Yes, I do mean FF.
I was in the choir you see, and my voice had not settled down. The choirmaster was quite determined that I should not sing again until it had, and so I became an organ scholar which I really enjoyed. Lots of time to practice and the run of the place, really.
I used to play for and direct my own choir practices sometimes, we had a mixed gender choir with boys and girls.
One evening, after choir practice, I had stayed on a little longer to tidy up. Most of the choir had gone home and I treated myself to a trip up the tower. It is quite old, and there are little rooms, long forgotten on the way up. They are filled with all kinds of junk from old lecturns to music books, old decorations, you name it. One room was my secret place. I had an old overstuffed chair in it that I had moved from another room. Some books and, in a way it was a little study I guess. It also had a window that overlooked the huge churchyard beyond. (From time to time I would jack off up there, and once or twice when my parents were away, I even slept there overnight.)
This particular evening, I just wanted some time alone, so I had climbed that long rambling staircase, past the other four landings and little rooms to 'my place.' In there, with the small window slighty open, I could see the churchyard and that's when I saw them. Two girls from the choir. I won't name them, let's call them Sarah and Jessica. Sarah was standing up with her skirt around her waist and her panties near her knees, and her hand rubbing herself vigorously. Jessica was kneeling, watching intently every move that Sarah made. I could see that Sarah was bright red in the face and as I watched her knees buckled a little and I saw Jessica flinch and wipe something off her face. There was a discussion between them. Finally, Jessica let Sarah take her jeans down, and I saw Sarah take Jessica's hand and guide it first over her panties and then, tugging them down and off between her legs.
For a while the two girls touched together, then I saw Jessica's hand fall away and Sarah obviously brought Jess off. I could see Jessica's ass cheeks clenching and relaxing.
Of course, I had my own orgasm at the same time with them.
It wasn't the last time I saw the two of them in their 'secret garden' in the churchyard.