AU where Izuku's dad is AFO & Izuku was taken into Aizawa's care as a child. (COMMENTS)
Aizawa, glaring at a 4yo Izuku that's squirming: Will you just-
Some rando: Hold on, young man! What is it you think you're doing with that child!?-
Aizawa, with a still squirming Izuku, tilts his head up to look at rando, glaring: Is this your kid?
Rando: No, he's not, but-
Aizawa: Then shut up.
Some rando: Hold on, young man! What is it you think you're doing with that child!?-
Aizawa, with a still squirming Izuku, tilts his head up to look at rando, glaring: Is this your kid?
Rando: No, he's not, but-
Aizawa: Then shut up.
FURTHER EXPLANATION OF THE AU
AFO killed Inko when Izuku was young in order to take him into his custody, but Izuku thinks she's overseas for work. AFO trains Izuku vigorously, and eventually, All Might learns of Izuku's presence within AFO's home (before the sludge villain attack) and eventually rescues him with a teenage Aizawa & Hizashi. (1/2)
Aizawa took Izuku into his care, and in this scenario, he's getting Izuku from daycare, but he wants to stay with Katsuki, which is why he's squirming. (2/2)