what fucking ntr? elf princess or queen aren't mc's lis and mc helping him gives points (not points actually but still good graces) towards them and might be relevant later and he has no any chance to get into mc's castle and isabella for sure won't fuck him.
Well, technically, Enainia (the Elf princess) was set as MC's LI since Act 1, and still is one of LIs (she even has her own Love Points & Corruptions Points like the other LIs).
It's just that the devs got around to getting to her storyline late compared to other LIs.
But even with that being the case, it really baffles me how one would jump to the immediate thought of being NTRed by helping her brother (in Enainia's case), and son (in Queen Lufina's case).
In fact, more reasonable thought would be their Love points would increase by helping the elf prince (well, at least, in Enainia's case, I think it would. Lufina doesn't seem to have stats variable like her daughter. But I'd definitely see it as something more positive than negative lol).