Unstable

By: Sisco

Disclaimer: I own none of the characters from My Hero Academia!

A/N: If you do not approve of Izuku/Toshinori, please do not continue reading. Just move on and pretend you never saw this story. However, it will eventually get to Izuku/Katsuki.

Also, any or all grammar mistakes are mine. I do not have a beta reader at this moment. My husband was nominated for the role, but I became embarrassed and decided against it. Lol!

Prologue

Izuku didn't understand the feelings he was harboring for his teacher, Toshinori Yagi, also known as the former hero, All Might. He just knew they were there, and it's been festering for at least a month. It was making his chest ache every time he laid eyes on the much older man.

He found that the ache wasn't exactly unpleasant. It was definitely something new. Something he never experienced when around another man before. His heart would also beat faster, and his face would become red and hot. Was Izuku in love, or was it just a casual crush he felt for his favorite former hero?

"Deku, are you alright?" Toshinori asked when he had noticed the flush rising upon his pupils face, and reached up with his slender fingers to press them against the younger man's brow.

Izuku squeaked softly as he noted how cool the other's touch was. He would have relished how good it felt against his hot skin, but he was obviously flustered and moved away from his teacher's touch hastily.

"I'm fine!" Izuku exclaimed, and flinched at how loud his voice had been. He cleared his throat quickly so to calm himself before staring down at his feet with shame. His whole body was trembling. It almost felt like he was about to pass out. Maybe he actually wasn't feeling well.

Izuku could hear Toshinori's voice calling out his hero name just before he came face first with the hard ground and passed out.

sSs

The air was much cooler than Izuku remembered, and he slowly started to open his eyes; allowing them time to adjust to the bright sunlight filtering into the room. Who's room was he in? The last thing he could recall was standing outside in Toshinori's backyard, while listening to his teacher explain the fundamentals of being a hero, now that he had graduated U.A. It was particularly hot outside for being spring. The heat was what must have made him feel heavy and sick.

Izuku looked around at his surroundings and realized that he must have been in his teacher's bedroom. He blushed scarlet, his eyes widening in shock. "Why here? Why not the guest room?" He muttered to himself. "This is...a little forward."

"Hey, Deku," Toshinori greeted cheerily as he entered the room with a glass of ice-water in hand. "Feeling any better?"

Izuku squirmed uncomfortably in the older man's bed. "Why did you bring me in here? The couch would have been fine." He scolded lightly.

Toshinori chuckled at the younger man's tone before sitting on the edge of the bed. "It's fine, Izuku. It's cooler in here than in the sitting room." He handed the glass of water over and observed quietly as his student took small sips.

"Thank you," Izuku murmured around the rim of the glass. "I didn't know spring decided to take a vacation."

The older man chuckled as he took the glass back from Izuku and sat it down on the bedside table. "Would you like to take a cool shower before coming downstairs for lunch?"

Izuku stared at his teacher quizzically. "Y-You want me to stay for lunch?" Toshinori never invited him to stay for lunch or dinner. This had to be a special occasion.

"You don't have to if you don't want to," Toshinori stated with a knowing smile "Just thought you'd like something to eat before heading home."

The young hero bit down on his bottom lip and gripped the sheets tightly. "Of course I'll stay! I'm glad you asked me!" He realized a little too late he was getting way to excited over something so simple as lunch. Izuku flung the sheets off and rushed to the bathroom down the hall. "I'll be ready in a sec."

Toshinori blinked with a bewildered expression. "What was that all about?" He shrugged it off as Izuku over analyzing things again, and headed back downstairs to the kitchen. Toshinori realized he never invited the young man to stay over for a meal, so it definitely must have been a nice surprise for Izuku.

A quick succession of feet ambling down the stairs made the former hero aware that Izuku was done with his shower, and excited to eat with him. He noted the other's shirt hanging open at the front, and the water dripping down his sculptured chest and abs. He's definitely filled out since high school, Toshinori thought to himself, and a flush suddenly rose to his face. He tried to conceal it with a light scolding. "You should dry off better than that. You'll catch a cold, Deku."

