Last week I went to see a friend in Peterborough and ended up coming back to London on a late train. It was pretty quiet in the carriage and I was reading my book - nothing rude - when I started to feel a bit horny. I looked at some stories on Lush, on my phone and the itch got worse. That feeling in my tummy of sexual excitement, that dampness in my knickers. The motion of the train didn't help and there were only one or...