I wish they existed.
Western NTR is so awful it makes the entire genre reek like shit. It's hard to find one that isn't AWFUL.
Though there are a few. Mostly easy-going netorase, but Secret Care Café is solid. The art style is much less offensive to the eyes than most 3D, the writing is decent, the gameplay works. Nothing really fails there.
Eh.... Fleeting Iris is well executed, even if it doesn't appeal to me personally. Plenty of common NTR tropes done well for what it is, and if you like the common stuff then it's a good example of it. Super weak gameplay.
And now I've run dry on examples of good western NTR.
Usually, for western NTR, there's no gameplay(so it shouldn't be called a game), the writing is actually as bad as partially edited MTL, the characters are bad, the """art""" is so horrible that it would be immensely improved by being a text-based game, and really sucks to experience.