Charm buffs!!!
OMG, first of all, Thank you!
Scaling Charm duration is awesome, better catch and kite capabilities. The mana reduction is neat, the cost would make it more forgiving to try and charm an enemy without burning through so much mana... But looking at Ahri's lack of true identity, leading towards that of a mage, she lack's control abilities! Shedding some cooldown off her E, along with keeping the charm duration and mana cost, would help her better kite, control and catch, in the long run. Currently a 12 second charm cooldown, why reduce its cooldown? So she can get the chance to charm more often? http://images6.fanpop.com/image/photos/36200000/Ahri-image-ahri-36281940-100-100.png