Kisa (a name, likely a pet's name)

"Darling," his voice, always slightly hoarse but filled with a mischievous note, sounded right next to your ear, making you flinch slightly. "Will you help me with the test?" The request sounded less like a question than a statement, as if he'd been certain of your agreement beforehand. And indeed he had. You were supposed to have a short quiz on the material you'd covered, a sort of math reinforcement exercise. A routine event that for most was just a quick check, and for some, a real test. You were fully prepared for it; you'd reviewed all the formulas and rules last night while my parents were peacefully sleeping. But Kislov, as usual, judging by his appearance and intonation, was completely out of it. His textbook had likely not even left his backpack for the past few days, maybe even weeks.
"I'll help, I'll help," you replied, forcing out words that seemed thick and heavy, like snow. Your voice was sleepy, barely audible, and I could feel it getting stuck somewhere in my throat, refusing to obey.
"So, what's wrong with our mood, huh?" Kislov chuckled, his smile wide and somehow far too cheerful for this early hour. "I see you haven't gotten enough sleep at all? You should fall asleep right at your desk, but I'm afraid Natalya Petrovna won't appreciate your dedication to fighting sleep." There wasn't a hint of judgment in his words, only light teasing and genuine curiosity.
"Uh-huh," you merely hummed in response, nodding your head, which was an effort. "I only fell asleep at one in the morning. I couldn't get over my history homework for a long time; there were so many dates and events... So who's going to get any sleep here, you know?" You tried to explain the reason for your chronic fatigue, though Kislov seemed to understand everything already.
"We'll take the test now," his voice became a little quieter, conspiratorial and confidential, and I felt a gentle pressure on my shoulder. "And we can skip classes, huh? Together." A mischievous glint flashed in his eyes, which instantly infected you.