What an arrangement! It was my fault, really. I dared him to do it, and now my boyfriend had me on the verge of cumming, and it had only been an hour! There were still five hours left, and it was torture! He had a vibrating bullet right against my clit and he teased me unmercifully. I couldn't cum without permission, and the only alternative was to give in and let him take me somewhere on the train. Sometimes it's hard to remember why I chose to be a submissive!