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According to Aizawa, it's a very important aspect of the hero life to learn to trust each other; that's why they end up in pairs that day.
Izuku finds himself training with Todoroki while Bakugo glares at them from the other side of the gym; he's determined to treat Izuku in a more friendly way now, which is why it confuses him at first his insistence to glare at them like he wants to punch something.
He quickly forgets about it though because he needs to focus on the training exercise. At some point Todoroki and Izuku have to coordinate their attacks and movements; Izuku lets himself fall and Todoroki grabs him by the waist (using his ice to move himself up and catch him midair) to put him back on the ground safely.
"Thank you!"
"No... problem," Todoroki mumbles, cheeks turning slightly pink in seconds; he looks flustered.
Izuku tries to move, but feels the grip of two hands still on his waist. He wonders why Todoroki hasn't released him yet.
"Uhh... Todoroki?"
"Yes?"
"Your hands..."
"Oh, right!" He moves them away quickly as the blush on his face spreads down his neck. "Sorry!"
"It's okay, don't worry."
However, the boy with mismatching hair seems to be distracted for the rest of the session, he keeps looking down at his hands every now and then before glancing shyly at Izuku.
"Todoroki, are you alright?"
"You have a small waist," he blurts out suddenly. Izuku is not sure if it's a compliment or not until the boy adds: "I like it. It's like it was made for my hands..."
For a moment, Izuku doesn't know what to say to that so he just looks at Todoroki; it takes a couple of seconds for him to realize what he just said, but when he does, the left side of his hair bursts into flames; he makes them vanish by running his fingers through his hair.
"Did I say that last thing out loud?"
"Yes," Izuku nods, but smiles at him: "It's okay though! You mean that we can use this to our advantage during a mission, right? I'm glad you're already thinking about that!"
"Yeah, that's... exactly what I m-meant."
"Great, now let's keep training!"
***
It doesn't end there though; Todoroki keeps grabbing him by the waist even if they're not training (perhaps he just wants to get used to Izuku's weight in case they need to coordinate their attacks again).
"Let me help you, Midoriya!" He always insists, before grabbing him by the waist to sit him on the couch or lift him enough for him to grab a book on the tallest shelf. One day he takes him by the waist because Izuku is walking in the opposite direction to where they want to go and turns him towards the right one.
"You could've just told him," Uraraka points out with amusement.
"Didn't think about that, sorry," Todoroki mumbles, but he doesn't look like he's sorry at all.
***
Everyone notices and Bakugo starts getting angrier and angrier until he decides he's had enough of that.
"Why is half and half always touching you?"
Izuku realizes he's making an effort not to yell, even though he's clearly pissed, although he has the feeling that his anger is only directed at Todoroki for some reason.
"Something about my waist being small... I think," Izuku mumbles, still not so sure. "I think he just wants to get used to my body weight in case we need to do something like that in a mission."
"HA?" Bakugo's eye twitches in a funny way before he says: "I'm going to fucking kill him! That's bull..."
He doesn't finish the sentence though; an idea seems to be forming in his head as he looks down at Izuku.
"What if I'm the one who has to go on a mission with you?"
"You're right, Kacchan! Do you want to try? I mean out of the two of us, I'm the one who's easier to carry in case of an emergency..."
Bakugo nods, although he looks speechless for a moment. His hands tremble a little before he puts them both around Izuku's waist. However, he lifts him like he weighs nothing.
When he puts him back on the ground a blush appears on his cheeks, but he doesn't let go.
"You do have a small waist, Izuku..."
"That's what Todoroki said! Perhaps we can use the fact that I'm easy to carry to our advantage somehow..."
"I'll definitely use it to my advantage," Bakugo whispers before a smirk quirks the corners of his lips up. "I just remembered that I have to do weight lifting today, would you help me, Izuku?"
"Of course, Kacchan! What do you want me to do?"
***
Todoroki doesn't like it when he finds out Bakugo has been using Izuku instead of weight plates for his daily training.
Izuku doesn't mind, it's kind of relaxing, besides, Bakugo is always very careful when he carries him around.
"It's my turn."
"FUCK OFF, HALF AND HALF!" Bakugo growls, pulling Izuku closer to him when Todoroki walks in the gym that morning.
The green haired boy sighs; he's getting used to their flights at this point, even though he doesn't like to watch them argue.
"I think you two should start using weight plates again..."
"NO!"
At least that's one thing they both agree on...