Requested by EhLevi

one for all had no idea how he got into this situation

he was being kept prisoner in the highest facility prison in japan

he was eating his daily glop for food

but then he felt a crunch in the usually smooth mash

before he knew if his body was changing

and suddenly he was in the form of a Neapolitan Mastiff dog with the size of a grizzly bear

although odd

it was an advantage

his restraints were no longer as tight and he was able to slash himself free

he had run from the prison and was heading his way to shigaraki and the league of villains

that was before a beastly tattooed man had attacked him and leashed him

he was soon entered into a dog fight

he had won but he was hurt and bleeding

but the humans didn't care as long as he kept raining in money

but one day he was too weak to finish a fight and lost

the tattooed man tied him up in a dark alleyway with a strong silver chain

and now he was waiting for death to overtake him

"oh my god" he heard a young male voice call out

he didn't have enough energy to see who it was

he wanted to sleep

but after 10 minutes a series of close footsteps put him on alert

"Hey boys, it's ok, it's ok" the same voice reassured

the smell of fresh meat was placed close to his noes

he used all his energy to look to where the smell was coming from

he saw a dog bone and a bowl of dog food in one hand while the other held a bowl of freshwater

looking up he saw that those hands belonged to a raven headed student, looking reassuring and friendly towards him

"you must be starving help yourself," he said as he lowered the food and drink to him

he was so hungry he didn't care that it was dog food

the student moved to let him eat but was heading behind him

one for all gave a growl of warning

but raven head continued to soothe him

"it's ok, I'm just going to get rid of these nasty chains of" he explained

the weight of his back was evidence of this as the raven cut the chains of his body

one for all could feel his energy come back in full swing

"there you go, your free now," the student said happily

one for all simply stared at the bird-headed boy

this child had just saved his life, out of his own free will and wasn't looking for any type of reward

it was rare that these types of people existed

one for all knew he couldn't just leave him

he needed to repay him for his kindness

it might have been his dog brain talking (he was having a hard time from acting like his usual self and a usual dog)

he began following the boy

the raven looked at him in surprise, saying that he was now free and he could go now

but one for all simply stayed close to the boy

with a sigh, the raven crouched down to meet him eye level

"well I guess it would be irresponsible of me to just leave you on the streets, I can't take care of but I bet once we clean you up, we'll be able to find you a family that can," the raven said

but one for all wasn't paying attention as the student patted his head, defiantly his dog brain talking

"how we going to get past the teachers and our classmates, this big slobbery mess is huge!" a new demonic voice said aloud

overhaul noticed a wispy dark shadow creature look at him with menacing eyes and a form of shadow claws that were in an arm folded way

"I'm sure it will be fine, It'll just be until we find him a new family, all he needs is a little soap and a lot of love," tokoyami said, although not paying attention to his...one for all wanted to say quirk, as he scratched his chin

the quirk simply huffed and went back inside its host

"come on boy, follow me," he said, patting his knees as he walked back to his school

one for all followed excitedly

but his excitement soon turned to shock as the student was about to enter the UA school

but it would be suspicious if he stopped following now

and now he would be able to infiltrate the hero's teaching grounds underneath the teacher's noeses

"let me guess, it followed you home and now you want to keep it" kiminari teased as the named tokoyami (one for all found out when the students had started talking to him) brought the massive dog into the dorms

the students were shocked at the sight, and now they were either teasing tokoyami, trying to pet the dog or trying to get as far away from the dog

"yes it did follow me home, but I'm not going to keep him, I'm going to phone a shelter to find a permanent home for him" tokoyami explained as he continued to stroke the dog

the other students had tried but one for all wouldn't let them, only letting tokoyami pet him

the students had declared that the teachers were on their way

and suddenly the big dog felt himself change

(the pill must be wearing off) one for all thought scaredly

"what's wrong boy?" tokoyami asked, sensing something was off

one for all simply looked at the raven head

he gave a big slobbery lick to the raven's cheek and ran out of the dorms, running out of the schools ground and into a safe place so they wouldn't be able to track him down

one for all was back into human form, but he didn't forget the events that happened during his dog days

he was able to make his way back to the league of villains who welcomed him back with open arms

but although back just a day

he was making plans of their next attack

"there's a student that shows great potential and kindness that the heroes will misuse for their own gain, we shall retrieve him and save him from their grasps" he declared, to which the league cheered their leader on

one for all made an oath to himself

(do not worry tokoyami, I will repay my debt)