Everything had been going fine. It was beautiful day and some of the students from Class 1-A had decided to head into the city to have some fun. Too bad it was ruined when a small group of villains decided to make their appearance.

"What's the matter little heroes?! Don't care for the "icy" reception?!" called out the villain. He had blue skin and his hair was made of ice that was slicked back into spikes. He wore a trench coat that was left open, a pair of slacks, no shoes, and wore a pair of large metal gauntlets that amplified his Quirk. "Come on! Let me freeze you already so I can meet back up with my friends! If you're lucky, maybe they'll bring your friends as well!

Hiding behind a nearby building was Midoriya Izuku, listening to this madman's cackles. When the villains attacked, he and the rest of the 1-A students had become separated from each other. Well, almost. Izuku glanced to his side at the girl, whose large eyes glanced right back him.

"Any ideas, Midoriya-kun, gero?"

"Not at the moment, Asui."

"Call me, Tsuyu, remember?" replied the frog girl. Even when dealing with villains, she had to remind him.

"S-Sorry! Anyway, as of right now we're pinned down. The only options we really have are to wait out for a Pro to come…"

"Which we don't know how long we have until then, gero."

"…Or take the risk and fight this villain ourselves."

"…You know I'm not suited for the cold, Midoriya-kun."

Izuku nodded his head in confirmation. "Which is why I was going to fight this guy by myself."

Tsuyu's expression didn't change but Izuku could somehow tell that she was not happy with that decision. "Midoriya-kun…"

"Asu-Tsuyu, I think these villains separated us on purpose. From what little I saw of the others' Quirks, they could specifically counter some of our Quirks."

"So it's not just a coincidence that we got stuck with an ice user, gero."

"Either these guys are working with the League of Villains or they really did their homework to make a name for themselves," replied Izuku, glancing back towards the villain who was still looking for them. "With your cold blood and the fact that I have to get close to attack, we're technically at a disadvantage."

Tsuyu nodded at this. "We are, but that doesn't mean you deal with this on your own, gero."

The green-haired boy turned back to her with wide eyes. "B-But…"

"Remember, Midoriya-kun, I'm training to be a hero as well, gero. I wouldn't be able to call myself a hero if I stood on the sidelines because I was afraid of getting hurt, gero."

Izuku stared at her for a few seconds before nodding at her conviction. "Alright. I'll distract him and you attack from above when I give the signal."

"Right."

With that, Tsuyu started climbing the building they had been using for cover while Izuku dashed out to the open.

"Ah! There you are!" exclaimed the villain as he shot an icy blast. Luckily, Izuku was able to dodge it using a small amount of One for All in his legs.

"Why are you doing this?! Who are you?!" demanded Izuku as he stared down the villain.

"The name's Frostbite," replied the villain with grin, revealing sharp teeth that glistened like icicles. "As to why we're doing this, well why not?!"

Izuku grimaced as Frostbite cackled once more. So there was no real rhyme or reason for what these villains were doing. Still, it was strange that they were coordinated enough to separate the UA students, which means that the League had to have been involved somehow. He had to take this guy down and get answers.

Using One for All, Izuku charged forward. Seeing this, Frostbite grinned and fired another icy blast, causing Izuku to quickly change directions. He kept running as Frostbite kept firing.

"Damn it!" growled out Izuku, getting annoyed that he couldn't get closer.

When the shots stopped, it allowed Izuku to catch his breath and stare down his opponent once more. From what Izuku could see, there was an icy aura surrounding Frostbite.

"What's the matter, little hero? You didn't actually think I'd let you get close to me, did you?" questioned Frostbite in a taunting tone. "Even if you did get close enough, you'd freeze the moment you touched me!"

'So that aura is a defense!' thought Izuku.

"Not only that, but with my Quirk I can also lower the surrounding temperature!"

That made Izuku tense. Now that he had stopped running, he could feel that it did feel colder than it did earlier. And if it was colder now, then that meant…

'Tsuyu!'

The freckle-faced boy desperately looked at the tops of the buildings to find his friend. He soon spotted her, but with the way she was starting to sway his fear grew.

"So that's where your little friend had been hiding," stated Frostbite with a smirk as he too looked at Tsuyu. He had noticed Izuku's frantic search and he looked up to where the boy was looking.

It didn't take long for Tsuyu's body to give out and she fell forward.

"Tsuyu!" exclaimed Izuku, activating One for All once more.

"Say goodbye, heroes!" shouted Frostbite as he took aim.

'I need to make it!'

The villain fired off one last shot just as Tsuyu was about to hit the ground. Luckily for the frog girl, Izuku made it just in time to catch her, with his momentum carrying them both inside the abandoned building. Unfortunately though, Frostbite's attack froze over the entrance, effectively trapping the green duo.

"Damn, I was hoping to give them a quick death," said Frostbite with a frown. He then shrugged. "Oh well, at least they'll still die. Better go see if the others are done yet."

With that, the icy villain walked off to find his teammates.

-:-

Izuku let out a moan as he shook his head. What happened? His eyes sprang open when he remembered.

"Tsuyu!"

