Take advantage of her privacy

She didn't think she could do anything until she relieved some pressure. So she decided she would stay in the empty classroom for a little bit.

Anna pushed the trashcan back out of the way. She pulled and twisted herself to get out of her hiding place. Lust driving her.

She tries to pull herself out from behind the desk. But it seems too tight. She realized she might be stuck. And then another horrible thought crossed her mind, one of someone needing to help her get out, in her current state of dress. That thought put her in a very strange place of fear and arousal. She almost wants to just try and masturbate here. But the lack of space would make it difficult. She twists and turns again. Still stuck, but now she's managed to push the back of her shirt all the way over her head.

Persistently pulling, Anna manages to get a leg onto the desk. Then she reaches her second leg up. Wait, what was the plan here? Now she's just upside-down with her front stuck to the wall. Anna was making a bizarre sight with her legs sticking out from behind the teacher's desk. There would be no way to explain what was going on to anyone if they were to see her now. With her legs following behind her in an almost bridge like position, but with her torso behind the desk. The thought of how exposed between her legs would be to anyone who might walk in, sent a shiver through her spine.