Edited a couple things in the first snippet and added more. Enjoy.
"Ok. This time they really went too far."
"N-No, it's alri-OW!"
"Hanatarou, they booby trapped your broom!" Isane said, enraged. Kiyone flinched as her older sister pulled yet another splinter out of Hanatarou's right arm before turning her glare on her. "You don't have anything to do with this, right?"
"O-Of course not! I'm not so... Ruthless." The shinigami said in her defense as another member of their division pulled the last splinter out of their patient's arm before cleaning the cuts.
As suggested, Kiyone had followed Hanatarou around all day. The 7th seat had done nothing that could validate Kiyone's theory, much to her chagrin, and she had been witness to some of the daily bullying the boy was subject to but the day had ended abruptly when Hanataro's broom suddenly exploded in his hands and filled his arms with wood splinters. "I agree with you, nee-chan. This is way too much for a prank."
"Indeed. I'm opening an investigation about this." Isane declared as she strapped a few bandages to wrap Hanatarou's arms with.
"No, Isane-san. It's okay... I mean..." The two sisters turned in Hanatarou's direction as one woman. "That could cause trouble, right?"
"C-Cause tr-!" Isane groaned. The image of the perverted Hanatarou disappeared from the younger sister's mind.
"It's okay. I'm used to it." It was replaced by another one.
"... Yamada-san, I may have a theory about why your Zanpakuto doesn't want to talk to you."
"Uh? Really?" The shinigami said as he checked he bandages. "What..."
"IT'S BECAUSE YOU'RE A WIMP!" Hanatarou cringed while his division colleagues instinctively plugged their ears just in time. As Ukitake can sadly testify, Kiyone can be quite loud when she wants to. "PEOPLE PRANK AND TAKE ADVANTAGE OF YOU AND YOU DON'T EVEN REACT! NOW THEY TRY TO BLOW YOU UP AND YOU DON'T EVEN WANT TO KNOW WHO WAS IT?!"
"Yeeee! I-I'm sorryyyyyyyy!" he screamed, cowering in fear, much to Kiyone's further annoyance. She glared at him.
"That's it. You're coming with me."
"U-Uh?" Kiyone suddenly grabbed onto Hanatarou's arm and started pulling, bringing him away.
"Kiyone!"
"Sorry, nee-chan. I just can't stand it. A guy this wimpy... Come on!"
"Noooo!" The 7th seat cried pathetically before he was forcefully shunpoed away.
"... That... That... Aaaargh!" Isane roared, pulling at her hair. "Why must she always be like this..."
"Oh, I think it's fine. It's not like your sister wants to harm Hanatarou, right?" Isane sighed and turned around, the visage of her captain calming her down a bit.
"Not intentionally. But my sister is known for letting herself be... Dragged into troublesome endeavors." The squabbles with her fellow third seat are legendary. She wished Ukitake would make up his mind and choose a new lieutenant, already. "And Hanatarou isn't exactly one to oppose being bullied around."
"Well, as long as she doesn't do anything to worsen the wounds on his arms, she should be fine." Isane nodded... And then realized something. She slowly turned in Unohana's direction, her eyes wide. The older woman was smiling.
"Captain... Hanatarou had the incident less than half an hour ago."
"Did he, now." She replied amicably.
"... The point is... How did you know..." Isane stopped. Unohana was still smiling but her eyes were now opened. "... Nevermind."
-Breakline-
"Alright. Here's the plan." Kiyone released Hanatarou as soon as they arrived at their intended destination, a meadow near the 13th Division's quarters, cue him tripping and falling on his face. "I don't care how or when, I'm gonna beat the wimp and make a fine shinigami out of you!"
"B-But... I'm a seated member already..."
"Then start acting like one! I'm not asking you to suddenly become as cool as Captain Ukitake, but at least to stand up for yourself. As the 13th Division's next Lieutenant, I can't let this slide! Now sit." Hanatarou wanted to remind her that he was in the 4th, but thought against it and acquiesced. "Now, what do you know how to do other than healing?"
"Huuu... ... Chores?"
"... Something concerning fighting?" Kiyone deadpanned. Hanatarou laughed nervously.
