Just recently finished your game, using this place to give some feedback/a review.
Harem games are either rather easy to pull off or complicated. Most devs choose the easy way out, using plot devices like mind control or 'corruption' to avoid dealing with character development.
The story of Harem games is always silly in regards to an overall plot. Character interaction is more important though. There needs to be a character in a Harem, that glues everyone together, if one wants to keep it somewhat believable or relatable.
In your case I think this character is Erica, my favorite for this one for this exact reason. She connects not only to the MC but to the other mothers, and even the girls, making the whole construct more stable. You did a good job creating your characters. Aside from Ronnie maybe.
The teacher is a good antagonist, creates drama without interfering in the Harem dynamic. Ronnie is poorly executed, since the player might feel helpless to counter his actions and the player does not get a real satisfactory victory against him . Would have been different if the person the player uses against him in the end, would have actually been portrayed as important to him beforehand.
Overall a good experience with a bit rushed ending. The harem and its members reasonings make sense for the most part (Wanda probably excluded, no idea why she would settle for this arrangement ) and the characters are interesting and lovable with their own quirks and personalities.