I continued to stare captivated as, with her free hand, Sophie peeled away the covers from her lap. She spread her legs wide, placing her hand on her thigh. I felt the anticipation building inside me as I watched her hand creep towards her panties. Finally her fingers arrived stroking gently up and down across Oscar's grumpy green face. I exhaled loudly as her fingers grazed across her mound once again, releasing a breath I didn't realise I had been holding.

Sophie turned towards me, catching me watching her. I blushed and looked away embarrassed, but when I looked back up I could see that Sophie was grinning back at...