i'd lie if i say i don't love this. you can say all you want but this is the best ntr i ever read, and also the actual fact i hate straight smut or romance.
So the husband is insecure huh? he tried to make nakajima as his wife sexually compatible partner but still with his permission as her husband. the wrong thing is, this called deceive and trap for wife if it happens not with her consent. i think the wine with three glass means she already accept nakajima and his husband.
this is my point of view tho.
Tsukiyo no Midare Zake