I totally agree with you about cucks, They're extremely selfish and it's all about themselves. I've never met or even heard of a woman who wants a cuckold husband. That's why I tell wannabe cucks to NEVER mention that word to their wives, nor even talk about what that means. I tell them to just be grateful that she agrees to be shared, but just leave it at that.
But I'm not really sold on compersion, either. If you make this all about her, then you're going to make her feel some level of guilt.
If you see your wife is liking this, then it's pretty obvious that she is. So this is where you let her know how much YOU like it, so that will make her feel like this isn't just about her, but about both of you.