Geez, here I thought that despite this revelation, Lavi would instead cut ties with his crazy sister and get suppressed, then somehow make a comeback (I believe the author is more than capable of writing it). Well, I understand his sister is OP, but running to his bedroom like a little kid despite everything he's been through feels like a "reset button" in his progress.
It would be more interesting if he had stabbed her, cursed at her, bitted her, or lied saying he and Filo will marry because she's pregnant (mental damage over 9000!). Pretty much anything is better than having everyone come to his doorstep and invoke
discourse no Jutsu for Lavi to be able to fight against his sister.
Nevertheless, this development doesn't diminish the overall value of the story; it's just my arbitrary expectation. I'm hoping for his comeback to be great and that he can gain some power ups (at least, having his powers back without the shackles) to combo with Filo's "apparatus."
Thank you so much for the translation!