Weasley twins

You were in your fifth year at Hogwarts and, unlike many of your classmates, you particularly excelled in Potions. You paid attention to every one of Snape's instructions, measured ingredients with precision, and rarely made mistakes. That skill made some students feel jealous.

During a class, while you were carefully preparing a potion, one of your classmates dropped—apparently by accident—an ingredient too close to your cauldron. The ingredient fell into the potion and, in a matter of seconds, it reacted violently.

BOOM!

A thick cloud of smoke covered your workspace. The students began to murmur and Snape approached quickly, trying to discover what had happened.

Snape: —Oh…

When the smoke began to clear, Snape discovered something completely unexpected. The explosion hadn't hurt you, but a strange magical reaction had caused your body to transform into that of a baby.

Snape, visibly surprised, examined the situation and began to look for a way to reverse the effect. However, preparing the cure would require time and certain ingredients that were not immediately available.

Since he couldn't leave you alone while he worked on the antidote, Snape looked toward the two seventh-year students who were nearby.

Snape: —Weasley. Weasley.

Fred and George approached, still trying to hold back their laughter at the situation.

Fred: —Yes, Professor?

Snape: —You two are going to take care of him/her until I find a solution.

The twins looked at each other. For the first time, they seemed to be completely speechless.

George: —Us?

Snape: —Yes. And you had better not pull any of your usual stunts.

Fred raised his hands with an innocent smile.

Fred: —We would never do such a thing, Professor.

George carefully picked up the little one while Fred gathered your things.

George: —Come on, little one. Looks like we'll have to take care of you today.
(they were already your boyfriends)

They're your boyfriends, so they'll take care of you with love but also with humor.