Is everyone blind? The child is clearly a production of sexual abuse/rape of the distant ...

Is everyone blind? The child is clearly a production of sexual abuse/rape of the distant relative that took him in.
And why does this have this disgusting haremy vibes??? ヽ(`Д´)ﾉ
It was going GREAT and it was so fluffy and cute without the author bringing other girls into the equation.
Like why is it even necessary in this story. Like why? Am I doomed to never find a non harem manga with a male protagonist? Cause I swear so far I have not and when it turns like that I'm forced to drop it cause I cannot stand harems, or any form of cheating that they balantly and shamelessly do.
The way the girls shamelessly throw themselves at one guy just baffles me.
The guys who secretly enjoys it while apparently being "oblivious " to the harem cause he only like one person even though he has these "moments" with other girls in the harem, just disgusts me even more. Ugh. I'm so sick and tired of this trope and yet it's every-freaking-where!
(╯°Д °)╯╧╧