Are we sure this show is about magic? It looks like it's more about sister-brother love. Mostly from sister side, since she is kind of stalkery and generally obsessed with her brother. But the brother does not seem to mind that much. I also assume, that since he reincarnated, he probably is much older (as usually is the case), which makes it even more weird.
Even if this show is about magic... Is that magic of horniness or something? If that's the case, it adds another layer to the weirdness. At the least I am curious to see how they will spin this next episode. Most likely they will try to dress it up as "love magic", which will make this an insta-drop for me at that point.