You could have cucking without any emotional sadism or masochism, humiliation or degradation.
I could see a scenario where the cucking is done in a very loving way, perhaps as part of an extended chastity scene, with tease and denial, an expression of the domme's control over her subby boy, and an expression of the sub's devotion to his domme. The key to any scene or relatio ship is that it has to be healthy and good for all parties involved. Consent alone is a really low bar.
Fuck, I want see that scene now.
Edited at 2018/08/19 23:35:42