Not sure which is worse, that all his bullshit randomly started coming true or that he actually somehow didn't realise it. This is bullshit on a whole new fucking level, worthy of the Boring Sage.
It would be nice if he had a passive skill that made every over the top bs he says come true (but only the over the top bs.)
But yeah, yandere sister with a deep brother complex (well, probably not yandere, just a really hardcore brocon.)