Just finished my anatomy lab... studying the muscular system has me thinking about completely different kinds of muscle control. My mind keeps drifting to how good it feels when I'm riding someone's cock, clenching my pussy around them while they fill me deep. There's something so primal about watching my own body move, knowing exactly how tight I can make myself for them. Wish I had a study partner who'd let me practice my 'anatomy' on them tonight...