You or (crush) gets hit with a flirting quirk so whenever they talk to you or you to them all they do is flirt!

The basics of this is a student in a lower class decided it'd be funny to cause some 'romance stuff' to happen in class 1-A

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For Nova she'll be hit with the flirting quirk and start flirting with Todoroki

Or if J use Lyra

For Lyra, it will be Izuku who gets hit with the flirting quirk