Besides some dabbling into a minor headcanon for Yagen in the beginning, there is literally no point to this. Well...that and the implied harem at the end...
A contented sigh escaped the tantou as the saniwa finished up shampooing his hair. Taking the showerhead off the wall, she started to wash off the soap on Yagen's body, taking extra care around the burn scars on his back.
It made her a little uneasy to see those, sometimes. Scars weren't uncommon among the swords, especially those who went through traumatic events. No matter how many times they were repaired or re-tempered, those scars stayed. But with Yagen, it was still a mystery as to where and when those scars came from. Even with what is known about his past, he was so careful about making as little about his own past known. She suspects that those scars were the result of the Honnou-ji Incident, but Yagen would never say anything about that or whatever happened to him afterward.
But, now is not the time to be thinking of that! Bath time was for relaxation, not dwelling on the past!
Making sure the bath water was still warm, she got in the tub. Yagen followed suit, settling with his back to her.
"Aah, this is always nice." He said as he started to lean into her.
"You think so? This bathroom's pretty small. Wouldn't you rather be bathing with your brothers in the outdoor bath?"
He turned back to her, "Um…don't take this the wrong way, but sometimes I find all their noise and messiness to be a little…annoying."
"Really? You know, Midare-kun was saying the same thing to me earlier."
"What? Midare of all people said that? He's one of the guiltiest ones!"
There was a pause and then they both snickered.
They returned to a peaceful silence. Yagen began to trace random patterns on the water's surface. She wanted to put her hand on his—or rather the scars on it.
"So, Taishou, what are the plans for tomorrow?"
"Tomorrow? Well, the chores will be cycled through—by the way, you're on laundry duty—and I'll be going into town with Hasebe-san for a shopping trip. The first auxiliary team still needs to rest up from the sortie earlier today, so they have the day off. Also, the second and third auxiliary teams will be sent out to do expeditions."
"Sounds like Taishou will be busy all day."
"It's a given. Oh yeah, also the primary team will do a couple standard sorties to gain some experience, so good luck tomorrow."
"I see. So who's leading?"
"Horikawa-kun. He's…scarily efficient on the battlefield."
"Yeah, he is. It's like there's a switch or something because the moment we come back—"
"—he returns to being like a wife. Go on, admit it, he is." Yagen responded with a noncommittal sound and a slight shrug.
After a little more time, Yagen piped up again. "Should we get out soon? The water's starting to get cold."
"Ah, yeah, you're right." She shifted so that Yagen would get up before she got out herself.
He drained the tub and she got a good look at his entire backside. When he turned around, she pulled him into a kiss and grabbed his ass.
When she pulled away, he blinked and then smirked. "What was that for, Taishou? Don't tell me you're in the mood again? Isn't that why we took a bath just now?"
"No, I just felt like it." She gave his ass a squeeze. "I did it with Mitsutada-san earlier. I feel satisfied for now."
She handed Yagen a towel. "Hey, you want to sleep in my room tonight?"
"Of course, Taishou."
She wrapped a towel around herself. "You know, I slept with them individually, but do you think a threesome with Namazuo-kun and Honebami-kun is possible?"
Yagen shrugged. "I don't know, maybe."
...everyone practically sleeps with everyone.