Just so you know, a stepmother would work, maybe in the next update coming in two weeks. The game is still in the BETA phase, so a lot can change!
I know it's beta, but when the sandbox mode starts, the prologue ends. Regarding relationships, you could let the player type in their own relationship details, like with names. And I think before the sandbox mode starts, you should maybe explain what it's all about. The only thing the player knows is that it might be an isekai story, that the main character belongs to a domina succubus, and that they got a horse tail from here. A little backstory would be good, for example, who the main character is (or really is). A little more information would be helpful; that's what an intro is for, after all. I'm not saying your game is bad; I just don't like sandbox modes—too much clicking for too little reward. (Translated with Google)
