Fat kink
One of the most important elements to my kink fantasies is someone giving me the impression that they are not only enjoying it, but reveling in it. To that end, one of my favorite scenarios for roleplay is one where the 'dom' in a scene is giving way to some form of corruption, becoming more intense and lust driven. Double points for physical changes and magical powers coming with this corruption.
Fat kink
Me getting huge is a focal point in that it can't be absent from a scene. If it is, I just.. can't enjoy it. But if that is happening, then just watching my partner slip into depravity over their desire to cause that becomes one of my most powerful buttons.