"Sorry. Well, I'm adept at using healing Kido and I know a few defensive chants... But it seems that there's something wrong whenever I try using offensive Kido." Kiyone raised an eyebrow at that. "The outcomes are never pretty..."
"And your Zanpakuto?" Kiyone said, and she noticed a physical reaction, like he suddenly felt uncomfortable with the subject they were discussing. "What are its powers? And why do you not carry it around with you? It's not only because it won't talk to you anymore, right?"
"... N-No other reason, really." So there was another reason. That he wasn't willing to share.
"I see. I guess that your swordmanship isn't that good because of that, too." Kiyone sighed, huffing and raising one of her locks in the process. "This is going to be a long process."
"Well, thanks for tryi-"
"Sit." He sat. "I'm not letting someone like you serve under nee-chan... I'm gonna need help, though." She was the one who got back on her feet, this time. "Alright, you"re off the hook for today. I'll come looking for you soon, though!"
"Ehm, Kiyone-san..."
"What?"
"What was the point of coming all the way out here, then if you only wanted to ask me a couple questions?"
"..." Now she felt stupid.
-Breakline-
"That was so strange, Isagomaru. She isn't like Isane-san at all." As always, Hanatarou recounted his day to his Zanpakuto while he readied himself for bed. "And now she said that she wants to... I guess train me. She said I was too much of a wimp. Oh, my..." Hanatarou had stopped talking when he heard a familiar sound. "Hisagomaru... Did you say something?"
He was only met with silence. "I guess... I imagined that. Well, good night." What Hanatarou didn't know is that his zanpakuto had indeed talked, although only in a whizper. And the whispered words were 'I think I like her already'.
-Break-
"Meeting adjourned! See you next week!"
"Come on, Yachiru." Kenpachi motioned her and the little lieutenant immediately jumped and latched onto Kenpachi's shoulder.
"Bye, everyone!"
"Have a good day."
"Sayonara..."
"Byebye! Nemu, wait!" The purple haired shinigami was joined in her walk by Kiyone, who proceeded to adequate her pace to her quarry's one. "Should we go back together? Part of the way it's the same."
"Sure." Kiyone smiled, happy that the girl hadn't refused. She never knew how to act around Nemu outside of the SWA's meetings, and even there the girl was a strange as her 'father'. Not in a dangerous or lethal way, fortunately. "So... What are you going to do, now?"
"Mayuri-sama is currently occupied with a long duration experiment, so I will have to coordinate the division members."
"Huh. That will be a lot of work." She would know about it. Whenever captain Ukitake became too ill, it was up to her and Sentarou to do just that, and they were in two. She wondered how one person managed to do it alone.
"Not really." She replied. Kiyone nodded and decided to just ask. No point in dancing around it.
"Nemu... Your captain is like, a mad genius. You're somewhat of a scientist too, right?"
"... Being Mayuri-sama's aide requires being knowledgeable in a numberof areas, yes." Nemu said, turning in Kiyone's direction. "Why the interest, if I may?"
"Well, I kind of need help figuring something out." She admitted, crossing her arms in front of her chest. "Remember last week, when we talked about the guy from my sister's division? The one whose zanpakuto won't talk to him no more?"
"I recall."
"Well, I've talked a bit with him, and he also admitted to not being able to use offensive kido. Like, at all. He says that every time he tries, bad things happen or something like that."
"Oh." Nemu said, her slight inflection of voice proof of surprise or at least interest. "Interesting."
"Since you're a science wiz of some kind, I thought you could know something about both things, you know. I just can't stomach that kind of wimpy shinigami..." Nemu nodded, and put a hand to her chin.
"Regarding the zanpakuto, it might be difficult to determine the cause of its silence unless it's clinical. For the kido... Maybe Mayuri-sama might have once studied something like that. It might be in his files." She turned to Kiyone again. "It would be easier if I could examine him with proper equipment, though."
"Hmm... So, basically, I have to convince that scaredy-cat to come get examined by the 12th division whose captain is quite infamous for his ethics or lack of thereof?" Nemu nodded. Kiyone grinned. "Not a problem."