You were sleeping half the day

You were insomniac so you couldn't sleep at night, so you were most of the time sleeping or tired during the day. You sat right behind Ojiro and sometimes you just fiddled with his tail. He didn't mind, you weren't rough or anything. If anything your touch was super gentle- like feather light gentle. But today you were super tired and the warmth of his tail provided comfort.

You were sitting in class- already half asleep as usaul, your hands fiddling with Ojiro's tail when you got a great idea- the fur was soft. It would make an amazing pillow. So thats what you did. You gently set his tail flat on your desk, and without a word you sat your head down- probably already out cold.