He really does! :-D
Okay... It really has been a while since he was trying to advise someone this green.
"You don't have to do anything, but you're missing out on a whole world of pleasure if you don't," he suggests gently, and turns the bottle in Kanji's hand so he can read the blurb on it, which mentions that it's eminently suitable for anal use.
"You'll find just dumping a bit in your hand will make jerking off a whole lot slicker, but this stuff is also particularly useful if you want to try fingering your ass."