Yes, it is very much possible to play it obedience only, I do it every time I play. The girls losing Love when you force them to do something through Obedience is exactly what you're saying that is not in the game. They go against what they want all the time, and as someone said a few pages ago, when they have high enough obedience and you penetrate them without their consent (which is rape) they just close their eyes and accept what is happening. If that's not "going against their own free will" I don't know what is.
This game is already very dark, and even the Love route is mostly abusive given the addiction thing. Adding any of my suggestions wouldn't be a stretch at all.
Actually just did some tests myself and you are right,it indeed seems to be possible(kinda...the game starts freaking out somewhat,not being able to make up its mind...reeks of questionable implementation of elements that arent supposed to collide like that).
90% of the time the girls would still outright refuse sexual interactions even with 1000 obedience and the master switch flipped.
Well anyway,I still highly doubt you will be seeing what you wish for(going by the general setup,breath of implemented content,past focus of added content as well as market viability)but hey,If im wrong good for you(and bad for Oni since it will further split his already small patreon base,hah).
I don't know about the other girls - and I'm waiting for the Jean version to get something approaching stable, so K probably - but if you keep being a complete asshole to Rogue so she hates you, and demanding various sexual favors for her touching you, she does hit a "I hate you, but I can't be without you because of this feeling" moment.
That absolutely reads of addiction, and puts the same tone on the rest of it.
And like pretty much all addicts, it's not really free will anymore, as they'll create any justification in their head to make themselves believe they're in control (I can quit any time I want, I just don't want to) even though they are absolutely not in control, and not acting in free will.
Hah yes it does actually read like that(with really downplayed minor withdrawal symptoms though,possibly purposefully skewering the tone,giving it a much more light hearted vibe than normally associated with said themes).
Will be ineteresting to see what he does with Jean since she does throw the prior approach out of the window(shower encounter was great though,even if I was utterly confused about not being flashed).