I'm not so sure you'd consider a temporary wolf transformation a werewolf but whatever.

"The General Department is way stronger than I last remember!" You threw Kirishima out of the way of a dazzling gleam blast just as he yelled out that remark.

"Quit talking more dodging!!!" You snapped breathing heavily before another beam were shot at you at full force. You dodged just in time, but still too close of a call for your liking. That was until yet another beam were shot for your location, you were too exhausted that your legs refused to listen. Second by second, the beam of brilliant blinding light came that much closer to killing you.

"(Y/N)!" Kirishima dashed out, his entire body going rugged with sharp edges as he lunged out to take the blow of the dazzling beam instead of yourself.

"Kirishima!!!" You cried, the red haired boy were thrown backwards to crash into a building at full force. Even his hardening quirk did him no good. The attacker stopped with his barrage of attacks as you ran over to your friend with tears in your eyes hoping with all your heart that he survived. You crawled over the rubble and through the Kirishima shaped hole in the wall and joined his side. He were just fine, except... He had pointed dog ears.

"Kiri?" You called out to him in pure confusion.

"Oh I'm just fine, we have an exam to finish," Kirishima stood up with your aid. "What?" Kirishima asked noticing your stone cold stare directed at himself.

"You have ears and a bushy tail," you reached down and grabbed at the base of his tail that were shades of red and pink. Kirishima yelped, not expecting you to touch his butt without such a warning. Instead, he blinked, taking a hold of the tail with a cold sweat to form upon his forehead.

"What the-"

"Your nose!" You squeaked. "It's turning black Kiri!"

"What the hell is going on?" Kirishima ran around like a headless chicken, squawking on an on about how he his appearance became more and more beastly by the second. This went on until he were a large wolf with rugged red fur running on all fours. All words were replaced with whimpers and howls. Your heart broke.

"Kirishima... You're clearly a wolf now. That bastard's quirk must transform people into animals. I... I really hate Aizawa for making us fight him..." You stomped, Kirishima continued to whimper, running up to you with red glossy eyes filled to the brim with worry. "No matter what. This is still our exam Kirishima. Let's end it," Kirishima pawed at your hand just before you could walk away. Even in this beastly form, Kirishima still had that golden fighting spirit you've came to adore.

You both did finish the exam with an A! Kirishima still had control of his quirk even in his wolf form and those beams the opponent used no longer effected Kirishima either. So the boy kept taking the shots and you both came out victorious! Maybe not Kirishima though, the student claims he cannot cancel out the effects of his own quirk. The animal transformation quirk wears off in time.

-----

Aizawa stepped into the classroom, the dark rings around his steel eyes were at their darkest and hair pulled back into a messy ponytail. It were like the man never slept at all. There were this chain he had clenched in his right hand that led to the outskirts of the doorway. Upon reaching Aizawa's desk, his chain leash tightened up out of nowhere before he spun around with clenched teeth.

"What's wrong with him?" You asked openly for anyone to answer. You only received a mix of "I don't know," and "beats me."

"Get your ass in here!!!" Aizawa stomped, yanking with all his might on the chain leash. A big red furry blur was thrown into the room and crashed into the wall behind the teacher.

You recognized the red heap of fur. "Crap, Kirishima..." You hid yourself behind your arms on the desk. That boy more than likely kept Aizawa up all night and now he'll take it out on all of us...

"Since when did you get a dog Mr. Aizawa?" Midoriya innocently asked not realizing who the wolf on the chain with spiky fur really was.

"He's not a dog let alone mine!" Aizawa snapped, yanking on the leash once again. The red wolf sat up with a deep growl.

"Then what the hell is it?" Kaminari got up from his desk only for the wolf to growl, taking on an even larger appearance upon hardening his muscles. Kaminari shrieked like a girl and backed away, hiding behind Bakugou's desk.

"Yo dunce face, don't use me as a shield!!!" Bakugou snapped and Kaminari darts for your desk next.

You reached behind yourself, grabbing a handful of Kaminari's blonde locks before pulling him out from behind. "Yeah Dunce Face... You can't recognize that's your best friend up there?" You practically spelt it out for him.

"K-Kirishima!?" Kaminari gasped. The red wolf settled down immediately, wagging its tail with glee. "Crap how did this happen?" Kaminari sighed.

