You and Bakugo are twins but your parents died so the two of you live alone. One night he brings the Bakusquad home for a sleepover unannounced. You have a huge crush on Kirishima, Bakugo (your twin) knows this.

"Oi "your name", the squad is here they're sleeping over!"

She gets immediate butterflies because she knows Kirishima is part of the squad.