I really don't do socionics much, so I asked the OP if I could do a JCF according to SfP version. Here it goes.
There are two distinct places in the world, Fe space and Fi space.
Fi space was described to me by PB as the place inside Fi users, deep down, where feelings occur, invisible to the world. It is a bad paraphrase, so sorry, but it how I explain it for myself.
Fe space, coined by me, is the emotional and ethical space between people, the realm of human interaction.
Everyone has Fi space inside and everyone lives in Fe space, but Fi users primarily feel ethics, values, and such internally, while Fe users' Fi space is generally unconscious.
A nice example of Fe space is driving on the freeway. There are rules(Te) governing how drivers are to operate their cars, but how they actually do it is in Fe space. The merging, the tailgating, the lane changing, etc. by the drivers is a Fe system in action.
As Fe dom, I feel directly connected to the emotional state of people with which I interact. There is no self reflecting on observed emotional states of others to determine what I would feel if I were them. I just do. And I can push emotional states on others with out much effort, or even after at all
From my understanding, again per PB, directly connecting to the emotional state of Fi users can feel like a violation of their Fi island. Of course, the Fi island is really a peninsula, but acknowledging that, accepting that Fi space is connected to Fe space, is difficult for FPs.
To me, strong Fi feels like a giant pilar of light in the Fe space. It is beautiful and alluring. It pulls at me, against my conscious desires.
I believe it does so because (following the 8 function model, in a way), the shadow of the dom is a strong pull, more so than the inferior. And I believe growth really is, if a person is willing to fit through the pain, seeking the shadow of the dom and developing it.
A Fe dom can sit with their feelings and try to explore Fi space. Likewise, a Fi dom can open themselves to Fe space. Both will be painful.