Rurikawa is soooo da** selfish!! Tsukuyomi knows well that Rurikawa loves that rabbit and so he wanted him to be happy with his "fated". So I don't know why he stopped Tsukuyomi from leaving with his kids and baby daddy. Compare to the 2 I rather have Tsukuyomi go with that ass**** of a baby daddy than having to always see Rurikawa getting hot and heavy with that rabbit 