Thing is that, wife is a pervert from the start. She has been trained by her father to become an ultimate sex bomb in order to use her body as much as possible. MC proposed wife even when he had suspicion that she is a whore, why you ask? Because he is a natural born cuck too! So this is a relationship between a woman who can fuck anyone in the world and MC with subpar dick along with a cuck fantasy. But they still love each other. Yeah she is being mad there but everything has been going as per her plan, she wanted love of MC and also sex from every other guy possible.
If you follow M2F story, MC even gave up being a man to help her realize her ambition. Eternal love from MC and a sexbuddy. She even plotted with MC's father to plan his transformation but it went beyond their control as they became soft when MC broke down. But wife's father had another plan, since another woman could come under his control he decided to train MC such that MC could do things he can't get his daughter to do. Yeah corruption is too forced there, this prison could have added smoothly after MC was introduced to new body properly but still not a completely illogical storyline.