Your welcome, I like the part where you only name the character as their role in the game, like the MC, Step mom, step sis, and childhood friend, you give as players a chance to name those character. Also when will the Intercourse scene will happen, also will you make romantic scenes like the MC and his lover(s) waking from bed and kiss.
I have this backstory I thought about the step mom to why she's being seductive to the Mc, in her first marriage her husband only like her appearance not her personality and when he found another women hotter than her, he left her, and the MC's dad marries her cause she hot but eventually they got divorced cause it turns out they don't have the spark of romance, but the MC is different than her previous Husband's, sure he see her hot but tries to be more gentleman around her and he easy blush by her, that spark a romance with the MC, what do you think this simple my headcanon if the step mother, its up to you if you found this idea fun or simple enjoyable to read but will not be part of the game or maybe inspired something you haven't thought before, anyway good luck in making this game. And take care of yourself.