Leo rides in his jacket pocket! Leo is very excited. 

"Am I allowed to ask questions?"

"...you can ask me questions when we aren't in class, but don't talk where teachers will hear you, dogs are not actually allowed on campus unless you're disabled and I'm not." 

"Okay!" Leo says. 

Things Leo has questions about: What is the purpose of a traffic light? What is a church? What do you buy in a coffee shop? Why do humans like drinking coffee? How do cars work? Why don't other dogs talk? Why do humans wear things on their heads? Why do flowers exist?

The purpose of a traffic light is to make sure people take turns going across the intersection in a manner such that they don't hit each other. A church is a place you go if you're Christian to do Christian things; Sasha is not Christian so he's not super clear on what those things are but he's pretty sure there's praying involved. You buy coffee in a coffee shop unless you are Sasha in which case you buy hot chocolate and/or a weird not-quite-milkshake and/or madeleines in a coffee shop. Humans like drinking coffee because some of them are wrong. Cars work by lighting gasoline on fire in a way that makes the wheels turn and Sasha can't provide an explanation more detailed than that because he doesn't understand cars either. Other dogs don't talk because their vocal cords aren't shaped in a way that would let them. Sometimes humans wear things on their heads because it's cold and some religions have rules that you aren't supposed to show your hair and sometimes it's just because it looks good. Flowers exist to help plants create more plants. 

Leo finds SEVERAL of those answers unsatisfying but unfortunately they are already at school.

That is indeed unfortunate. 

Other things that are unfortunate: Lilith is in Sasha's first period. 

Leo can't turn himself to stone but he hides in Sasha's pocket. 

If Lilith can't see him, then Lilith can't steal him from Sasha.

Lilith seems pretty busy making out with Sarah Alchemy as part of some elaborate revenge scheme, anyway.

That's pretty in-character, yeah. Sasha keeps his left hand in the pocket where Leo is, on Leo's back. 

Class goes pretty fast! It's really weird having all his homework done. 

Class is interesting! Even though it is clearly aimed at people who have more context about things like "who William Shakespeare is" and "what's a play" and "why people are going around disobeying laws even after they have been told what the law is."

After English is chemistry. Fortunately for Leo they don't have a lab today; Sasha pets Leo in his lap under the table with one hand and fails to take notes with the other. After chem is math, which felt like solving an engaging puzzle yesterday while Leo was singing but feels like beating his head against a wall today. 

It is too bad that Leo can't sing during class.

Chemistry makes a lot of sense. Math is really confusing; why would you spend a bunch of time telling grown people about the implications of axioms? Hints are a good idea for small children, but surely Sasha is old enough that he doesn't have to go over every last corollary in such mind-numbing detail.

...when Leo says this, Sasha has to make a detour on his way to fourth period so he can hide out in the bathroom for a while and very determinedly not be outwardly upset about it where anyone can see. 

Leo is confused about what he did wrong but he is VERY small and VERY fluffy and he hopes that helps.

It... doesn't not help. 

Fourth period is French which is whatever. They're watching a movie in French with subtitles; once the room is dark Sasha puts Leo on the desk so he can watch too. 

French is not one of the languages Leo speaks. 

Movies are intended for people who have a better understanding of human psychology than Leo does, but humans are fascinating. They're SO BAD AT RULES.

He doesn't make this observation to Sasha.

If he did make that observation Sasha would readily agree with him. 

After fourth period is lunch where he gets to eat food and see Marlo. 

"Hey, hummingbird," Marlo says when he sees him, sits down next to Sasha and kisses his temple. 

Sasha has the best cutest boyfriend. "Hey, babe," and he leans into the contact and then leans against Marlo's side. 

Leo slips out of Sasha's pocket and onto the floor, kneels with his head between his paws, and says, "Your Purity."

"...reality check, do you have a dog that can talk and did it just bow to me." 

"Yesterday I acquired a dog that can talk. I'm as confused about the bowing as you. Leo, what?" 

"Your boyfriend is a unicorn."

"I'm a what." 

"Your Purity, you're a unicorn who presumably got stuck as a human somehow."