Written for Doom Candy who wanted to see a little bit of Zoro and Kitetsu's relationship.
Zoro shot a glare to the sword in his left hand. The blade was dripping, and it was splattered up to the hilt with the warm blood of their enemies. Sandai Kitetsu could never kill cleanly. Wado and Shuusui never had a problem killing their targets without spraying about their blood, but Kitetsu never wasted an opportunity to paint himself crimson with each life that he took.
Zoro sighed, easily wiping the first two clean before sliding them into their respective saya. He'd clean them properly later when he wasn't standing amidst the remains of a violent battle. Kitetsu though was beyond a simple wipe down. The blood painted blade shined red in the light of the moon, challenging Zoro with its macabre glare.
All the blood in the world was not enough to satisfy Kitetsu. The blood he wanted the most was Zoro's.
Zoro could practically feel the blade humming with want. It had done its job, played by Zoro's rules and obeyed his every command with perfect, albeit messy, precision. Now it wanted a reward, wanted it so badly Zoro could feel it.
With another sigh, Zoro wiped as much of the blood away from the blade as possible. Kitetsu wouldn't want this tainted after all. With a portion of the blade as clean as it would get, Zoro ran his fingers down the side, tracing the pattern of the hamon. Kitetsu's want intensified, ignited and angered by the gentle teasing. This sword was a sword of action, not a sword of patience.
Relenting to Kitetsu's want, Zoro moved his thumb slowly across the sharp of the blade. The cool metal split the pad of his thumb so easily he didn't even feel it until the blood was spilling across the blade. He pulled Kitetsu back, stopping the blade before it slid clear through his thumb, an action it so desired.
Kitetsu wasn't satisfied, not in the slightest, but he relished in the feel of the blood of the powerful swordsman against its blade. To know he had drawn blood from one so strong gave him a thrill, a high beyond that of his usual enemies. Blood was blood, but this blood was something different, it gave him a sense of power.
Kitetsu temporarily appeased, Zoro turned from the battle grounds and made his way back to the ship, keeping his bleeding thumb on the sword as he went.