What the hell!! I was rooting for Mao ?. Now, considering Keiki's luck, the next candidate, his younger sister, could turn out to be a Yandere?. I hope not.
What if all of them are one person split into multiple personalities, and in the end they all fuse back together and the fetishes cancel each other out to form a somewhat more normal one?
@DeusVult naw that wouldnt fit right, if it was NTR in this case it would be that the little sister wanted HIM to get nailed by one of the other girls xD