M-Mutsu-san, she...Ha! I'm well used to cleaning up your messes, after all!What's the matter?she has her 'messes' 'cleaned' up by Nagato-san!?
The Japanese phrase 尻拭い /shirinugui/ idiomatically means 'to clean up someone's mess' but literally means 'to wipe a person's ass'Capable adult!Huh? A play like that?Hmm?Nagatooo! Thank you so much for changing jobs with me!Yeah! I'm well used to it!They're misunderstanding you!PAY ATTENTION!!