Sion is in Siennas body because he was killed in his previous ‘life’. So Sion will probably stay in Sienna’s body because as mentioned before Sion’s body doesn’t exist in this ‘life’ anymore
Still.. why he regress to that evil body. Still didn't feel fair for me. Sion didn't got his own body back, but regress to his worst enemy body. And if i believe he will make that evil bitch look more kind when he isn't that kind and evil. It just didn't feel right to me. Ugh it hard to say. Maybe didn't suit my taste. I prefer he got new body or his own body back than go to his enemy body.
Interesting but i don't like it cuz.. what about sion. Why they need to swap bodies. :)