"Me and Kirishima were partnered together for the special training session instead of the 'who done it' mission like Bakugou, Iida, Midoriya, Ochako, Todoroki, and Tsu had to do. We had to fight students from the general department. And one of the students had a quirk that transforms his target into whatever animal the user just so happens to be thinking about... So yeah... Kiri's a wolf now," that was a mouthful. You don't want to relive that day again that's for sure. Fights are stressful enough as it is and now your best friend is an animal...

"Thanks for the explanation," Mr. Aizawa groaned. "I need one of you students to watch over Kirishima until he transforms back in a week... Technically six days now." Silence, Kirishima whimpered. Must be hard learning no one was willing to watch over him for a few days. "Fine... I'll offer an advantage on your next exam. A choice in partners," at this point the teacher was bribing, hard core too. Aizawa must be desperate to get rid of Kirishima. Yet everybody was deep in thought on if they should accept this bribe, you rose your hand.

"Will it be a problem if I'm a girl and Kiri's a boy? If not, I won't mind watching him," you explained, then lazily put your hand back down.

Aizawa smirked. "He's all yours," Aizawa unhooked the chain leash from Kirishima's dog collar and he sprinted right on over, knocking you out of your desk with a shower of kisses.

"Gross Kirishima!" You used your hands to protect your face. "Just because you got transformed into a wolf or dog or whatever! Doesn't mean you can act like one!!!"

-----

You sighed, taking out your keys from the back pocket of your jeans. Kirishima kept pawing at your legs, nudging you with his forehead too. Why were the boy so antsy to get into your room? It's just an average teenage girl's dorm room. Nevermind, almost everybody in class 1A has a particular theme to their bedroom like Jirou had a musician's dream of a bedroom, Midoriya's was a shrine to All Might, Sato's was a practical kitchen, not to forget Kirishima himself whose room was a gym. All thoughts aside, once your hands found the keys in your pocket you dropped them. "Great..." You muttered, kneeling down to retrieve them. Kirishima perked up his red ears and lunged out for them before running away. "K-Kirishima!" You gasped chasing after the dog.

"When you become human again you are so dead!" You growled, chasing after the wolf of red fur as he purposely made you do sharp turns and dodge away from reach whenever you lunged out to catch him. Your keys made high pitched rings whenever one key hits another as they dangled from his jaw. Then, you just stopped chasing him all together. "Fine then Kiri, I'm sleeping in your room," you sang since you so happened to have the keys to Kirishima's dorm room as well thanks to Kaminari who for some reason had Kirishima's spare. Kirishima skids on the carpet hearing you out and made a dead line bolt to where you walked, dropping the key at your feet. "Thanks Kiri," you snickered, petting him atop his head playfully messing up his spiky tuft of fur. Kirishima grumbled like a dog who sounded like they were talking when really they were just noises.

You successfully unlocked your bedroom and opened up the door, "get your cute butt in there," you told the wolf. He happily scampered in, instantly curling upon your plush bed all curled up in a ball. He hid his cute face behind his bushy tail in which you giggled. It was all too adorable! "Okay okay, don't get too comfortable cause you're my guest until the quirk wears off," you snickered, changed your clothes real quick (forgetting that Kirishima was an actual human not an animal so he just got himself a small show) then stepped over to the bed where Kirishima were still playing around with that bushy tail hiding that adorable face of his. "Kiri... You know that's my bed. I need sleep too," Kirishima grumbled again, getting off the bed.

"Thank you," you ruffled the top of his head again. Such an action just came out of you like it were part of your routine. However, you retracted your hand. It all felt wrong, despite the fact Kirishima tilted his head with confusion as to why you stopped in the first place. "Sorry... I keep forgetting you're a human not a pet."

Kirishima nuzzled your hand lovingly with his snout. "Quit being so cute," you push on his head playfully before twisting the knob on your lamp for the room to darken and lied back down upon the bed. Not even a second later Kirishima jumped upon the bed resting his entire body across your stomach like a literal dog at bedtime. You almost yelled at him to get lost, that was until you heard the peaceful breaths of air enter and leave his wet nose a long intervals.

"Be lucky I love you," you grinned softly before falling into a peaceful sleep.