What Luna says is law

Hermione drops to all fours, her tongue lolling from her lips as she starts panting like a dog. She whimpers, her thoughts only of Luna, her master. She bounds towards the Ravenclaw dorm at top speed, drawing the attention of several curious students as she scampers past on all fours, whining animalistically for her master.

She eventually runs into the quirky girl just outside the dorms. Luna looks at the eager and docile Hermione with intrigue, “Hermione, what are you doing here? And why are you crawling on the ground?”

Hermione whines nonverbally, magically forced to commit to the character of a dutiful pet. She begs Luna to understand without words, and fortunately the odd Ravenclaw picks up on the situation, “Oh, right, the potion. Follow me, I mean, heel, girl!”

Hermione obeys loyally, ready to fulfill whatever odd whim Luna has. Luna leads her to a nearly empty classroom, where only Ginny sits and watches Hermione being walked in with curious amusement, “Whatcha guys doing? Roleplay?”