.
#queued
That’s the same deal I gave my wife. It’s totally up to her now.