Comment by Yujihanamakun on Reincarnated as the lazy and villainous noble, I broke the scenario and became the most formidable with extraordinary magic - Chapter 4

Ntr is not applicable here 
Because ntr require two people in love with each other and third person come in between 
But since they never meet it not ntr 
And maid misunderstand more than necessary 
And girl beside black haired original mc might be turnout more