Don't ask me why, but I was looking around for a taboo-focused erotic visual novel game to play, and I found this in on Porn Games Hub. I know this is a sensitive subject to even ask, but were the characters originally intended to be written as related by blood? I know you can choose their relationships to be whatever you want, but just the way the maid and neighbor treat the playable character comes off as very motherly and divorced auntie makes me want to ask.
I don't speak for the developer but due to legal reasons and for the benefit for the audience you can choose the relation between the player character and the women. However, the dialogue, overall situation and behaviour hint heavily at the characters being directly related in some way. (With Linda being the (step-)mom, Emily the (step-)sister and Julie the aunt)