TL;DR: Download for the sex scenes and skip through everything else. It's not even remotely worth reading through otherwise. Better yet, just go on exhentai and find some NTR on there, this is barely worth anybody's time.
Edit for the winter season update: More of the same shit mostly. Just swap Mom for Childhood friend and there you go. It's insane how fast their entire personalities change, honestly. This isn't how real people act. I'll give props for having a pretty vanilla and wholesome route with the childhood friend but the first season is just straight up NTR, and it has to happen if you want this route. Just seems like a waste of effort honestly.
I'm usually pretty critical of NTR plots(because god fucking damn they're basically all the same thing) but this "game" seriously makes almost any other NTR plot look like Shakespearean in comparison. I put game in quotes because this is basically just a kinetic novel. There aren't any real choices, and there's no gameplay, you just click your way through the story.
Now onto the story. This is going to be like 5 seconds long because there basically isn't any. Your mom invites your bully over to the house so she can try and talk things out with him. He coerces her into sex and midway through that one sex session, she is already asking him to knock her up. I repeat, your "mother" wants to get impregnated by your bully about 2 hours after meeting him.
That is not what a mother does unless she is some cracked out addict living in the ghetto that only had you as a mistake. This woman is not that.
But that's basically what she becomes by the end of the content sooooo, maybe it fits? Who fucking knows. MC is as dense as a black hole(it's worse than most other NTR works) and for some reason interprets his mother moaning in her room while talking to him as her getting ready for bed. And when the MC actually does realize and call her the whore that she is, she throws a temper tantrum and MC pussies out from the conflict. Then she goes to live with the bully and act like you're not her son that she birthed and cared for for 15 years.
That's it. That's the whole story. She becomes addicted to sex with your bully on the first night and can never reject his advances. God NTR works seriously have the most contrived plots on the face of the planet, man. I really wish I could actually say more but that's literally all there is in terms of story. Seems like there's going to be some childhood friend content in some way or another but I'm sure it'll be just as half baked as the existing story.
I feel bad for the VA honestly. She absolutely fucking CARRIES the entire game on her shoulders. Does a fantastic job throughout and really elevates the experience. Her, and the art being actually pretty damn good are the only reasons this is getting more than 1 star.