Embarrass her

You feel a flash of coldness, you know she'll never love you like you love her and no amount of special powers is going to change that. You could at least have some fun.. you walk slowly across the yard, staring at her as you approach. She's dressed in a tight pair of jeans and a long-sleeved open shirt, which is above a tshirt. You grab her shirt and pull it off, you hold it up in the air for a second and let go of it, time holds it still as soon as you let go allowing it to suspend miraculously in the air. You then grab her tshirt and rip the front of it, splitting it straight down the middle, revealing her small chest. You grab one of her nipples, squeezing it as you stare into her icy blue eyes, before kissing her lips. You make sure her tshirt is spread open sufficiently wide before walking back across the yard, somewhere to get a nice view. You unfreeze time. Melissa instantly squeals, grabbing her tshirt she awkwardly pulls the two halves of it together. Her long-sleeved shirt is blown by the wind into the back of her head, catching her by surprise she lets go of her tshirt again as she flaps about trying to grab the other shirt. Her friends stare wide eyed, one of them suddenly giggles whilst the others try to help Melissa. A small crowd begins forming around her, she curls up on the floor and you can hear her sobbing.

Friend 1: Who did that!?

Melissa's friends help her up, covering her with one of their jackets and wrap it around her, they lead her into the school slowly. You feel slightly guilty, but watching Melissa get embarrassed like that was kind of a turn on for you..