I kinda wanted to fuck her the first chance you get but it ruins a relationship with christine so i've never done it since without the mod i usually play in a committed relationship with christine
Yeah if you're having an exclusive relationship with Christine then it messes things up for vanilla events if you fuck anyone else. I've started looking through what the vanilla game does with the different relationship status trackers to see what the best way to set up the friend path for my mod is. I do like the way dialog in the vanilla game has Christine, Jess, and Sonya all make appropriate comments about him banging other women including whether it makes them jealous, turned on, pissed off, etc. There are a few places where I will need to override some vanilla restrictions when friend > horny but less of them that I thought there would be.
I think what I'll end up having to do for the dialog later in the game to make sense is to add some restrictions to your relationship choices later so that you can only choose the (boyfriend) option if Christine doesn't know you fucked Jess. That way the vanilla dialog will automatically match up with whether you've been fucking Jess, Sonya, etc.
Too much of the mod is dependent on scenes with Jess for it to really be worth playing if you're going to be completely true to Christine. So if she watched you fuck Jess in a mod scene she will only allow the (fuckbuddy) option. Some of the scenes I have right now don't give you a choice so I'll add some extra options to get right up to the line without actually crossing it. Of course, where you draw the line might not be the same place that Christine does... I think it's ok if she knows you fucked Sonya on day 11 although she does make the occasional comment about it, still double checking that.
So for people normally playing the exclusive relationship path I'll put something in where she gets jealous but also turned on when she sees you doing things with Jess but will only let you take things so far depending on her corruption score before she gets pissed off and shuts you down. So with a max corruption score she might let you do just about anything to Jess short of actually fucking her while with a low score various levels of teasing will be too much for her. I will also make sure that the mod scenes where you fuck Jess can be kept a secret unless she actually witnessed it, but that will be dependent on Jess's corruption score and how much leverage you have over her. So she'll rat you out if you mess up.
I plan to do something similar for Jess as well. I'm thinking I may tweak things so that some of the best Christine scenes in the mod require an exclusive relationship with her (or at least that she remains unaware that you fucked Jess) and some of the best scenes with Jess require an open one. I want most scenes to be possible regardless which path you're on though. I don't want to have to spend too much time writing alternate dialog based on your relationship choice so I will just have the vanilla dialog handle that part and try to make sure that mine doesn't contradict it.
It will take me awhile to really figure out for sure what I'm going to do with that but I will have to at least start the process for the Spa scene I'm adding or the vanilla dialog will make no sense. I plan on waiting for the next version of the game to come out before I really dig in and start working on that since I will have to redo everything anyway to make sure it works in the new version.