I don't know why! I'm the only girl in the office, I do the ledgers and apart from my Dad there are two sales guys. I get caught flapping my knees about even in a skirt which means I expose my undies across the room at times!
Heh I used to work with a woman who did that knee-flapping thing sometimes. One very hot summer's day about fifteen years ago, she came into where a colleague and I were standing around discussing business. She sat down in front of us to join in the conversation, and then proceeded to do it whilst wearing the flimsiest semi-see-through billowy summer dress.
After about 30 seconds of watching her soft pale thighs gently meeting and parting, meeting and parting, with a hint of plain cotton white knickers visible tightly around her hips through her dress, the loose armholes following the motion and revealing the sides of her bra, her perfume wafting through the air on this hot sweaty scorcher of a day, we could take it no longer.
We both - hilariously almost at the same moment - ended up blurting out together a hesitant "Er... um... Emma... could you not... please..."
She looked puzzled, then realised, blushed, shut her legs and apologised, while blushing even more.
As you can tell, even after all this time it's a lovely memory.