And you blackmail her for what exactly? For using!
There is only 2 options for FarmMalePC: coerce her into servicing you or make her quit.
If latter is chosen than you'll have no scenes in ActI. But in ActII you'll have new choice: an option to basically become her fuckbuddy (consensual, three scene variants, chosen at random each time you visit, need some time between visits), tell her to return to brothel, find some mate or don't bother.
If former is chosen she will wait for you at her house. There you can "use" her (dub-con, three variants, chosen by you each time you visit, need some time between visits). If you "use" her enough times (and not be rude to her, IIRC), she will become more willing to be "used" and scenes will change a bit (con with a bit of dub-con, three sub-variants of former scenes, no "cooldown" between scenes).
So, both options can lead to sex with her, though on different terms. Having sex with her, in turn, opens a path for another few scenes later on.
If you are into this, FarmMalePC is a gold mine.
For FarmFemPC there are another 2 options: become a prostitute to work with her or make her quit. Former will lead to sex scene with few variants and the latter... I dunno, actually, if chosing the latter option could lead to sex with her. Though I think there would be some mother/daughter lesbian scenes later on if you choose brothel option.
Hope I'm of any help.