Warning: the title tells what is the content, but if you want a clear explanation, SEX UP AHEAD, DUDES!
Eros kai Storge– Erotic and Affectionate Love
Izuku Midoriya is at home. He just got home from his dormitory for the summer, and he has nothing to do other than answer his summer homework. He is deep into it when someone knocked on their door. His mother is out shopping, so he answered it.
Katsuki Bakugo, his childhood friend and lover, is standing at the doorway, looking impeccable. He let himself in and went directly to Izuku's room, having known his way around. Izuku, curious, went after him.
Katsuki is sitting on Izuku's bed, besides him are two items that Izuku hasn't noticed: a small box and a bottle. Izuku picked up the box and nearly dropped it as he gasped, it was a box of condoms. He eyed the bottle and, deducing from the box in his hand and from the way Katsuki is looking at him, he deduced that it is a bottle of lubricant. "K-katsuki… What are these?" he asked.
"Oh? I think you know what those are, Izuku," Katsuki said, licking his lips sensually. "And I think that smart noggin of yours understand what I want."
"First, a question, where do you bought these? We're minors."
"I have my ways," Katsuki said, standing up and taking the condom from Izuku. "Now, shall we do it, or should I force you and hmm… 'rape' you?"
Izuku blushed. "No need to be harsh, Katsuki. If you want to have s-sex with me, then you just have to ask."
Katsuki smiled, then kissed Izuku. The other wrapped his arms around Katsuki and pulled him to the bed. Izuku broke the kiss, red and gasping for air. He stretched out his hand and lightly touched Katsuki's face, then said, "Please be gentle with me. It's my first time."
"Same here," Katsuki replied as he took Izuku's hand and kissed it. "But don't blame me if I will be rough. You're just too damn cute."
Katsuki slowly removed Izuku's shirt, taking in the well-toned body of his lover. His eyes hovered to the heavily scarred arm of Izuku, before he moved his eyes down to the other's groin and pulled his shorts and underwear down. He chuckled as he saw that Izuku is already erect. "Hasty little bitch, you really wanna get fucked, huh?"
Izuku covered his face, which was red as a tomato. He said something, but because his hands are covering his face, it came out as a grumble. Katsuki removed the hands from Izuku's face and the other repeated his words. "It's your fault, Katsuki."
Katsuki raised an eyebrow. "My fault? I didn't do anything yet, yet here we are."
"Let's just get this over with, please," Izuku said, not meeting the other's eyes.
Katsuki shrugged and knelt down. He took Izuku's member and took it into his mouth. Slowly, he bobbed his head up and down, using his tongue to tease the head of Izuku's member.
Izuku's breathing became ragged as Katsuki continued with what he is doing, and he gasped when he felt something intrude his anal hole. He looked down and saw that Katsuki has inserted a finger inside him, and, being knowledgeable in anatomy, Katsuki easily found Izuku's prostate.
Izuku felt like he is about to ejaculate, his body tensing up, but was not allowed to do so because Katsuki stopped. Izuki glared at Katsuki, but the other is already stood up and started to remove his clothes. The glare and anger disappeared and was replaced by adoration as Katsuki made a display of stripping down in front of Izuku.
"Like what you're seeing?" Katsuki asked as he stood in his full glory, in his face is a smirk and his member throbbing hard. Izuku nodded slowly in response, not noticing his open mouth or the drool that started to leak out of his lips.
Katsuki took the box of condom and took one pack. He tore the pack open with his teeth and threw it at Izuku. "I think you're smart enough to put it on me, right?"
Izuku moved as if animated; he took the pack and extracted the condom. He slowly inched towards Katsuki and placed the condom at the other's member. He took the bottle of lube, opened it, and slathered some on Katsuki's member.
"My, what a good little boy you are," Katsuki said. "Now, let's start the real fun."
Katsuki lifted Izuku up and placed him on the bed properly. He kissed Izuku slowly and passionately as he entered him. Katsuki started to moved, making Izuku moan.
"You like that, Izuku?" Katsuki asked as kept on pounding.
Izuku nodded fervently. "Yes, Katsuki!" He extended his arms and pulled Katsuki for a kiss.
Katsuki kissed back beffore pulling out. He lifted Izuku and flipped him before continuing to pound him missionary-style. After a few thrusts, Katsuki ejaculated inside Izuku, and, to make it even for them, he grabbed Izuku's member and jacked him off, staining the bed.
The two of them continued having sex for a few more times before the two decided to rest. Izuku was so tired he promptly slept, his head laying on Katsuki's chest.
Meanwhile, Katsuki is playing with Izuku's hair, humming to himself. He looked down at the sleeping teen and said, "You're so fucking cute, you know? Man, even if I was a bully to you, you still fall in love with me. I wonder why is that."
"I didn't plan to, actually," Izuku said, his eyes still closed. "But I dunno why I fell in love with you. Maybe because when you started caring for me again, like when we were kids, triggered the hidden feelings I had when we were kids. Now, the question is, why did that friendship turn to affection for you?"
Katsuki tugged at Izuku's hair slightly. "When are you up?"
"Just now," Izuku replied. "Hey, you're dodging the question. When did friend turned to bully turned to lover?"
"I'm sorry, okay, but you just infuriate me," Katsuki said. "You act like you can do shit even though you don't have the power to do so, which infuriates me."
"Wow, I really didn't get that that time," Izuku said sarcastically.
"Wow, sarcasm, the little baby is growing up." Katsuki smiled and kissed the top of Izuku's head. "I dunno when it turned to love though. I think it just developed over time, seeing you strive to what you become to be, I liked that."
"But that doesn't explain why you love me."
"I just love you, okay? Now stop asking questions and get ready for another round."
Izuku chuckled and kissed Katsuki on the cheek. "Yes, sir."
Years after…
After finishing high school, Izuku Midoriya became a sidekick for a hero before starting his own agency. He became one of the most successful heroes of Japan, becoming a celebrated hero in his young age. But with all of the adulation and stress of the hero world, he is still the same person that he is: still the same kind-hearted person who is still in love with the same person.
Katsuki Bakugo is also one if the most celebrated heroes, even though not as much as Izuku, but he has changed for the better. Now a more mild-mannered person, he has become almost like his mother, still brash but now a kind person.
Izuku and Katsuki have been together for all those years since high school, and are still very much in love with each other. The two have moved in with each other, and are working at the same agency that they made together.
Everything might change, but their love for each other will never waver.
-Eros kai Storge End-
A/n: "Eros was the word often used to express sexual love or the feelings of arousal that are shared between people who are physically attracted to one another. Meanwhile, storge refer to the love between married partners who are committed and plan to have a long relationship together, particularly as a fundamental relational foundation after initial infatuation."