The younger man saw the blush, but said nothing about it and started to button his shirt up. "Sorry. I was in a hurry. I'm starving." Izuku grinned as he sat in the chair across from his teacher at the table. He stared down at the food before him, and realized immediately that it was a Western style lunch; ham sandwiches, potato chips, and sweet, iced tea. Izuku didn't mind this kind of food, but he kept forgetting that the older man was fond of the American lifestyle.

They ate quietly together, which wasn't boding so well with Izuku. His mind kept racing with the thoughts of what happened earlier that afternoon. He had been thinking about his teacher in a lewd manner! They were thoughts that would make even an old woman blush. Izuku started muttering to himself with each bite he took of his sandwich, quite unaware that Toshinori was listening intently

"So that's what happened to you earlier?" The older man snorted, not really surprised by what he was hearing.

Izuku chocked, and started sputtering on his tea. "Was I muttering again?!" His face was beat red as he tried covering it with both of his hands. "I am so sorry! That wasn't meant for you to hear, All Might."

"I know that," Toshinori stated with an understanding smile. "Do you really have those types of feelings for me?"

The young hero let out a muffled whine into the palms of his hands. "Please, forgive me! I don't know why they suddenly started popping up."

Toshinori reached across the table and grasped Izuku's hands. He held them gently, but firmly. "Stop hiding yourself from me, Izuku. I don't mind that you have those sorts of feelings for me. It's actually quite flattering." He chuckled warmly. "However, I don't think I could return your feelings."

"Oh," Izuku murmured somberly. "I really didn't expect you to." He tried to pull away from the other man, but his hands were held fast.

"Don't get me wrong, Izuku," Toshinori started to explain. "It's not because I'm not attracted to you. It's quite the opposite." He blushed faintly. "I'm...just too old for you, and I'm sickly. You wouldn't want to be with a man that's falling apart, would you? Not only that, but I"m not very attractive." He cringed inwardly, hating how he made it sound like he was feeling sorry for himself.

The kitchen table scraped across the linoleum loudly as Izuku abruptly stood, and knocked his chair over in the process. He was staring at his teacher so intently that Toshinori himself thought the younger man was trying to see inside him mind.

"What has gotten into you, Izuku?" The former hero stood, not sure if he should be ready to defend himself, or just accept the consequences that was about to come. His hands were still being held tightly by the younger man, so escaping would be that easy. He yelped in shock when he was pulled forward, their lips smashing together abruptly in an intense kiss. It lasted only for a moment, but the strange sensation that lingered made Toshinori's lips tingle.

"Like I've told you before, All Might, you're not old. And for your information, I think you're very attractive. I want to take care of you, Toshinori. Let me take care of you! I'll love you even after the world ends."

The older man weakened his resolve, almost collapsing to this knees if Izuku hadn't already been grasping his hands. His heart felt about ready to burst as he allowed the other's words to sink in. To be loved so strongly... It was almost too good to be true.

"Izuku," he murmured softly. "I should know better than to change your mind. You've always been so determined to get what you want. That's why I've always been so proud of you." He gasped as Izuku pulled him against his young, firm body, and closed the distance between their lips again. It was gentle this time, and he mewled softly with pleasure. Toshinori didn't think he could get enough of this.

They broke apart again and Izuku lead his teacher back upstairs to the bedroom. The young man's heart was beating so fast; he almost thought it would jump into his throat. He gently pushed the other down onto the large bed and carefully pressed himself between his lover's legs. Their lips and tongues met in a flurry of wet passion. Izuku was moaning as their lower bodies ground against each other; their erections quickly being know to the other. It felt so amazing to the younger hero. He wished he had experienced something like this a little sooner. But sharing this moment with Toshinori was just as thrilling.

Clothes went flying in every direction of the bed until they were both completely naked; their bodies pressed flush against one another.

The young hero kissed his teacher's scar lovingly with warm, wet lips, and felt the slight tremor course through the other's body. He smiled with satisfaction before sliding up and kissing him again.

Toshinori pressed a hand against Izuku's chest. He stared up at him uncertainly. "Have you ever done this before, my boy?"

"No." Izuku whispered sensually. "Can you show me how?" He was panting softly, and his face was flushed, making him look so erotic to the older man.

Toshinori groaned with sexual frustration and reached over into his nightstand to retrieve a bottle of lube. "Pour this onto your fingers and prep me...gently," he added hastily at the end. "I know you want this bad, but you need to take your time or it'll hurt me."

