No. The plan was to wait until both sides were in the middle of their DragonballZ style kamehameha-fest in chapter 1, take advantage of their preoccupation and kill both of them in one go. The problem was that Naga and Anastasia's ultimate magic powerscaling battle caused that big explosion that...
It's not like they didn't take precautions either. They were moving to different towns every 5 years.
They just got real unlucky because Connie just happened to move into the village they were currently staying at and met the two kids by pure chance.
"But you just have to sit down"
Thank god a manga finally said this! Every single time it's "Oh shit, how do I go to the bathroom as a girl!?"
Dude, you just fucking sit down! Have you never sat down at a toilet before? Do you shit standing up too!?
@TNT261
Most of the comments I read on boards have people relating to the guy doing the corrupting or stealing. I'm sure there's some who get off on the lover interest getting stolen angle, but most seem to just like NTR the same way they like straight rape/corruption manga.