In the middle of the lake! What was I thinking?

I got there very early to avoid spectators, but I might have been watched from behind a tree. There was a swimming lake just a pair of metres away and I got undressed in the middle of the field nearby and started right away. I fondled my breasts and then my hand wandered towards my trousers. I just have to seize an opportunity like this when there's no one around. So I pushed my swimming trunks to one side and off I went. :-D But I think I was being watched.