Hard NTR, as I understand it, is if everything ends in tragedy and tears, the bond between "the protagonist" and "the girl" is broken and he loses the girl in some significant way. Basically, what the sports fans try to do with Cynthia when they go "look how much better our cocks are than your boyfriend's, become ours forever", which Cynthia in turn shuts down hard (which in turn amuses me way too much for a sex scene).
If the "tragedy and tears" is the only thing you're looking for... yes, I'd assume you're better off looking elsewhere.
If instead what you were here for is Cynthia sleeping with everything pleasing like the... connoisseur of the adult joys she is, as she's been doing so far... I expect there's more to come in the future and you may want to consider sticking around. Just don't be disappointed if she keeps up a healthy, solid relationship with Sergil while she does it.