IN WESTERN culture, and the English language, NTR, or Netorare, is synonymous with Cuckolding, which in turn, is commonly, in modern sexual fetishism, seen as meaning in the presence of the Cuck... that is, watching his partner taken by another.
In Japanese culture, it is describing where a character's lover or partner is seduced by someone else, leading to themes of betrayal, jealousy, and heartbreak.
The Hooker is NOT the MC's Lover, or Partner, or Wife, just someone he felt sorry for, and had sex with once... I do not class that as 'Lover' or 'Partner'.... and he is not present when she works, watching, and she is NOT SEDUCED by ANYONE, it is TRANSACTIONAL, she offers her body for MONEY.
IN NO WAY is this Arc NTR, You are only right in saying it is not up for debate. It is not, you are wrong, simple as that.
I am not a cuck, or a simp, I am just mature enough to understand most of the time, you are NEVER the first man to fuck any woman you sleep with, and most of the time, until you are in an expressly committed relationship, mutually agreed upon... she is likely fucking someone else too.
THAT is reality.
The implication of women being property in your position, is terrifying. I bet you think YOU OWN THEM once they fuck you once right?
Take a walk snowflake, what a fucking sissy prissy little wimp you are.