Bahorel reshelves it, but says "You know you can take any of them you like. I haven't found any limit on how many a person can borrow at a time. You don't have to bring them back here either; leave a book at the desk and it'll get sorted."

He sets off for the end of the aisle. "I like to reshelve them myself, it's the only way to keep track of the paths here-- but then I don't have any pressing engagements. You're teaching Feuilly how to use a sword?"

It's not so much that Bahorel's succeeding-or even trying- at keeping the innuendo out of his voice there as that he's used to dealing with friends who will absolutely hear it anyway without any need for stressing the idea, and who often count it a triumph to make a joke no one gets.