So first off, Denki is the light of his life. Literally. He's gotten quite good at refilling batteries for flashlight when on patrol on night shifts.

But he also has this smile that just... makes his day brighten up. Makes life easier. Let's Izuku know that no matter what he's not alone in this world. And the way Denki's eyes light up when he sees him after a day of working opposite shifts just warms Izuku's heart. He's always happy to be reminded that he's not alone in the world anymore.

After his mom passed from an unexpected illness in his second year of high school and then All Might a few months after that, Izuku had no one. His friends could only tell him they were sorry for his loss so many times before he became numb to the words and they no longer provided the comfort they thought the words did.

Then Denki was there.

Denki was there and dragging him to the park to just walk around and get him out of his dorm he holed himself up in.

Denki was there making him dinner, and then having Izuku make them both dinner because Denki was a terrible cook. He had Izuku teach him how to cook, or at least make simple meals without burning them. They found out that Denki actually had a knack for baking later on when he surprised Izuku with a batch of brownies for passing their final exams at the end of second year.

Denki was there making him spar with him, training to make both of them expand their knowledge for when they became heroes in the future. Denki had him take his anger at the world out on punching bags and then hugged him till he stopped crying.

Denki was there making him smile and laugh. Making him forget his anger and sadness even if just for a little bit. Denki was there making him feel alive again. Reminding him that he was more than just a walking, talking pile of flesh and bones. Denki showed him that his world wasn't as dark as it seemed and he was eternally grateful to him for showing him that.

Second off, Denki was just a tad bit touch starved. He had grown up scared to touch anyone and vice versa. His electric quirk was hard to control at times and growing up without anyone coming within a five foot radius of him was hard on the blonde. Not only were his feelings ripped to pieces over it, but the need to be held and touched in any capacity was never fulfilled. The boys own parents rarely touched him outside of emergencies.

Izuku was more than happy to fulfill the boys need to be held. Izuku had very few loving or compassionate touches growing up because of Kacchan and his cronies. So when Denki opened up to him about his childhood, Izuku did the same and together they decided that neither one of them would leave the other wanting for touch ever again. They'd be there for the other whenever needed, no matter the time of day or what the other was doing. They'd stop or drop what they were doing and be there for the other waiting with open arms. So when his long time friend Kacchan finally gave him the apology he'd always wanted to hear, Izuku full on cried his heart out to Denki. Izuku had long since forgiven his old friend for his transgressions of the past but it touched his heart to hear the words. Denki knew that and held him the whole night, not because he felt obligated too because of their silent pact. He'd told Izuku it was because he wanted too, and that was the night they'd shared their first kiss.

It was the best night of Izuku's life at that point.

Before they were even officially together though they were still basically joined at the hip. They held hands everywhere they went. Denki sat in Izuku's lap every chance he got. It was the other way around when Denki had first stepped his friendship up a few notches. Then over the summertime, which over half of the class stayed in the dorms for, Izuku went through a growth spurt he thought he'd never get. I mean he broke all of his bones so many times it should have been impossible right? Well that's what he thought. Then about mid summer, he shot up to Kacchan's height of 5'7 then two more inches by the end of the summer. He ended up at 5'9 for the start of his third year while Denki was at 5'6 with no signs of a growth spurt in sight.

That was fine though, because they found out that Denki fit in his lap perfectly now. Even more perfectly than Izuku fit in Denki's. That didn't mean Izuku wasn't ever held by Denki anymore, oh no, Denki still loved to hold Izuku. He was often seen sitting on top of counters and tables holding Izuku to his chest, passing one hand through his green locks and the other smoothing over his back. They were almost always connected in one way or another. Either it be holding each other's pinkies in class since they were moved to sit next to each other, arms linked at the elbows walking down hallways and sidewalks, or one leaning his head on the other's shoulder. They were always linked. Always together.

And lastly Denki was so much smarter than he liked to show. The only time he's ever truly dumb is when he over uses his quirk, but was something he couldn't control. What he could control though was how people saw him. The little blonde genius used how people thought of him as a weapon. From pranking their classmates and other classes in harmless fun to how he fights villains in their daily life now. He loves how Denki is able to think twenty moves ahead of any opponent and take them down before they even understand what's happening.

It was hot, Izuku could go on for hours about how cool Denki is and then when Denki finally had enough of the compliments and analyzing he'd get Izuku down to about two or three words repeated on a loop. The first time it had happened Midoriya's's voice left him for a full two days afterward. It was unsettling to the rest of 3-A, to not hear the constant mutter from the boy they'd shared a home and classroom with for three years had almost everyone on edge. Everyone but Denki who wore a small smirk and Izuku himself who was beet red and in turtleneck undershirts for weeks to come.

Denki was a quick study in many aspects. So many aspects. So, so, so man-

"ALRIGHT! I GET IT! I'm sorry for fucking asking! I wouldn't have if I knew you were just going to go on a fucking rant! I'll help you dammit! Just DO NOT go into detail or I swear-"

"Fine, fine I get it! But you mean it!? You'll help me!?" Izuku's eyes shine bright in hope and happiness.

"Did I stutter dumb ass? No. Now come on there should be a shop open around the corner." Katsuki rolls his eyes at the way Izuku jumps to his feet and almost falls over. He raises an eyebrow when Izuku stops and cocks his head to the side. "What? Did you pull something when you jumped up? Serves you right, dumb ass."

"No not that. Just," Izuku puts a hand to his chin and scrunches his eyebrows together, "how do you know where the nearest ring shop is? And how do you know that it should still be open?"

Katsuki's face is suddenly hotter than his hands get when he ignites his nitroglycerin and he's in Izuku's face. "Not. Another. Word." His teeth were clenched tightly and he storms past the now taller greenette towards his and Todoroki's apartment door flinging it open to leave.

"Wait! Kacchan does that mean-"

"I SAID NOT ANOTHER WORD!"

Katsuki is storming down the pathway as fast as he could with Izuku trailing not far behind him calling out to him to slow down, but Katsuki ignores him the entire way to ring shop he'd been frequenting for the past month. The two friends had engagement rings to find after all, and the sooner they got there the sooner they could bounce ideas and suggestions off of each other.