Coming back from a meeting in London, I was packed in to a crowded train on a sticky summer's evening.

The windows were open, but there wasn't enough breeze, and we were all glistening a little.

I was sat on one of the baggage shelves, and opposite me was a lesbian couple. They weren't canoodling or anything, just a single kiss at one point.

When one of them leant down to check her back however, her vest top gave way and gave me a very clear view of a nipple. Brown and large.

Made me smile for a moment in an otherwise unwelcoming environment.