Honestly, I had high hopes for Kiichi, but he´s pathetic. Secret Mastermind? Tech wizard? Nah, he really is just a hikikkomori who can´t reel in his hormones.
I would actually say that I hope we do because I think she's the best hope of ever reforming Kiichi and it's only since she made it into his life that he's shown progress.
I think most of the demented things he does is him trying to purposefully push people away or try to get them out of his life out of fear of his mother's wrath or that she will use them against him. She's this omnipresent force in his life that makes it so he hasn't developed into a normal, healthy adult, and so I think his attempts at being creepy are just more or less a cover for his deeper insecurities that she has instilled in him.
Oh how I hope that at the ending, both FMC and MMC will burn up together along with his shitty mother. It will be a spectacular ending for this spectacular manga...
@Tamerlane I think you're right, Kiichi is probably exercising control and dominance in order to feel less small and helpless when his mum exerts control over him.