I'd like to give it a shot with my thought on this.
Before you ask, no i don't think every route 100% will have NTR and maybe you're right and the other routes are without NTR. I'll do just a lot of thinking around the corners now, as some people might say.
- Route A - Hell/Abuse: Irene absolutely hates Sam with all her guts and swore that she will make his life a living hell. There might be a chance for him to fight back in this route.
This could imply that she'll fuck with other men just to make him suffer. Maybe with the potencial for MC to flip the cards at some point for some sweet revenge, like kinda late into this route showing her that MC is happy with other women and robbing her of the nice satisfaction/feeling of having the upper hand over MC. Maybe even with a late branching into either a netori kinda plot with maledom potencial or a possible rejection route for Irene to make her suffer even more
Honestly, that... sounds kinda nice i think. Could get good maybe ngl.
- Route B - Submission: Sam realize just how fucked up the thing he did was that he completely surrenders to Irene, Irene on the other hand is entirely willing to give him the proper punishment (and more).
To be direct, it sounds like the usual "whimp" MC story. Irene fucks another Bull to punish MC while he can't get his balls straight to do anything.
- Route C - Corruption: Irene blames herself for what happened, and in that moment of weakness Sam took advantage, his goal is to manipulate her into the woman from his fucked up fantasies.
Seems like MC will use the leverage over Irene to fullfill his "fucked up fantasies" of seeing Irene fucked by someone else. So a Netorase kind of plot.
- Route D - 'Love': They both blame each other, trying their best to gather everything back to normal, along the way something akin to love starts to blossom... before someone else decided to put his hand on it. I consider it the Classic NTR route.
Route D is self explanatory i'd say. I always find it
funny if devs put Love or "love" in their NTR route somehow, views may differ on that i know. To everyone their own.
Yeah that are my thoughts on this. I'll keep my eye on this until i know more about how this will go in the end.