The first chapter of the sequel is up for those who want to read it. It's called Children of Ookami. Here is a sneak preview:

Iruka stood in the Hokage's office, waiting. He was in a relaxed stance, his shoulders loose, hands clasped behind his back. The majority of his weight was balanced on his right leg, giving his posture a slight slant. He was dressed in the typical uniform of a Konoha ninja: black pants, black shirt, and flack jacket. His hair was pulled up into its signature ponytail at the back of his head. Reaching up, the Chuunin lightly scratched the scar over his nose with a clawed finger. His dark tail, which was longer and thinner than that of most of his kind, was still behind him, the tip resting slightly on the floor.

The door opened and Iruka glanced over his shoulders. Tsunade practically stormed into the office, muttering something under her breath about damn old council men. Smiling, Iruka faced forward as Tsunade approached the desk. Flopping down in the chair, the Hokage studied him for a moment.

"Shizune tells me that you're here to ask for a month of a leave," Tsunade said.

"I am and, if you give it to me, I already have a substitute lined up for my class," Iruka replied.