Choose any of the below that appeal to you or comment with other non-vanilla relationships. I do not consider same or matching sex relationships kinky in and of themselves, since that ultimately reduces them to sexual fantasies and fetishes. Which is why they are not in the list below. However, they will be their own post later, so I can ask about them divorced from implications of kink.
This is also my stance on interracial and interspecies relationships. I am sure many would say getting hot at the thought of big black cock or being smothered by a pudgy slime is being fetish minded, but I feel like the real infatuation is actually the size and weight difference aspects of those scenes. Those things are in the list.