"Isn't it okay to have a game like this?"
Ntr haters: No!
(usually) NTR hater here: Yes! Unless the given images and story setup explanation are being deliberately misused to make it seem so when it's not, it's optional corruption; you have to let yourself go and choose to 'cheat' (on her heart, at least, since they aren't formally a couple), or do the wrong things and thus not be able to maintain purity of will through demonic influence and be made to fall. That's perfectly fine. Too many NTR games are just, "I'm happily married and have two kids and a husband that fucks me every day, but whoops, I fell into your lap, now gimme your dick, I haven't sucked one in 15 minutes" or "Hey, I have blackmail of you and your fiancee kissing!" "What? oh no, I must debase myself fucking you and servicing you sexually for a whole month (or several months) just to keep you quiet!" Stupid, illogical scenarios that make no sense even in a porno world setup, unless the one being stolen away had no attachment to the original guy in the first place, in which case- that can be just as easily shown, too (and when it is, it can be satisfying; The hentai series, "
Wild Method – How to
Steal a Japanese
Housewife" does this exceptionally well. They are NTR stories but with a netori cast to them because of there being a logical setup of neglect and the ones doing the stealing, even though they're the ones in the wrong legally, culturally, are still doing the housewives a good turn by getting them out of shitty situations... and giving them lots of hardcore sex, too).