The sigils. FUCK. He'd been so engrossed on pulling out as many stops as he had to try and basically flip the double birds and call out the Green Knight, that he neglected the connection that the double- and by extension she- would have had a little peek at that, enough for a recollection.

His heart raced. He couldn't say, 'Why? What are you talking about?' Not after everything. He'd messed up and dropped so much so far that it was any wonder he'd kept anything he had under wraps this long.

But she knew the importance of names. She, more than anyone, he'd say.

"...Yes. The sigil, and the name, are mine." There was no undoing what she'd seen.

"I am Lucifer."