It's worth noting that the first case, the one that all of Part 1 hinges on, is very clearly meant to be understood (eventually) as some sicko shit and Denji ultimately surrendering his free will to her in a proactive manner is unequivocally his lowest point, and it's clearly because of a combination of her grooming and her machinations to create and then destroy his positive relationships that he offers himself up in such a way.
I think the Reze is supposed to be his own age. Himeno you might be right about, but I think she doesn't actually find out his age until the morning after their aborted fling, at which point she lets it go.
spoiler
It's worth noting that the first case, the one that all of Part 1 hinges on, is very clearly meant to be understood (eventually) as some sicko shit and Denji ultimately surrendering his free will to her in a proactive manner is unequivocally his lowest point, and it's clearly because of a combination of her grooming and her machinations to create and then destroy his positive relationships that he offers himself up in such a way.
I think the Reze is supposed to be his own age. Himeno you might be right about, but I think she doesn't actually find out his age until the morning after their aborted fling, at which point she lets it go.