There's not really non con (though there is dub con, as the mc does emotionally pressure the ml into sex for their first time). The issue is that in today's context, the mc would essentially be a groomer, at least if you look at his actions alone and disregard his backstory/the whole plot. It's not a bad read though, at least the weirdness is somewhat addressed. They grow together and it's a slowburn in terms of mutual romance. It's definitely something different within the genre.
Mild content spoiler about the grooming backstory, don't read if you don't want to be spoiled:
The context is that mc is immortal and finds the reincarnation of his dead lover when he's a child, and is a close uncle figure, until he's of age. And then things get complicated.

Is this worth a read? Asking as someone who doesn’t want to read non-con / sa (〜 ̄△ ̄)〜