Likely not. Yotsuyu was not the sort to ask if she'd be allowed to backhand you. She simply did it. It was just in her nature.

"I am as certain as I may be. Especially with the magic here, there seems to always be an element of chaos within it. However, not to sound arrogant--" Though she certainly is arrogant, by all means. "But I am very good at Modification magic, so."

And he said he'd allow her to cast it anyway, so Yotsuyu wasted no time in touching the tip of her fan to the clothing on his arm--and blessedly, it darkened from the vile green to a fetching indigo, somewhere between blue and purple.

"Hmm." Her nose wrinkled slightly, but there was a swell of satisfaction in her voice. "Not what I had precisely intended, but it is quite better than what you'd been forced into."