Technically Cao Cao did die, as he was sent to the Realm of the Dead. He also got his Longinus taken away from him; not sure if that would kill him seeing as it has a materialized form that can be taken away, but regardless.
If you pay attention to the situations between Kuroka and Ise in volumes 14 and 15, it's pretty obvious that she's falling for him. Her volume would most-definitely put her high up into the harem, and that basically means she gets more spotlight and Ise's protection by officially becoming part of the group (up until now she's pretty much been a freeloader).
Quote:
Originally Posted by B214
Kuroka doesn't even want to become anyone servant anymore, she prefers her current life with the Vali Team.
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Is that why she spends most of her time living at Ise's house and only goes to Vali when necessary? She's never expressed any interest or distaste in becoming a servant again. Especially if it were someone like Rias or Ise.