[He... finally manages to get his wits mostly about him. Those were fangs. Seriously?

The easy answer is that his sensei is delusional, some sort of freak with a vampire kink, willing to pour enough effort into it to... file his teeth? Get tooth extensions? Or something?

...But he doesn't believe that. Still, it's most sensible to act like he does, so his tone is scolding when he musters up the ability to speak.]

Sensei, that's the sort of kink you're supposed to warn about and ask consent for.