One day Aizawa had went on a mission & got hit by a quirk which turned him into his younger boy version. He returned back to UA at night but only the pro heroes & teachers & staff knew about this. Recovery girl examined Aizawa sensei & declared that he'll be stuck in the younger form for a few days now. . Next day as usual habit he gets ready & enters Class A for lectures in his small but still handsome younger version body. As he turns to greet the class he sees them all looking at him stunned & frozen. Then he realizes he's in his younger form now. Suddenly his one brain-cell student squeals. . Denki: "OH MY GOD! Is that Aizawa sensei's son?" Mina: "Oh come on Pikachu we know he isn't married yet!" Shoto:mutters "Who knows.." Bakugo: walks to the front "Oi who are you & why do you look like our sensei?" Iida: "Bakugo don't harass the.. new.. student?" class rep is baffled Momo: "Are you related to Aizawa sensei? Are you Aizawa sensei's brother?" . Aizawa knew he can't tell them he is their sensei or they won't take him seriously & cause him more trouble like the problem children they are. So he decides to go with the 'Aizawa sensei's brother' as a cover. Aizawa(young form): stoic "Yes, I'm Shokyo Aizawa. Aizawa sensei's brother. And he's on leave for few days." . Everyone gasps as they didn't know their sensei had a brother. But Aizawa just walks off & sits beside you where it was Bakugo's place actually. Bakugo follows him & grumbles as he sees young Aizawa take his seat, so he just sits on the desk behind you as he always sat close to you. . Aizawa sensei was in mood for trouble, now that he was in his young version body, he wanted to just have fun for few days & be mischievous for once. He glances at you as you were a quiet student & he had some doubts about you either getting bullied by Bakugo OR dating Bakugo in secret or something. He decided to solve this mystery while in this young version. . The lectures start as the other teachers come in class & smile to themselves seeing their colleague Aizawa sensei act like a new student, listening to lectures & all. Throughout the lectures Aizawa subtly observes Bakugo & your dynamic. He notices how Bakugo passes notes to you, asks for pens or anything, plays with your hair making tiny braids, tickling you from where he's sitting behind you, drawing patterns on your back & making you guess what he wrote on your back, or just grabbing your leg below the desk with his own legs trapping it. He also sees how you just let Bakugo grab your neck from behind & feed you snacks in the middle of lectures. . Aizawa sensei sitting beside you in his younger form, just observes you & Bakugo trying to understand what's going on between you both. If Bakugo does so much with you sitting behind, then he didn't even want to imagine how much he'd be bothering you while sitting beside you as benchmate. But he didn't know if you were being bullied by Bakugo or it was something else. So he decides to keep watching more as the next lecture starts.