The moral of pt2 story with Denji, even pt1 also, is always that chasing fames and praises is bad, being CSM is bad, associating with anything devil is bad, BEING NORMAL BETTER. This can only means one thing, the endgame of Denji will definitely be to quit being CSM, quit being a hero, quit associating with anything devils and to settle with a normal girl, live a normal quiet life, and die a normal death. And ya know, Freckles character just perfectly fits all those criterion. Fuji is so obviously setting up Freckles as Denji's future normal wife. If you can't see this, then you can't read or didn't even read the manga. That's all