Honestly, I found Elin jealousy annoying this update. It's like jeez, I already fucked you and you're pregnant. Why are you hassling my extremely pregnant wife for? Legit just telling on herself and trying to expose everything. Making just about everyone uncomfortable at the table. I actually felt a bit bad for Lockhart.
I don't even find that kind of thing hot as well. That's why I had no issue with Isis behavior there. Because Elin was going too far. Now Isis caught wind of her when she would've likely ignored the entire thing. And let's be real, Isis would've caught on regardless of Elin actions here. But she wouldn't have said shit and kept it to herself.
If I only had one playthrough and Elin kept doing this in future updates. I would probably just outright avoid her romance. Because she's legit trying to ruin stuff. It was shocking how well Sera and Isis got along with each other. Giving me the idea of actually making Isis be the wife on my main route. Since the only reason I didn't was because I thought Isis might clash with our family a bit. Along with the killing of any bastards that threaten our children position thing. My Elis fucking a lot of higher class women obviously being an issue. But it was Elin herself who ended up being the problem.
And the thing is. After this update, there's very little doubt in my mind that Isis likely would be able to compromise on the incest. We now know Elis will only have girls with Sera and Elin. None of them having a claim to the throne. It would've slightly been an issue if Sera had a boy. Because if the King chose it as heir instead to spite him for fucking Sera, Elis would lose his position. And thus Isis children would also lose theirs. But with daughters, there's no issue.