Corrupted Soul

(Rewrite!) Nasuki, still grieving over the loss of Atemu and now traumatized by the death of Hikari, pleads Tamotsu for help in reviving her. However after some time Tamotsu returns, but not the same as he was before. Can she save him from his corruption, or were they both doomed from the start? Black MagicianxOC, KaibaxOC. (This was posted for Halloween in 2013!)