Looking down at the weight in his arms, he let out a sigh of relief to see her safe and sound. Aside from the fact that she was out cold (no pun intended), she seemed to be okay. Setting her down gently, he turned towards the entrance to find it blocked by a thick sheet of ice.

"That explains why it still feels cold," mumbled out the boy. "It feels like it's getting colder, too."

He needed to figure out a way out of here, especially for Tsuyu's sake. He couldn't use One for All. Looking at the way the ice formed, using his Quirk could causing the building to collapse on top on them.

"I-Izu…"

The sudden voice startled Izuku out of his thought process. Turning to the source, he found a slightly conscious Tsuyu staring at him through half-lidded eyes.

"Tsuyu!" exclaimed Izuku as he rushed forward. "Are you okay?!"

"…Cold, gero."

"R-Right! Stupid question. A-Anyway, it looks like we'll have to wait for someone to find us before we can get out of here."

"Mm," moaned out the girl before closing her eyes.

"T-Tsuyu! Stay with me!" exclaimed the frightened boy as he started to shake her. "Oh no, if she stays in here any longer she'll most likely freeze to death! I have to warm her up somehow!"

Looking around the room, Izuku noticed various pieces of debris; pieces of wood, concrete, cloth, metal. Not wasting any time, Izuku quickly gathered all of the wood, concrete, and cloth. Putting the concrete into a ring shape, he then placed the wood and cloth in the middle. Striking two pieces of concrete together to make sparks, he was happy that the fire was soon lit.

"Good, that's done," said Izuku with a sigh as he could feel the heat emanating from the fire. He looked back at Tsuyu to find her still out of it. "But there has to be something else I can do!"

Wracking his brain for anything that could help his friend, his mind soon landed out a piece of information that made him blush bright red. It was something he saw in a documentary once and would never have believed that he would ever have to use it. Being the shy boy that he was, he would never do something like this willingly, but his embarrassment was pushed to the side due to his worry for his friend's life.

"Please forgive me, Tsuyu!"

Quickly, Izuku stripped down to his boxers before turning to Tsuyu and stripping her down to her bra and panties. He blushed when he noted that they were green. Not wasting any more time, he picked up Tsuyu, sat by the fire, placed her in his lap, and grabbed the largest piece of cloth he could find and wrapped it around them as a makeshift blanket.

'Hopefully someone finds us soon,' thought Izuku, his face still red. His blush became deeper when he felt Tsuyu snuggle up against him.

-:-

Izuku had no idea how long they had been trapped. Despite having been awake the whole time (his worry for Tsuyu making sleep impossible, no matter how much the cold wanted to claim him) he lost track of time. For all he knew it was well into the night, which would have meant they had been trapped for hours since it was the early afternoon when the incident occurred.

Just as he put another piece of wood on the fire with his free arm, his other arm securely around Tsuyu's waist, he felt a source of heat coming from the entrance. Looking up, he noticed the ice starting to melt as a large orange blotch getting bigger. Once the ice melted, creating a makeshift doorway, it was revealed that Shouto was standing there. The dual Quirk user's eyes widened when he spotted Izuku and Tsuyu.

"I found them!" shouted Shouto, turning back to the outside.

Izuku let out a sigh of relief when he heard the voice of his friends, all concerned for him and Tsuyu.

"Deku! Tsuyu! Are you okay? Oh!"

Ochaco was the first to make it inside and when she did she stood there wide-eyed when she took in the scene. From her perspective, Izuku and Tsuyu were naked underneath the blanket. Why were they naked?!

"Midoriya! We've been looking all over for you!" cried out Iida, who was the next to enter. Upon seeing his friend, he tensed up and was about to reprimand the boy as his class president mentality overrode any other thought. Luckily, Izuku interrupted before the reprimand came.

"Call an ambulance! Just call an ambulance!"

Sensing the distress in the boy's voice, Iida closed his mouth and quickly fished out his cellphone and stepped outside. Shouto and Ochaco went towards Izuku and Tsuyu to help them out of the building. Helping Izuku stand, Izuku made his way towards the entrance with Tsuyu still in his arms and keeping her close. Shouto stood by them using his fire Quirk to keep them warm and Ochaco gathered up their discarded clothes. She was relieved to find that they were at least still wearing their undergarments.

It didn't take long for an ambulance to arrive. Wrapping the blanket around Tsuyu, Izuku handing her over to the medics, begging that they help her.

"Don't worry, kid. We'll do everything we can," said the medic, giving a reassuring smile.

"…Thanks," replied Izuku, returning the smile.

Now knowing that Tsuyu was in good hands, Izuku allowed himself to relax…which meant to fall forward in a dead heap and his friends to shout his name in shock. He was unconscious before he even hit the ground.

CHAPTER END

-:-

I've wanted to write an Izuku x Tsuyu fic for a while now. It's such a great pairing, but doesn't get a lot of stories for it. Of the Izuku pairings (the ones that matter) I feel it works the best given their personalities and doesn't feel bland or forced (like Izuku x Ochaco).

Anyway, this story will probably have quite a few chapters that show off the growth of Izuku and Tsuyu's relationship. So stick around to see more of the glorious pairing known as "Frog for All".