"Are you adventurous?" Sarah asked. She was crashing at my flat for the night with her friend Mary. We had met at at wedding several months before and had a great evening. Then, I had offered space at my flat for their trip up to town. They had done the sights. Mary had gone to sort their return tickets or something. Sarah had complained of a stiff neck so she was sat on a dining chair, in front of me, while I massaged he...