There is a considerable age gap between two nations, and this turns out to be a turn on for one of them, or for both.
The two can already be in a sexual relationship with each other and bring that kink into the bedroom, or to not be together and one or both of them lusting over all the possibilities.
Perhaps the younger guy/girl wants to be referred to as a kid, to be pampered, or spanked. Or humiliation turns on the older one on and he/she wants to be seen as an authority/parental figure.
A few ideal choices would be older nations such as China, Turkey, Rome, Japan and much younger ones like America, Canada, Hong Kong, Australia, Seychelles... But other more 'common' combinations (e.g England/America) are just as good, as long as the age difference is the main theme.
Any/Any - Age difference as kink
The two can already be in a sexual relationship with each other and bring that kink into the bedroom, or to not be together and one or both of them lusting over all the possibilities.
Perhaps the younger guy/girl wants to be referred to as a kid, to be pampered, or spanked. Or humiliation turns on the older one on and he/she wants to be seen as an authority/parental figure.
A few ideal choices would be older nations such as China, Turkey, Rome, Japan and much younger ones like America, Canada, Hong Kong, Australia, Seychelles... But other more 'common' combinations (e.g England/America) are just as good, as long as the age difference is the main theme.