If I don't want to do the Aiden Netorase path, do I lose access to corrupt path Catherine? Is it a simple romance path only if I turn down the NTR? Or do I lose access to Catherine's pathing completely? I searched in the thread and didn't really see a clear answer. Thanks in advance.
Aiden and cathrine are in a relationship currently. If you go corruption route for cathrine, which means blackmailing her into sex, you will cuck Aiden. If you go seduction route, you stay "friends", but given cathrine's thoughts about the mc, it's likely she's going to go for him at some point on her own, just not as fast as through the corruption route.
Generally in this game, it's not a strict division between corruption and love like in other games.Even in seduction route, mc is still clearly dominant, mc is still actively pursuing the LIs and actively changing how they think through his actions so that they eventually fall for him.
If you go the corruption route with cathrine, there's an additional "ntr" variable concerning aiden. You can choose to show him a lew picture of stephanie. Which in turn will result in the mc sending aiden additional lewd pictures claiming that they are of steph, but it's actually cathrine.
So basically the choices are:
Blackmail cathrine into sex, send aiden photos.
Blackmail cathrine into sex, don't send aiden photos.
Seduce cathrine, making her realize that mc is better than aiden at some point in the future.