Once again. Went from being a full blown retard, to a sinister scheming rapist.
"Hehehe" REALLY?
Hopefully I'll stop reading this here. Just upset with it now. Even going further into character psyche, the mother started this because she's thirsty because apparently her husband doesn't have sex with her. Further confused because the husband is very unfit, and based on small details from commenters + story. He seems to be having sex with escorts or co-workers.
I suppose it's the human condition of greed for things you don't have, while neglecting what's already yours. The wife is obviously very sexy. It'd be more understandable if he was fit and she let herself go.
Koikun's comment below mine seems to point in a rough direction.