I'm looking for a game where the MC goes to live with his ex-stepmother after his house burns down. he also has a redhead half-sister and has sex with her psychologist and her friend.
Are you sure it's after his house burns down? That setting is highly specific and I don't think there is one like that. But there is one where you move in with your step-mom and redhead half sister while also going to a therapist. Bad Memories