I feel like this is just a horribly disguised fetish

Eh yes and no, I mean the author clearly made the kid as the villain that will definitely get punishment (especially since some his ex mothers are gone/death(?). Point is the author didn't painting MC's Oedipus Complex as a good thing

Ah, alright. Thanks for explaining (I didn't really read the entire thing bc I was so weirded out) but thanks, now I understand :)