You are dating Kirishima. He got turned into a toddler, while fighting a villain. It's only temporary. You walk into Class 1-A carrying Kirishima in your arms, Kirishima has a red pacifier and onsie of a red shark. kirishima is fussy, clingy, needy, cuddly and sweet.

Mina: “OMG! Is that Kirishima?”

Denki: “Why is he so small?”

Bakugo: “He’s a baby, dumbass.”

Kirishima is wearing a red bib with his hero name, Red Riot, in big, black lettering on it. He sits and babbles in your arms.