The way she trembled when she was brought before the window was quite an erotic squirming, legs rubbing together buttocks seeming to lift and lower a little at their own pace, her cheeks flushed. Yet the word spoken to her made her swallow and her hands slowly rose to tug her dress' collar a bit, unbuttoning a little of it. The prim and proper young lady embarrassedly exposed the perky breasts to the air, and facing the window. She drew a deep breath, shivering.<br/><br/>"W-what if someone sees?" She let out a shiver but her hand already touched her breast, her other hand loosening the dress a little, the hem of her skirt hanging over her bottom still. The pull had brought it to press against Petra though, those firm round cheeks a wriggling a bit against Petra's body, but her legs were a bit parted, as she swallowed.<br/><br/>"Wait... umm..." She swallowed again before embarrassed looking back. "C-could you<span class="bbc_size" style="font-size: 10pt;">spit on your fingers and rub there a bit first, maybe?</span><span class="bbc_size" style="font-size: 8pt;">I um, I got books that...</span>w-well I am sure you know better than I." She looked away all rosy on the cheeks but twisting a nipple a little and gasping lightly, another hand at her stomach unbuttoning the lowest button on that dress, the belt in her way from opening anything more.