Doing the "What Comes Naturally"

Saw these two flies hard at it on a window today at lunchtime. Originally there were three, but it was obviously too much for one of them (insect troilism?) and it flew off. Snapped a quick shot with the iPhone just to record the event, then went and got my Oly for a better shot. (Does that make me a dodgy voyeur?). This was the result. I hope I didn't put them off - I dont think I could.

365/133