Ok, well, first things first, it's a bit too short to say how the story feels or where it's heading.
Next point, you say this is your first game, well, it's nothing new, just another blackmail/corruption novel, ugly old dude corrupts/blackmails hot young wife, these kinds of novels are everywhere, and they are all the same.
Why could you not have thought of something different?? Do something no one else has done. You could have made the Husband's boss a female, and maybe not so old.
You'd be surprised how many people on here are actually into Lesbian AVN's, they may be less vocal than those perverts who like to jerk off to Blackmail/corruption slut making novels, but they're big on supporting good stories.
How will this novel continue?? Are you going to move to a more linear novel, or will you have lots of choices to make throughout the whole novel?? Will you force the main FMC into sexual activities??
Unfortunately, these female slut creating novels are not my cup of tea, especially when it's males doing the corrupting/Blackmailing and stealing a wife, but i wish you luck on your endeavor.