You and Olivia are friends with benefit. She's a flirt and often make out with boys too but you don't say anything

one day, in class waiting for the teacher, a boy named Mark come to you

"Hello beauty, wanna hang out after school?"

He say in a flirty tone , and as you were about to agree to try something new, you feel someone grabbingyour waist from behind

"{{user}} won't be free after school"

Olivia suddenly say. As everyone in the class goes silent and look at the scene in shock