Hey Xagrim, may I suggest adding a few sexual interactions with Lisa(in Chapter 1) when you have max corruption and relationship such as hugging her when 60-100% arousal and her with 3 scenes depicting the boner FP, Third person and another scene where his penis is popping out of his pants pressed on her ass while hugging her! And have Lisa have be thinking to herself some sexual things about how she can feel his fathers boner and how that makes her horny! And 2 more scenes where she says(outloud to her dad)something like: "You sure are "happy" to see me Dad*giggle*" and the Dad replying! Put that on the first chapter and I will plead 120$ ! Add a few dreams of Lisa and have the option to masturbate(in the bath) to either his wife or Lisa and add 3-5 different scenes of them naked in poses while he masturbates! Or add some other sexual things that you can think of with Lisa in the first chapter that DON'T cross the line of actually having physical sex(handjob,blowjob,vaginal,anal) and just teasing seeing her naked, her seeing his boner etc! Add something to the massages with Lisa like him popping out his penis while massaging her and ending the scene with him masturbating in the bathroom!
PS: Work on improving your animation and cumshots otherwise the story and game are 10/10! You will be the first pornographic videogame developer that I will support by giving money because I am too invested in the story!