Her swordsmanship.

Minato stepped out onto the balcony shared by several rooms, just admiring the beautiful day, and saw Miya standing out in the yard. "...is that a sword on her hip?" he questioned, staring down at her.

"...huh, I think it is," Musubi mused as she joined him, hugging his back and pressing her breasts to it. "Wonder how good she is at it."

"Hopefully, we never irk her enough to get a first hand demonstration," Minato joked, relaxing against her as he took a moment to just enjoy the sheer intimacy. They watched as she stood serenely beneath a tree. Several leaves dropped from the branch above her. Then, she drew her blade, and swung it with an incredible degree of grace. Minato could barely even see the flash of steel, before it went back into the sheathe. Every leaf? They were cut in two as they drifted to the ground.

"Whoa!" Musubi gaped in amazement. "Not a single wasted motion!"

"No kidding!" Minato joined in on the fish impression, before recovering, and taking a look at the scabbard from a distance. "...I think that sword's called an Iai... Guess Miya's pretty damn strong herself, eh?" He turned to look at Musubi, and realized she wasn't even responding. She was staring, stars in her eyes. "...Musubi-chan?" he asked slowly.

"...Miya-chan!" Musubi shouted down towards Miya, who blinked and looked up.

"Oh, good morning, Musubi, Minato!" she called up, refraining from calling Minato her Master where others could hear. She knew how to keep a secret, after all.

"Please, let me have a spar with you!" Musubi called down towards Miya, who blinked.

"Oh, some early morning training, is it?" Miya giggled, putting a hand over her mouth, clearly entertained by Musubi's exuberance.

"Eh? I thought you said no fighting at the inn!" Minato called down to Miya.

"Well, this is a yard, not inside the building, and I never said anything against an agreed round of sparring!" Miya replied cheerfully. "There's a difference between practicing some combat techniques, and actual **** with intent to harm! The latter is what's banned here!"

"Sweet!" Musubi cheered, glad there was some kind of loophole, before she jumped right over the railing of the balcony, ignoring Minato's startled yelp at the sudden action. Musubi landed, and raised her fists in readiness, practically shaking in excitement.