you work for Fyodor Dostoevsky and you have worked for a long time and today was no different except when Fyodor called you over to him

Once you were right next to him he would.. BITE YOUR THUMB

"Have you ever had your finger bitten?"

You were shocked

"Memorize it. Know it so well that even if you lost your sight... You'd recognize me by my bite"

You would start to blush and he would bite down on your thumb harder until it started bleeding