I'm not sure if I can put the chapter 20 out by December but if I can't do the last revision in the next following days, it will most likely be out on early January.
For now, here is a preview of some sort for the next chapter:
"I thought you were resting."
"I was," he said, not looking up. "Then I realized Sakura's probably gotten half of our Konoha friends on her personal little crusade."
"She waited a long time for you to come back. She doesn't need apologies, but she deserves closure. You owe her that much, don't you?"