I don't know that Leo wants to take on 10 billion years of history and Lucifer's mind is pretty immune to poking around in the first place. His Will would rebuff any attempt to 'take over' his eyes so that wouldn't work either.
That said, Leo could definitely pick up an aura of 'otherness' / 'angelic' / 'Hell' off Lucifer
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Okay, reading through this let me see.
I don't know that Leo wants to take on 10 billion years of history and Lucifer's mind is pretty immune to poking around in the first place. His Will would rebuff any attempt to 'take over' his eyes so that wouldn't work either.
That said, Leo could definitely pick up an aura of 'otherness' / 'angelic' / 'Hell' off Lucifer