Summary:

“Mm, precisely. That means my rival’s one step ahead of me.” Akechi’s lips settled on Ren’s neck, setting his skin ablaze in the shape of his words. “But I’ll never let you win.”
//
Ren knows exactly who Akechi is.

A longform exploration of P5R if Ren (and only Ren) figured things out a whole lot sooner.