She is your sister

"Oh, I've got an idea," I thought to myself, my heart pounding in my chest as the door to my stall creaked open.

I waited for the right moment, then with the agility of a cat, I leaped to the ceiling, my hands finding a hold on the overhead pipes. In a swift, silent motion, I swung myself into the adjacent cubicle, my feet never touching the ground, my belongings clutched tightly to my chest.

"It just looks like something fell, so we'd better get back outside, and I'm a bit hungry so we'll go to the cafeteria later," Lydia's voice drifted through the air, tinged with nonchalance.

I heard footsteps retreating, and then silence enveloped the bathroom once more. I exhaled, a wave of relief washing over me. "I thought she was going to think I was spying on them," I murmured to myself as I climbed down and stepped out of the stall, my rucksack in hand.