Izuku nodded in understanding as he grabbed the bottle and squeezed the cold gel-like-liquid onto his fingers. He rubbed his digits together, effectively warming the gel up before inserting first one, then two, and three fingers into the older man's tight passage. "You're so soft inside," he murmured.

The former hero groaned and arched his spine off the bed. The fingers curling and spreading his entrance was almost too much for him. He definitely felt like he was getting too old for this. He reached up to grasp his young lover's shoulders, and pulled him down to whisper intensely into his ear. "Put your cock inside me now!"

Izuku's eyes widened in surprise, but he consented to the other's demand. He pulled his lubed fingers out and used what was left on them for his erection. Using a steady grip, he positioned himself at his lover's puckered entrance and thrust his hips forward. It slid in so easily, causing soft muscles to clamp down around him tightly. He moaned and gripped the older man's sides to keep him from squirming. "Feels so incredible, All Might!" Izuku clenched his teeth as he started to thrust back and forth; faster and harder. Long, cool fingers came up to cup Izuku's face, and then moved up to entangle into his thick, green locks. "Toshi..." He moaned softly.

The older man pulled this lover down and kissed the bridge of his nose. He could feel the warm, flushed flesh under his lips, and started to move his lips further down to Izuku's neck. He nibbled and licked at all of the sensitive spots; enjoying the mewls of pleasure escaping the young hero's throat. He then moved down to Izuku's collarbone and bit down gently, leaving a shallow bite mark.

Izuku gasped at the slight pain before giving one last thrust and spilling his seed deep inside his older lover.

Toshinori could feel Izuku's hot cum fill him and spill out around the softening shaft still inside him. He took that short moment to regain his breath before Izuku planted his lips firmly against his own. He was also faintly aware of his own cock still hard, and rubbing desperately against the other's stomach.

"You haven't come yet?" Izuke stared down at his teacher apologetically before sliding down his lean frame and taking the erection into his mouth. He didn't know what he was doing, but he hoped his enthusiasm made up for the lack of experience.

The older man obviously didn't care how it was dealt with. Feeling the hot, moist mouth around his dick was heaven. He tugged lightly on the green locks, wanting Izuku to suck harder, and swallow his shaft deeper. When he received the necessary attention he was wanting, he groaned and started to shallowly thrust his hips.

"Just...a little...longer, Izuku, ...my boy." Toshinori's voice was thick with lust, and his grip on the young man's hair became tighter; indicating he was close to his release.

Izuku slid the tip of his tongue through the slit, tasting the precum dripping there. He heard a loud gasp just before his mouth was filled with thick spurts of hot cum. He swallowed it greedily and licked the softening shaft clean.

"You didn't have to do that," Toshinori murmured with embarrassment. "It must have tasted awful." He sat up slowly to pull his lover close and kiss him tenderly. He could taste his own cum still on the other's lips, which didn't taste as bad as he assumed. He heard Izuku chuckle softly before he was pulled back down into the sheets with the young hero.

Despite how hot it was outside, Toshinori couldn't help but notice how pleasantly warm it was with the taller man wrapped around him. He nuzzled the bite mark on Izuku's shoulder and kissed it apologetically. He listened carefully to the other's breaths evening out, indicating Izuku had fallen asleep.

Toshinori untangled himself from the younger man's grasp so he could head down the hall to the bathroom, and shower. He stared up dazed at the shower-head. This all had to be a dream. Why would anyone like Izuku want to take care of an old man like him? With a sigh and pressed his forehead against the tiled wall; the cool feeling made him feel at ease.

He flinched when the shower curtain was suddenly flung open and Izuku stood there in all his naked glory. "Izuku!" The former hero exclaimed. "W-What are you doing?"

Izuku gave his lover a predatory sneer before grasping the other's thin wrist and pulled him forward until they were nose to nose. "Naughty teacher, leaving me all alone in bed."

Toshinori blushed before losing his balance and falling into the younger man.

"I told you I'd take care of you," Izuku murmured fondly. "I'll never let you fall." He buried his face into the shorter man's blond, wet hair and smiled contentedly.

To Be Continued...