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"Permission to use the restroom", like what? What's he going to do, say no? I can take a shit in your trash can if you'd prefer. I'm not asking for permission, I'm informing you that I'm going to the restroom, deal with it.
i have distinct memories of one of my early teachers having read a book to the class about a kid who peed themselves because they weren't allowed to go to the bathroom, and from that day on we always had that one comfort in her classes: you're always free to go to the bathroom, no need to ask (just inform that you're heading to the toilet).