That looks REALLY uncomfortable. I dont see that likely to get an orgasm going, she should do like I do. Lean back in the chair, skirt up, hand down the front of her panties and give her clitty a sweet little rub. Works for me a treat !
Oh dear! I don't think that would be comfortable at all; not that sexy to watch either. She wants to be careful too: if that chair were to slip from under her, she could do herself a nasty injury.