So I played Eternum, and I have to agree: I'd easily play this without the porn. I'm seriously impressed with how well this story is told.
In terms of plot and narrative, I think one thing I'm particularly impressed by is how Caribdis clearly listened to feedback on Once In a Lifetime. In that game, the MC's father was just... there. He was a decent antagonist, and the backstory was solid, but he just didn't really evoke much in the way of personal animosity.
Not so with Eternum. Consider the scene with Alexandra and her dad. Just excellent writing; it showed this raw, ugly and uncomfortable situation and absolutely sold it. It made me feel for Alexandra, and I think it wouldn't have worked half as well without her particular characterization and the relationship she'd built with the player character.
More to the point, that scene gave me an emotional stake in wanting to see William Bardot fail. If I hadn't been invested before that point, now I am.
I really like how characters are all allowed to be complex and flawed. Like Nancy. That scene where she basically conned her friend into selling her an implant was legitimately hilarious. Or like Annie, who was obviously terrified by the detective world but still gamely soldiered on.
Strong characterization, internal conflict, and a plot which is heading somewhere with purpose. Truly great stuff.