Hentai like this really feel like a way to teach a lesson to people with a interest in that shit. Don't make your GF go with another dude even once as the chances of losing her forever is just that high. But personally I think that any man with a woman, not even a good woman, that is into getting cucked have a broken brain, no matter if they realize it after or not.
The hentai with the cuck realizing that shit is not his kink are equally pathetic to the ones with the guys just standng and watching their wife getting railed.