I don't really see anything that offensive with this, it doesn't do anything that's really out there or beyond the pale, I get why some dislike the premise but I think it does it in a way that doesn't just have the mc cave immediately (and therefore actually follows through with the concept) without him being a dick.
I kinda love the way sex is depicted in this. Instead of using sex for general eroticism, they use it to further add to the disturbing and downright evil atmosphere. There were no scenes that could be described as pleasant, they all had an underlying unsettling feeling to them but you couldn't look away no matter the repulsion.
This just feels gross, this feels like Twitter art that some big animator on YouTube drew years ago and is now resurfacing in the midst of grooming allegations. And mind you, I liked Suicide Boy (minus the questionable fan service)