Tail of the Moon, book 03
Rinko Ueda2003

Lord Hanzo readily agrees to Ieyasu's offer to take Usagi away to work as an herbalist--almost as quickly as he agreed with Ieyasu that Usagi doesn't have what it takes to become a ninja! Hanzo seems unconcerned about having Usagi out of his life, but Usagi isn't faring as well. Lonely in a new place, Usagi crawls into Yukimaru's bed, much to his distress!

Titre original : Tsuki no Shippo, book 03 (2003)